np231 doubler build This units fits all Jeeps 2003 to 2011 with the 42RLE automatic overdrive. 584 likes · 8 talking about this. Circuit diagrams How to Build a Voltage Doubler Circuit. 1972 Jeep Commando rock crawler - V8, 5spd, doubler, 1 tons, 40s *LOWERED PRICE* for sale: photos, technical specifications, description 72 bull nose commandoAMC 304 V8 with Howell EFI, DUI HEI distributor, mild cam, and serpentine belt. I am doing this in my XJ, so I will just high light the important info. This is a second set of gears that sit in front of the transfer case between the transfer case and transmission. 25" heims all around for suspension-7/8" heims for steering/panhard-1/4" DOM trackbar and steering stuff -1/8" thick front driveshaft 1/4" rear-1992 gm DRW 14 bolt rear axle 74" wms yukon grizzley locker-1978 ford f250 front dana 44, nitro shafts-1979 ford f350 steering box Once the cables and shifters were complete I needed to make the bracket to hold the cable so I could connect it to the transfer case. The conversion loss is the difference in power at the output of the frequency doubler (the second harmonic) compared to the power applied to the input (fundamental) in dB. Twin-Stick that NP205, here's how. 72:1 Has a 1410 rear yoke and a 1310 front ( couldnt fit 1410 with the shifters) With the AX-5 transmission, NP231 transfer case, and stock gears, the calculation for crawl ratio would be: (3. ( I will go with a doubler or crawl box of some sort) Plans: Keep a flat belly, stretch the frame/tub 15" to LJ length, lockers front and back, low crawl ratio at least 110:1, 40" tires +-, winch, alum armor, beadlocks and other stuff. It will also put the motor in the correct rpm range at 70mph for highway use. The 6 planet is the newer cut and i am 99% sure that when i rebuilt my NP231 i used a bearing for a 1994 which should have been the new cut. Doubler Options : NP231/NP231, NP231/D300 . Add Photo. i chose the np435 due to Re: NP231 doubler kits It's funny that they are released when Duffy is waiting for the output shafts to come back from being hardened. What I know: 23 spline input D&d machine doubler JB conversions HD input/outputs Stock ratios 2. 62:1, 2. 93. I had a 1987 Ford Bronco with an EFI 460, NP435, NP203/205 doubler, Front dana 60 Rear 14 bolt. Installation. Repair a small cut in the brake lines that happened when cutting bracketry off for the new doubler crossmember. sorry about them axles i forgot what side drop the tj's were, but im assuming this is why your asking this question. All 66-77 Broncos came with the Dana 20 transfer case. So after i pull my t-case im going to take (Photo of doubler linkage used by '4x4Junkie' - Photo by 4x4Junkie) (Shifter for the doubler right in front of the seat. 38 gears and a spool, still leaves for now.  From 1979 to 1995 Toyota used at least 12 different individual transfer case in Pickups and 4Runners. What is the spectrum at the output of a frequency doubler? A. So, I wanted to get everyone's opinion of the best All-IH powetrain for a dual purpose Scout - wheeling, working, camping and street? I am planning on Range Doubler C-7081GN Equipment Central; where?, build 1972 ??, 4 pictures, Japan, schematics, tubes, semiconductors, Service- or Lab Equipment Trail-Gear is a leading manufacture of off-road products for rock crawlers, racers, and trail enthusiasts with thousands of Toyota, Suzuki, and universal parts. 100% Price match . This reduction unit replaces the stock 42RLE tailhousing with a 6 gear planetary reduction box featuring a 2. We still offer our great quality products and are looking to add even more. This current design shaft was introduced in 1997. These two are then bolted to a 4wd section. -5. Build thread for OJ, my YJ. An illustrated drawing is provide below to assist you in parts identification, ordering and assembly. I've been reading your build lately and thinking I will soon need to build a more family friendly wheeler instead of the my 92 rcsb. Check tag located on rear of unit for model number. Replacement Parts: Advance Adapters Dodge NV4500 4WD with 23 Spline Output Shaft to 1966-77 Bronco Dana 20 Transfer Case Adapter Kit The reason the Np241D is pretty much a beefed up Np231D is because the Np231D is not like the original Np231! Np231s are found in Jeeps and other small 4x4s. It is aluminum, and you don't want it to leak, so it makes for a not-so DIY job for a lot of people. NP231 Box 4 Rocks Doubler NP241 with SYE Dana 60 front with 4. These can be found in all 1997-2006 jeep vehicles with a factory NP231 Transfer Case. 2011 Interior Upgrades. 5k Superwinch :drive: The problem I ran into I realized belatedly when I decided to go to a NP231 doubler setup was the transfer case shifters! No one makes them really for two NP231 setups. Welcome to Stazworks Extreme Offroad Jed's machining doublers. 2011 Exterior Upgrades. . Our Price: $23. The New Process 205 t-case is arguably the toughest case made which is why a lot of us have them in our rigs. If your willing to pay that much for a used transfer case you deserve to get ripped off. Fabrication & builders section. Full hydro steering from POS. Shifter modules can be added as needed. The NP231 was manufactured with left side drop output and has a low gear ratio of 2. And we are always looking forward to the next upgrade. Generally, transformers are there to step-up or step-down the voltage, but sometimes transformers are not feasible because of their size and cost. This kit features a new 1 3/8" spline rear output shaft, 356-T6 heat treated aluminum alloy tailhousing, 1310 c. 77 . Ideal for both diesel and gas pickup trucks and other vehicles with early Muncie SM465, SM420, M21 and or Borg Warner T10 transmissions. My Doubler build Offroad Fabrication. 72:1 low range from a np231, that beats the 2:1 from a 203. 00 The LoMax gear set has been designed to achieve maximum gear strength and the lowest possible reduction ratio for the Jeep Dana 300 transfer case. JB Custom Fabrication, JB Fab, JB Custom, twin-stick, triple-stick, stainless steel, transfer case shifters, d300, np205, np203, d20, doubler, cable shifters, After a re-build it let me down again during an annual trek to Paragon - frustrating and disappointing! It was time for a serious upgrade. I picked up 2 ford married 205s for 150$. So what i have sitting in the garage as of now . This will go behind a np241 doubler, so I need an entire ps NP205 with the round pattern/female input. This unit has 2WD and 4wd, combination of 2 high, 4 high, neutral and 4 low. Major components like input and output shafts and gears are available as well, but you will find that this kit has everything you need for preventative maintenance to make… Novak Conversions carries a wide array of conversion kits and accessories to perform Just about any GM, Buick, or AMC swap possible. In this video I start work on installing my NP231 doubler kit but run into some unexpected hiccups. Hey everyone it's been a while since I've posted anything but I thought I would share this because it looks like a good set-up! It's a NP231 doubler crawler box you can attach to a NP231/Dana300. In Fig. I havent broke the input ever on the 231, and i dont think ill break a 300. 0 with a blown ax-15 and an np231 dana 300 doubler. Well I figure I will finally start this build thread. Features: The RubiCrawler increases your available gear ratios. Progress Report. 5" triple rate springs to prevent the coils from dropping out (Remember, no coilover$ yet ). The discharged voltage will be twice the voltage at which the capacitors were charged. Jump to Latest Follow 1 - 10 of 10 Posts. com/custom-build/231-ford205-doubler-kit This is the ORIGINAL Gear Drive Transfer Case Bible created by Marlin Crawler back in the 90s. Box 4 rocks doubler with 2 np231's(we'll see how long the back one lasts) The Jeep NP231 is one of the most popular transfer cases, but it creates an extremely short rear driveshaft. Kit works for 205/203 doubler set-ups that have the selector shaft for the 203 clocked toward the 205 front output, or straight up. As for most of us it is an evolution. 38 and a Detroit, 4 link and SAW air shocks. Shifters for the transmission, np231 range box, and the Dana 300. $44. 3 The Voltage Roubles Figure 7. 5 rear, D60 front, bad cut 40s, 4link rear, Y-link front, full hydro steering, NP231/Dana24 doubler, and bunch a scrap metal Blessed Child of God, Blessed Husband of Awesome Wife and Family np231 doubler donor case. What is the NP231 Transfer Case. Since the early 80's, the model 231 has been used in many vehicles and is designated as follows: NP231C = GM S-10, S-15 trucks & Blazers 1983 - 1991, NP231D = Dodge midsize and fullsize trucks, NP231J 231/300 Doubler. 0 transfer case to NP231 adapter Summer 2012 Added 1999 Montero Sport PCM to 1997 ECM Harness Pin-Out Table Added Montero Sport Parts section to Picture Gallery Added Montero Sport PCM ECM Pin-Out Descriptions Updated Links section Updated Mitsubishi 3. Then you get to have fun with cutting tools. TC: np205 or np231. NP231 Transfer Case Drive Sprocket (97-02 I guess it would depend on A) What NP231 you use and if it uses the same position sensor as our NP(NV)241's (I believe the later model TJ ones did), and B) Does the doubler kit maintatin that selector cam and fork from the stock NP231. 6 - Tooth Shaft 540 R. XJ '97+ doors onto older cherokees=one piece windows and better mirrors . 5" OME HD springs and front Bilstein/rear Rancho shocks, Barricade 9500 winch, custom front and rear bumpers, 136 amp alternator, 35" Super Swamper LTBs. 5 inch barrel OD DANA SPICER 2-3-13051X Slip Yoke 1310 Series Fits JEEP NP231 Transfer case with LIVE SHAFT OUTPUT Jeep Wrangler (YJ) (1987-1993) w/ NP231 Transfer Case. It worked really well. M. A 1988 Jeep Wrangler YJ 4WD build by @marcustrusty. . I got even luckier when I found out that this doubler donor was a 23 spline short input shaft! While the HP-23 may provide the voltages by modifying the HV voltage doubler to a full wave rectifier, the HP-23 100% duty cycle current ratings fall short of the 425VDC 275ma required by the HW TBS-50. brent might know more about this i think he was re searching it for his bro a little while ago. ca Np231/np205 doubler the 231 is a Jeep, would I be able to use this? 93' 4dr Jimmy 4. Transfer Case: A mechanical device with the capability to send power to a front driving axle as well as a rear driving axle. Progress Report. The New Process 231 transfer case is one of the most common and durable transfer cases ever produced We've got a great selection of NP231 crawl boxes at 4WP that make it a heck of a lot easier for your vehicle to tackle even the toughest terrain. GET ONE BEFORE THE PRICE GOES UP IN February 2014!! DIY KITS NOW AVAILABLE FOR THE FOLLOWING: BW1350 BW1354 BW4405 BW1356 NP231 2. Would really like to find a 241 OR out of a rubicon for the 4:1 low range and then build a doubler out of my 233 to give me lots of gearing options. The NP231 was used in Chevrolet and GMC small pickups and Jeep. have a 99 4. Now for the teardown of the 231. Installation and Review by 4x4wire. My buddy tried a 5:1 on an auto and it was WAY too low so I know the 7. FRONT OUTPUT SHAFT OPTIONS AF26 26 SPLINE FRONT OUTPUT AF32 32 SPLINE FRONT OUTPUT. (3) Add To Cart. 5" 14 bolt rear with 4. Off-Road FSJ Tech. 4l60e with a 203 doubler is long in a 40. It works by pushing down or pulling up - Photo by 4x4Junkie) Extending The Shifter Fork: When Bray D did his doubler build, his shifter wasn't long enough and needed to be extended. These brackets are a DIY build-from-parts so I was able to save about 50 bux over prefab brackets. Our Price: $24. The Blackbox Series is NorthWest FabWorks premier line of shiftable, underdrive gearboxes. mad rooster on pirate 4x4 makes it, and its around 600 i believe. Beware of Imitations I was lucky enough to find a Box4rocks 23 spline kit second-hand that had not yet been installed and came with all the parts that would be needed from a donor NP231 to make the doubler. It is no longer a nice-to-have, but a must-have, and now is the time to double down on it. I've seen some home-brew doublers that keep the cam. This kit provides rock-crawling performance without affecting high range gears for daily drivers, or the trip to and from the back country. It was 6500lbs of trail weight and the body was really starting to tear a part. Save 15% Off Instantly - Hurry! Ends 12/31/20. The crawler has a NP231/241 doubler as well as custom 4-link front and rear- it will need to be completely custom. A China/India Doubler By Louis Navellier , Editor, Growth Investor Dec 7, 2006, 7:13 am EDT December 7, 2006 The greatest economic war the world has ever seen is headed your way, and there’s no It is also possible to use a NP208, NP231 and NP241 as the front portion of the double but it requires some aluminum welding and machining. When mine was in my 40 the driveshaft was barely longer than the stock slip yoke. Build a doubler circuit, like the one shown in Figure 7, use 2 diode 1N4007, a 100 km resistor as a load in the output (Remember that you need to measure the real value of the resistor for any required calculation), and two 47 uk capacitor. 56's and locker 10. (NP231/figure 8 NP205 Strong Box) (BW1354/1354 Strong Box with optional mount) /\ Transmission mating end of empty Strong Box DIY kit. A Model NP242 was also added for the full time 4WD models. This is the type (round) I need: Sm465 for sale. These transfer cases are part time four wheel drive with shift positions 4HI - 2HI - N - 4L. 92:1 TransferCase + 4. Fabricated & installed the crossmember for my AW4, doubler and NP231 in my 2006 TJ Wrangler . Joined Apr 29, 2004 · 2,267 Posts . In this project, we will show how to build a voltage doubler circuit. NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion: NP231 doubler without axle gears The only thing that you have a chance to fit in a wrangler is a np231 crawl box with a dana 300 (short tail housing) behind it. Take two capacitors of equal capacity and breakdown voltage, charge them in as they are connected in parallel, reconnect these charged capacitors in series. 2. Sharing is caring and that is the only way to keep our scene, our community alive. Coincidentally, this is the very same pedal that got me started building pedals and launched EQD. So in this tutorial, we are going to make “Voltage Doubler Circuit using 555 Timer IC” The heart of this circuit is a NE555 Timer IC. To build a dual transfer case, two reductions boxes are bolted back to back with a dual case adapter. yoke 1310CV Yoke AA compaired to Stock (other styles of yokes available), bearings, fastening hardware, and detailed instructions. 99. High Maintenance Jeep Build. (I will edit & fill this in more as i can to make it as complete as possible with part#'s, possibly including pictures also if i get around to it-LOL) Manual tranny swap into a 93-98 ZJ (This was done on my 95' 4. This red and silver tag offers some valuable information concerning the transfer case. See full list on clanbryce. 5L/AX-5/NP231 with SYE, Spartan locked Dana 30/Aussie locked Ford 8. - Jeep Cherokee fabrication and builders discussion, modifications, projects, how-to guides, and technical help. 1 gears. 72:1, with the doubler locked into low range my crawl ratio is 75. My plan is to build a D D Machine doubler using the existing 231 and adding a NP241C transfer case behind it. 2 exist the pulses in different points of circuit. You could build your own supply using the Hammond 378CX transformer. com Np231 to Ford Np205 DIY doubler kit For using the front planetary of a np231 to make a doubler t-case front of a Ford Np205 case that have a 31spline input. Without the doubler locked into low range my crawl ratio (without factoring in torque converter slippage) is 27. 5 inch barrel OD NP231 with 27 SPLINE rear output 1. High angle Drive Shafts. Been selling like hot cakes. TJ/LJ NP231 Extreme Short Shaft Kit The TJ/LJ NP231 Extreme Short Shaft Kit is what short-wheelbase Wrangler owners have been dreaming about for decades. 25" 4. The New Process 231 is the most popular chain driven transfer case to date. I needed 23 spline shafts for both. It can be adapted to a Dana 300 which has 4:1 options, or, of course, an atlas. - Voltage double schematic 7. It works by pushing down or pulling up – Photo by 4x4Junkie) Extending The Shifter Fork: When Bray D did his doubler build, his shifter wasn’t long enough and needed to be extended. Once the cables and shifters were complete I needed to make the bracket to hold the cable so I could connect it to the transfer case. The only problem I have had is getting the rear 35 spline ARB to hold-up. it is a pretty long setup but cost pretty much nothing if you have the transfer cases. 72) x (4. NAXJA Forums -::- North American XJ Association > NAXJA Unibody Jeep Technical Forums > Jeep Cherokee XJ (1984 - 2001) > Modified Tech Discussion: NP231 doubler without axle gears Outland 391867660 Slip Yoke Eliminator Kit for Wrangler (NP231), 1 Pack. J Cherokee NP231 Transfer Case Fire roads are an excellent way to get started off-roading, but primitive motor trails and slickrocks take the adventure to new heights. Shop Allstate Gear for BW1356 transfer case parts at cheap, public wholesale pricing. Place the doubler adapter on a flat surface as pictured above (gear side up), you may need to prop the adapter up above the ground a bit with a piece of wood etc. 231/300 Doubler build; NP231 Tech Thread (doubler, chain upgrade, 6-planetary upgrade) Pinion seal replacement; Brakes: Issues & flaws of the stock brakes; Brake Knuckle Divot/Groove Repair; Stu Off-Road Vanco brake install; Vanco Brake Install on NC4x4 forum; Vanco Brake kit knuckle strength; WJ Cross-over steering conversion by Divinitous Jesus Jannette & Jeeps! XJ Fanatic 02 Suburban 5. Ithe is currently installed in my 99XJ till I can install my atlas. Are you looking to put another NP231 in front of the 231 doubler? You won't stand a chance of fitting two NP231's in there. 5 rear, D60 front, bad cut 40s, 4link rear, Y-link front, full hydro steering, NP231/Dana24 doubler, and bunch a scrap metal as in a doubler? or replace the 231 with the 300? i think you can replace it with the 300. 88, SOA lift with 2. Custom Build 2 Speed Chart Custom Build Your Atlas 4 Speed Transfer Case 1. This model is chain driven. Several other companies make short and utra-short SYE kits as well. I believe these were only used 80-86 in Chevy trucks with th400s the th350s & sm465s had figure 8/racetrack patterns for the adapter. drop) and you can get parts anywhere. (Photo of doubler linkage used by ‘4x4Junkie’ – Photo by 4x4Junkie) (Shifter for the doubler right in front of the seat. Ali Mansour Photographer, Writer. Here's a comparison of the length difference between a stock slip-yoke 231 and the doubler kit w/D300: My last build was a never ending project and I have promised myself (and my kids) that if I do any major mods to this thing, it won't be out of use for more than a couple weeks at a time. Rear is a frod 9" with a 3 link. If we can build a decent database that gives a means to 'read' the tags at a glance then we can scan the racks in a salvage yard, grab a tranny & transfer case and go without having to check spline counts first. The NP231 transfer case was introduced in 1988 by New Process Gear for use in Chevy, Dodge, GMC and Jeep vehicles. Sm465 for sale. AX-15 5 speed transmissionBox4rocks np231/dana300 double transfer cases. Designed with the most current design shaft found in the New Process Gear NP231. basically all of those options are a reduction housing that holds a NP231/241 planetary (the Ecobox is a DIY kit where you use a donor case). XJ '97+ doors onto older cherokees = one piece windows and better mirrors. The "strong box" mounts between the AX-15 and NP231. This transfer case was manufactured by New Venture Gear. This frequency doubler uses one CMOS quad, two input NAND gate package type 4011. The NP231 was offered in Chevrolet, Dodge, GMC and Jeep. (4. 00 transmission rebuild for the Grand An absolutely mandatory off-road modification! Several companies also make 'crawl boxes' or 'doublers'. This is a cast aluminum transfer case. May work though. A company tried to build on naturally asperated and managed 250hp after $10,000 into the motor. This is a true, bolt-in doubler that couples to the stock Jeep transfer case or an existing Atlas transfer case. Rear axle is a Ford 9″ with ARB airlocker and 4. If you go with a D300 behind the doubler you might stand a chance. $271. These fixed yoke kits from Advance Adapters add 3 to 4 in. A voltage doubler circuit is a circuit in which the output voltage is double the amplitude of the input voltage. 7 NV3500 5spd/Std D44/9. I really liked the old doubler setup for both it's extreme compound-low and also for the number of gear selections available. The standard 231 weighs approximately 70 lbs. Ideal for both diesel and gas pickup trucks and other vehicles with early Muncie SM465, SM420, M21 and or Borg Warner T10 transmissions. 5” shorter than an ATLAS II. switch for this option. It's a little over 8" long and is indexable. The NP231 was manufactured with left side drop output and has a low gear ratio of 2. Np231 to Ford Np205 DIY doubler kit For using the front planetary of a np231 to make a doubler t-case front of a Ford Np205 case that have a 31spline input. gripguru · Registered. The frequency doubler proper consists of an inverter IC1B, two differentiating networks R1/C1, R2/C2 and NAND gate IC1A, IC1C and IC1D function as input and output buffers. • TJ Wrangler. The HV winding is 800VCT at 535ma and 6. /\ Transfer case mating end of Strong Box DIY kit, with output shaft installed. My rig pushes 420 ftlbs. Dana 60 front with 5. 93 $ 271. All pictures are as it sits now. The 205 is a part time 4WD case, meaning when it's in 2WD the front driveshaft will not receive power. Both strong but the 231 is just pretty much unbreakable under torque. 88s lockers frt/rr 35" ProComp Extreme MTs frt EPi 9k Superwinch rear LP 8. Instagram: https://www. 4. 72 low range. Version 2. You get the best of both worlds. P. Build Thread King. 3. Double R needs to grow to help save these horses from an untimely death at no fault of their own or their owners. -PSC steering w/ hydro assist-homebrew bumpers and other armor-Warn 12K winch Planning Cherokee Build Offroad What we are doing is a 350 TBI, 700R4, NP231. This is a tough thing to decide. Atlas II Transfer Case and Klune-V The Crown Automotive NP231 Master Rebuild Kit has all of the components that tend to wear out with continual use, such as bearing, seals and shift pads. 72 okay, this damn subject yet again, I have a 91 YJ, AX15 and NP231 on 33's, thinking about taking a mad rooster doubler kit, hacking up my existing NP231 coupling it with a passenger drop D300, and leaving my current 4. It uses the input shaft, bearing and planetary gear set from a donor NP231. 219″ width) U-Joints. Note:For NP-231 - Only for Transfer Case #s: 52097695, 52097893, 52097894, 520977526, 52097696, 53008210, 52098361, Jeep soon added the NP231 which replaced the Model 207 in 1987. Jeep Wrangler (YJ) (1994-1995) w/ NP231 Transfer Case; w/ 1310 (3. This thread is basically a build thread but I also need some help here. Stazworks is proud to offer the new Axle Tech Bolt On portal conversion. I message JB Custom Fabrication because I really like his products and he immediately messages me back and was able to put together the kit I needed for my build! Below you will find a detailed list of the NP205 Transfer Case parts that includes complete rebuilt Transfer Cases, bearing rebuild kits, gaskets, seals, small parts, individual bearing, forks and sliders, shafts, chain, sprockets and miscellaneous parts. The NP231 case came with a 21 spline input shaft and the NP241 came with a 27 spline. 46:1 = 4. This kit is also more than 3” shorter than a standard Slip Yoke Eliminator Kit and 1. You need to get the main shaft front the range case resplined so you can have it 31 spline for ford, 27 splin for chevy or 23 spline for jeep. Yeah, with the 2. 10) = 44:1 The TeraLow231 Kit from Tera Manufacturing comes complete with a new front case, oil seal, silicone and locktight. Then I bought a couple of fj60 h42 OP shafts from Georg and a Dodge np231 23-spl, wide bearing Input gear. 1 out of 5 stars 12. NV241-OR (from TJ Rubicon only)=near bolt in, 4:1 low range 4. 4:1 the NP231 doubler uses the front half of the first case (the range part, no chain) and then you woudl be able to mate it to any other case. New Process 205. Offroad Design – 203/205 Doubler Instructions 11 22. of torque through a doubler and I am running 40" tires on a 6,000lbs (3 tons of fun) rig. 4:1) and low/hi (2. I have used Bennys downtown Bristol. Check great and honest reviews! Shop TRYBE Optics Enhancer Scope Magnification Doubler w/ Tube Mount | Up to 23% Off 4. I purchased it built off pirate4x4. GEAR RATIO ATLAS4-20 ATLAS4-30 ATLAS4-38 ATLAS4-43 PAGE 6 (1:1 (1:1 (1:1 (1:1 / / / / Nov 24, 2016 - Explore Ricky Hayden's board "Transfer case" on Pinterest. See it’s never done, but it’s fun and we love the club and the members. Description Single stick cable shifter assembly for NP231 Optional knob shown Billet Style: Multiple mounting options, mounting brackets can be reconfigured for different levels of mounting. 56's and locker, factory disc brakes CV driveshafts front and rear 1†Body Lift pucks Steering gear box (drilled and tapped) Hydro assist ram and lines 2†wheel spacers (set of 4) 42x15x15 swampers on beadlocks. We stock a full line of Borg Warner 1356 transfer case parts and rebuild kits to get your 1987-1997 Ford back on the road. 6061-t6 aluminum adapter plates. to the rear driveline length on a YJ, and up to 6 in. you can get unbelievable ratios though, and its far cheaper then an atlas, or even putting a 4:1 kit in your np231, and your final low/low ratio comes out to be like 7:1 Np231 to Dana 300/np231/241 DIY doubler kit | FrogFab You can also do a 231/231 doubler and then put a SS SYE on the back of your 231. I did my math and low/low is too low (7. This is the part you need to convert your NP231 to 23 spline input. Compared to the NP203 and NP205, the light-weight cast aluminum housing of this transfer case is easier Fits Jeep NP231 transfer case with 27 spline rear output; Fits 27 spline automatic and manual transmissions; Barrel Diameter = 1. The adapter is 5. This kit includes everything you need to convert the rear output of the NP231 transfer case to a fixed-style yoke. This results in a better driveshaft angle, eliminated driveline vibrations, and a transfer case that's ideal for trail use. 1 which uses compression to increase system resources, allowing more applications to run. Available with 21 or 23 spline input and output gears. The TrailCreeper is ready to bolt onto the front of a top shift style, gear driven Toyota transfer case. v. 0L, 33's) then later in my Exploder, I twisted the output shaft off the M5OD R1HD (low mile 2002). 2011 Exterior Upgrades. / NP231 from CollinsBros Jeep. Billet Aluminum, CNC machined case, hard anodized black with stainless fasteners. Usage Drive lines need to be lengthened and shortened to account for the length difference of the doubler. 2 203/28 splines for 25$. Unique Woodworking, Decor, & Furniture Designs, With You in Mind I used an NP231 from a '01 Ram 1500 for the rear transfercase. The IC possesses an oscillation frequency ranging from 670 to Dynamic Dirt Doubler. Units are completely rebuilt and inspected. Optional Items: Part No. It is based around a classic hard-clipping gray box overdrive (subtle hint, huh), one of my all-time favorites. 10 gears in the axles. Last but not less important is your own contribution to our cause. Klune-V Wrangler install Article and Review What got us most excited about installing the Klune-V Extreme Underdrive was, in a word, OPTIONS. NOTE: Shown with optional billet knobs Our NP205 cable shifter with our 203 doubler kit stainless steel brackets and interfaces. PAGE 25. Built to last using the highest quality materials To build a doubler for $1600+ the kit would have to cost $1000 then a used 203 for $200+ and a used 205 for $200+ and the shifters for $200+ If your willing to pay that much for a used transfer case you deserve to get ripped off GM NP203 to Bronco Dana 20 build-up, (i might go with a granny 4-speed, SM 420 or SM465 later, but now the project is to use my TH350 with a factory adaptor to the gear reduction section of a NP203 and then build (have made) an adaptor to a Ford Bronco dana 20 why do this? 2. 0L select-trac Grand Cherokee with a 42re trans, dana 35 rear & LP30 front sitting on a 3. ’97+ mirrors are a direct bolt into older XJ's and allow you to fold them in on tight trails. 41:1 and this is with a street driven setup that happily runs 65 mph at 1750 rpm. 28:1 low range. I will probably go with a single exit- easier to repair as needed. Plan: I'll be putting a 2000 ALH in it with a t176 4 speed transmission and an np231/dana300 doubler. FREE Shipping. is ax15, np231 crawl box(box4rocks) mounted to a Dana300 with 4. Transfer case is a twin sticked Dana 300, with 4:1, doubled to an NP231. PRODUCT OVERVIEW. They were made for Chev, Dodge, Ford and IH from 1969 #MirrorFinishMonday turning out some more chromoly shafts for our NP231, NP233, Dana 300 doubler kits. 231 Short Shaft Kit: 545. Fits: • TJ Wrangler • LJ Wrangler Unlimited (long-wheelbase) • YJ Wrangler • XJ Cherokee. Toy: 97 ZJ, 10. One decent option is a 203-205 doubler as long This TJ/LJ | YJ | XJ NP231 Short Shaft Kit increases the rear driveshaft length by 4 inches, which eliminates the need for a Transfer Case Lowering Kit in most cases. 00. If something in my t The Tera Low231 conversion kit is the solution for providing Wranglers, Cherokees, and Comanches with low crawl ratios. 10 gears. . This voltage doubling effect is achieved through the use of capacitors. Using the planetaries from a NP231 as a doubler is not a bad idea, box4rocks and madrooster both offer them for $499. This adapter kit will allow you to adapt the GM SM465 4WD, 4 speed transmission to the Jeep NP231 transfer case. If you are active off-road, even if it's occasionally, your Jeep is taking a beating. 2020 has now made video creation a necessity. 303 stainless CNC machined parts. 72:1) is too high. Jeep NP231 Transfer Case Seal and Gasket Kit, TSK-231J. 3 out of 5 stars 10. Last fall I bought an engine and 4-spd from a 78 fj40. May 1, 2012. 72:1. (he's here in Poulsbo, WA) Next up is a NP208 and NV241 doublers. 5 comments Driveshaft and Driveline Parts > SLIP YOKES - For 4X4 Transfer Case > NP231 with 27 SPLINE rear output 1. . I just got the sun gear back from a local guy who does EDM for his day job and at home as well. Tons of them out there, they're driver's drop on most of them (some were pass. Search this site. how much room do you have? in a navigator we built for my buddy's uncle, he took the 208 cut off half the case where the front output shaft goes down, removed the chain, and used it like a reduction box and put a hanging 205 behind it. A 17 year project that now features tons, 40s, a doubler, ORIs and a front 3-link Np231/Dana 300 Doubler It’s been a fun budget build. There is also a RAM Doubler for Windows 3. Insure you utilize the tag information and visual identifiers to determine the correct model and variation for post SAS build specs-Np231-dana24 doubler-3/4" thick cromo lowers-1. Junk yards can be your best friend, if you like building things and have a limited budget. 34 low gear. Jeep Cherokee (XJ) (1987-1996) with 207 or NP-231 Transfer Case. 5 rear, D60 front, bad cut 40s, 4link rear, Y-link front, full hydro steering, NP231/Dana24 doubler, and bunch a scrap metal Blessed Child of God, Blessed Husband of Awesome Wife and Family . I twisted the shaft right off between the boxes. 8:1 was perfect on 37s with 5. • This kit must be used w/ a CV style (double cardan) driveshaft. Stretch the wheelbase a bit, Lower gearing. I will be using behind the NP231. NP231 Transfer Case Seal and Gasket Kit, Jeep, TSK-231J. My plan is to build a D D Machine doubler using the existing 231 and adding a NP241C transfer case behind it. There are 14 transfer case models for Chevy vehicles; however, each has multiple variations. Jeep NP231 Transfer Case Seal and Gasket Kit, TSK-231JA. 304 stainless laser cut parts. 9L(360ci), 47re, NP231, eventually 231/D300 doubler or Atlas-D60 front, 35 spline chromo inners, ARB locker, 5. 0L to 3. Jeep vehicles using the early NP231 can still use our kit, providing that the needle bearings are removed from the stock drive sprockets. 13s-D70 rear, welded, 5. Reply. My AA Atlas with a 3. 304 stainless laser cut parts. Have you ever wondered what is considered a Toyota RF1A Gear Driven Transfer Case? Well here is some information that might help you. I am using the DD machine doubler kit. FREE Shipping. NP231 Transfer Case Vacuum Switch Wiring Harness and NP207 fits Cherokee XJ. 4. We build a hybrid transfer case and answer the age old question of what's the easiest way to put fixed yokes in a Chevy S10. 25 in length and is made from strong 356 T-6 heat treated aluminum alloy. 3 2wd DD/Tow Rig Toy: 97 ZJ, 10. Fits:Jeep Wrangler (YJ) (1987-1995) with 207 or NP-231 Transfer Case. This is a true, bolt-in doubler that couples to the stock Jeep transfer case or an existing Atlas transfer case. Also includes a larger output bearing and rear housing. 0:1 x 2. It has 4 stock shift positions, 2WD Hi, 4WD Hi, Neutral, and 4WD Lo. :woot: Russ His-SASed 02 Dakota Quad Cab Sport 4x4 4. ’97+ mirrors are direct bolt in to older XJ's and allow you to fold them in on tight trails. No problems with the ARB in smaller lighter rigs. The NP231 is 4WD with manual shift. Double R Designs, LTD, King William, Virginia. The Gray Channel™ is a real “twofer” of an overdrive. SPLINES: With all of the variations in model numbers, the only variation that we see concerning transmission adaption is the size and tooth count of the transfer case input spline. NP231 Transfer Case Seal and Gasket Kit, Jeep, TSK-231JA. We are looking to purchase more land, and build a 15-20 horse stall barn with an indoor arena for on-site training and fundraisers. For a start, you can replace the three-satellite planetary gear with a 6-satellite from the NP241 box, because the 3-satellite can withstand 600 lb-ft (813 N-m or 82 kg-m) of torque, and the 6-satellite – 1,400 lb-ft (1898 N-m or 193 kg-m) . 6. 5x15 boggers, np 241 tcase, 52" front and 63" rear spring under a more roomier rig. 72 low range. 5” shorter than an ATLAS A transfer case crawl box and low gear set is a replacement for the low range of gearing needed for rock crawling and related off-roading. Shifters pivot on PTO Tractor Pumps Hydraulic are for all tractors with power take off with a shaft size 1 3/8 " Dia. One of the easiest ways to identify the NP231 is the metal tag located on the back of the transfer case. A lot of upgrades are made for the NP231, which can make from a good box a real monster of off-road. Downsides were it's weight and length. 60. I rotated my t-case clock-wise until I achieved a flat belly. These two are then bolted to a 4wd section. 1. As a matter of fact, you can find one of the largest selections of differential parts when you shop at 4WP, which includes the best brands at the best prices. Np231 to Ford np205 DIY doubler kit | FrogFab. A top selling Mac utility for many years which eventually was made obsolete as Apple improved their own virtual memory. Toy: 97 ZJ, 10. Subscribe. 5RE lift) ----- I personally cannot justify a $2000. I plan to sell my np231 with the SYE to help with the cost of the Box4Rocks and just use a junkyard np231. Now things can If you own a 21 spline NP231 and you want to swap in a 23 spline transmission, you can either look for a cheap 23 spline NP231 at the junk yard or go to your local Jeep Parts Dealer and order up a new input shaft part #5300-6085. TeraFlex makes the Low231 4. Heck, get one out of a Rubicon with the lower gears in it anyway. After much discussion we decided to Performance Built NP231 Transfer Case Sale. The unit has a 27 spline front output and utilizes a rear slip yoke. Resident Army Ranger , Navy Seal , Super-Warrior , Ninja !! 231/d300 Doubler 88 YJ 4. Part #2307 -- $750. 25 rear stearling with 5. The conversion loss will vary as a function of the power and frequency applied to the input of the doubler. 72:1. The adapter kit includes a adapter housing, new spud shaft, gaskets, seal, fastening hardware, and adapter instructions. Not only does the Extreme Short Shaft Kit improve on strength, but it also increases driveshaft length by up to 7” over a stock application. 21 Tooth Shaft 1000 RPM. here is the thread That a friend showed me on Pirate4x4. NP231 Transfer Case Assembly (91-02 2. 99. 0 Build 42 serial number. 0:1 kit as well as the short SYE and ultra-short SYE kits. FREE Shipping. 5L Jeep Wrangler YJ & TJ w/ Manual Transmission) $1,789. Jeep kits are also available using the NP231/241 planetary gears. The most notable differences between the Bronco Dana 20s are the early version 66-72 known as the T-shift with 2. 72 to 1. 2. Body/Exterior/Armor: 1. Front axle is a Dana 60 35 spline inner and outers with Yukon slugs 5. The TrailCreeper is ready to bolt onto the front of a top shift style, gear driven Toyota transfer case. through hardened 4340 chromoly splined shafts. Ratio Possibilities: The model NP231 transfer case is a compact, chain-driven transfer case manufactured by New Venture Gear (New Process Gear) in Syracuse, New York. 72:1 low range back to 1:1 for existing operation. All styles are a 2-speed plus neutral design, with a 1. Description 15-1000 -UNI-RAISE, Drivetrain Lifing Device 42R360 - CHRYSLER ATF+4 (Qty. 3 Vortec SAS 87 S10 Extended Cab 4x4, Middle Daughter, Future build likely. The Atlas 2 speed (left) in comparison to the NP231 (right) with a fixed yoke kit. I am selling my np231/Dana 300 doubler setup. 0L/AW4/NP231 SYE 36" Iroks, Warn 8274 ,Lunchbox Locked New Process (NP) 271 Transfer Case Looking for information on transfer cases found in fullsize Ford trucks? This page is dedicated to those cases and provides a list of vehicles, a list of cases that were found in them, and photos for reference. Simply connect two valves on one set of wires and control each valve separately from the controller. 1310 c/v driveline and 231 sye Kit . The Np231 case was a die cast aluminum 2 piece design. Klune-V 4:1 crawler bolted to the NP231 DHD transfer case. This tag indicates a 231J transfer case, with a part number of 52099211, a build date of 6-21-99 and a gear ratio of 2. We like to have our customers measure from the main part of the 231 t-case housing A. The Social Frog. This top loaded heavy-duty transmission has a cast iron case, and is 12” in length. Transfer Case: NP231 by lowrad Basically you take a NP231 and a D300 and put them together with a kit that consists of a block off plate, a clocking ring (for the D300) and a stub shaft that mates the two together. Here the plate is mocked up on the range box Front output cut off Then I carried the range box and plate to a local machine shop, and 50 bucks later it was welded up. To build a doubler for $1600+ the kit would have to cost $1000 then a used 203 for $200+ and a used 205 for $200+ and the shifters for $200+. Jeep used the Quadra-Trac in lieu of the Dana 20 transfer case behind Jeeps that used the TH 400 automatic transmission from 1973 to 1979 in CJ’s, Jeep Trucks and Cherokees. Typically mounted between the transmission and transfer case, the BlackBox is a gear reduction unit that has the ability to shift from a 2. This Heavy Duty Slip Yoke eliminator kit fits Jeep NP231 transfer cases. Does the NP231 and the 300 have the same mounting? Step 1: Select transmission from the drop down list or, if it's not in the list and you know the gear ratios of your transmission, enter them below. Bigger tires, some bad ass D60’s and maybe some ORI Air shocks. instagram . Highest I know of is 1000 wheel horse at 25lb of boost. 38 gears, 38. So really, the Np231D could be considered an Np241 when compared to the orginal 231s anyway. Keep in mind that the average person has absolutely no use for a transfer case doubler. Extreme Duty NV4500 transmission gears are hardened to prevent breaking. The second cable is not used currently. Any I've ever seen fail have been as a result of a rock, bottomed drive shaft or a busted poorly designed doubler crossmember (oops). 1993 Wrangler S 2. I have been through ALOT of parts for the ax15, but replacing parts is cheaper than buying a nv4500 outright. AX-15 5 speed transmissionBox4rocks np231/dana300 double transfer cases. RAM Doubler: The first product to combine compression with virtual memory. My 205 came with figure 8 pattern, It cost me 150$ to have the case punched out to the "big bearing" 32 spline input. The chassis is custom built, the suspension is true double triangulated 4 link both front and rear. Now based in a 32,000sq/ft shop with 6 employees, a cnc laser and pressbrake, and a well equipped machine shop; we are able to make 90% of our products in house. Transfer Case: NP231 When repairing or replacing a Chevy transfer case, it is essential that you correctly identify your transfer case. 0, AW4, NP231/Dana 300 Doubler, GM 60/70HD, 40" IROKs on H1s TaterTott is offline Quote Quick Reply post #13 of 16 Old 01-27 i plan on using a d300 when i build my doubler. 99 $ 44. Even though the joint venture ended in 2002 when GM sold it's 36% stake in the company to Daimler Chrysler, the Muncie plant continued to build NV4500 transmissions for Dodge to the 2005 model year and GM for the 2007 model year. Not much of a build up but here are some pics of the finished product. 2 Star Rating on 21 Reviews for TRYBE Optics Enhancer Scope Magnification Doubler w/ Tube Mount Free Gift + Free Shipping over $49. Frogfab. After much research, I ordered a 23 spline input shaft made for a Dodge NP241D and a 23 spline shaft out of another variation of NP231. The NP231 transfer case features a front driver's side output as well as a center line rear output. 13s-5" bastard lift-back-half with lots o' tube, possible rear 4-link and coilovers-37" MTRs on H2 wheels, eventually 42s w/ less lift. 5L 24v SOHC Engine Conversion Nice to see a recent update that the rig is still running. This reduction unit replaces the stock 42RLE tailhousing with a 6 gear planetary reduction box featuring a 2. People are doing 700+hp on stock bottom ends at 15-20lb of boost. (about 1 inch longer setup then the stock np231). You unbolt the the case and split it apart and this is what you see. Just for trucks or do you build the 231 doubler for Jeeps, etc. NP208/241 TRANSFER CASE DETAIL IDENTIFICATION: The New Process 208 is a chain-driven transfer case. Included in the kit - Np205 clocking ring - Np231 rear plate - Np231 side plate - New np231 shift rail - HD new chromoly coupler shaft - All hardware nedded Np231 to Dana 300 DIY doubler kit For using the front planetary of a np231 to make a doubler t-case front of a Dana300 or 231/241 case that have a 23spline input Included in the kit - Dana 300 clocking ring - Np231 rear plate - Np231 side plate - New np231 shift rail - HD new chromoly coupler shaft - All hardware nedded they are based very similar to the current np231 doubler kits out there. You should consider to submit your own serial numbers or share other files with the community just as someone else helped you with Battery Doubler 1. Updated 5th gear nut, and mainshaft to handle 5th gear problem. NP231 Transfer Case 4:1 Upgrade Low Range Fix. I installed an Advanced Adapters fixed yoke kit, NP241 6-pinion planetary, and long input shaft from a TJ. SUPPORT YOUR LOCAL 4x4 SHOP. The TeraFlex TJ: NP231 Extreme Short Shaft Kit is what short-wheelbase TJ Wrangler/Unlimited owners have been dreaming about for decades. 500 inches; Centerline to end of barrel = 5. 1972 Jeep Commando rock crawler - V8, 5spd, doubler, 1 tons, 40s *LOWERED PRICE* for sale: photos, technical specifications, description 72 bull nose commandoAMC 304 V8 with Howell EFI, DUI HEI distributor, mild cam, and serpentine belt. This should put my final drive ratio around 150:1 with the 4:10 gears in the axles. Built to last! Price is $1,850. This top loaded heavy-duty transmission has a cast iron case, and is 12” in length. RT Off-Road Heavy-Duty Rear Drive Shaft for the NP231 Slip Yoke Eliminator Kit . I'd like to see a 231 doubler/adapter anyway. Not only does the Extreme Short Shaft Kit improve on strength, but it also increases driveshaft length by up to 7” over a stock application. 303 stainless CNC machined parts. Available with 21 or 23 spline input and output gears. I decided that I wanted to take full advantage of the flex that this thing is going to have with the long arms so I went for some RockKrawler 5. 875 inches; The 598448 slip yoke is designed as a simple way to add a Double Cardan CV to the common Jeep NP231 transfer case without the expense of a slip yoke eliminator kit. you need a flip kit (d300 is pass side drop) the kit usually runs around 150, and the adapter kit. Transfer Case Cable Bushing The New Process 231 series transfer case started to be installed in Jeep, Dodge, and Chevrolet applications in 1987. The NP231 is 1:1 direct drive in high range, and use planetary reduction gears for low range with a ratio of 2. 4. A PTO Pump can be used to power Log splitter, Backhoe, Landscaping equipment Farm machinery, Hydraulic motors, Front end loader, wood splitter, Fence post driver High Maintenance Jeep Build. Transfer cases drive the front output shaft with either a geartrain or a flat Hyvo-type chain. The Np231 in the Rams is an enlarged and built up Np231 just so it can survive in the Ram. 4 Recommemded) 42R370 - 42RLE Transmission Filter 42R800 - RUBICRAWLER CONTROL MODULE 300474 - Rubber Front Output Yoke Washer A cross reference table is provided below to aid you in identification of your transfer case. The smaller diameter ring gear and thickness of it make for smaller locker options. It came out of 1994 Chevy Suburban with 87k miles. In my opinion, the really nice part about the NP231 is the availability of replacment parts from common autoparts stores like Napa, Checkers, AutoZone, Carquest, etc. Typically, these add a second gear range option multiplying the transfer case ratio by the 'crawl box' or 'doubler' ratio. I would like to have a purpose built buggy, but I have a '67 Scout 800 that I am going to try and do everything 'pretty good' with instead. This unit was utilized beginning in 1992. The second cable is not used currently. submitted 2 months ago by RustyAutoholicGarage to r/Jeep. IMO it's a much cleaner and higher value setup than the cut-case NP doublers that used to be common. For some reason it doesn't seem to be as popular now. includes the main plate, clocking ring with clocking every 6 degrees. "Tater2" - '91 2 door XJ. Doubler Options : NP231/NP231, NP231/D300. 2011 Interior Upgrades. 38s and a Detroit locker. To build a dual transfer case, two reductions boxes are bolted back to back with a dual case adapter. BODY PANELS AND PROTECTION . • LJ Wrangler Unlimited (long-wheelbase). That was in an rx7 using small block Chevy v8 mounts. 00:1 high range and a 2. Im running/sitting the 203/205, and I "think" im under 1K. It provides a true 4. Usually ships within 3 to 5 weeks. connecting shafts will be available in 21,23,27,31 and 32 spline. Specs are 14 bolt rear with 5. on a TJ. I have a 6 planet gear set for a NP231 that i plan on installing after i verify if it is the correct gear cut. https://www. DOUBLER allows you to quickly add new valves or bypass broken valve wires. frogfab. If 94/95 YJ has 1330 series U-Joint, D35YOKEUBK should be purchased. 23. 56 axles = Ultra Slow 4-Wheeling 1 42R706 KNOB- NP231 1 42R708 LEVER- TC NP231 * THESE ITEMS ARE ASSEMBLED AND ADJUSTED FOR THE INSTALLATION. Install the 15 fat needle bearings into the pocket in the Doubler shaft, use grease to hold the needles in place. With the doubler, I am looking for a short term solution to split the difference with 42" tires and the 4cylinder engine. 4WD carries TeraFlex, Trail Gear and Advance Adapters crawl boxes and low gear sets that offer proper ratios and various spline configurations. See more ideas about transfer case, jeep, jeep xj. . 4. 10 gears, front is a Ford Dana 44 with an ARB air locker and 4. if theirs a will theirs a way plus the 300 is much stronger. 8 @ 4. Search this site. 73 Mike W5RKL And so it begins. 3VAC at 6A. 13s and an AW4. The doubler adapter shaft is free to move forward and backwards, but the 231 input allows it to travel too far backwards. 77 . The Doubler uses an NP205 transfer case, which is a gear-driven transfer case with an iron housing and adds the gear reduction half of an NP203 transfer case in front of it. They did my old F250 and the exhaust on the ‘75 and I have had no issues. This was a very popular mod back around 2004-07 and there must have been 4-5 different places offering kits. GM power antennas replace your broken XJ's with little modification Quadra-Trac / BW 1305/1339: This Jeep transfer case built by Borg Warner is commonly referred to as the Quadra-Trac. Nice that someone's making a doubler anyway for it. 46 low gear, verses the J-shift which was used from 73-77 and has a 2. Where It All Started. Where It All Started. Q. (Shifter – Photo by Bray D) Thats part of the reason a np231 has a torque rqting of around 2000 ft lbs while the grand daddy 205 has a rating of about 1100 ft lbs. 93) x (2. In choosing a Trail-Creeper replacement transfer case it is important to understand the differences betw How to build a simple frequency doubler for hall effect water flow sensor? Sensor Design & Implementation: 26: May 12, 2019: Lowering the input frequency for a frequency doubler using a single 4069: Digital Design: 31: Apr 14, 2018: Frequency doubler - low frequency- square wave: Digital Design: 25: Mar 11, 2018: P: Frequency doubler for sine wave Here’s the build list… Titled 1951 Jeep CJ3A 3RZ engine, AW4 tranny, NWF Eco Box, Dana 300 with a 4-1 kit Triple Stick shifter. 6. This kit is also more than 3” shorter than a standard Slip Yoke Eliminator Kit and 1. FST has expanded under new ownership. 17. You also need to weld a small block-off plate in the remains of your NP231. Early NP231's on Jeeps with a vacuum front axle disconnect feature (as is usually evident by the presence of a vacuum switch on the NP231) did not have a true neutral disconnect when shifted into neutral. Discussion Starter • #1 • May 8 Based on this matrix, I chose the NP231 doubler from Behemoth Drivetrain. Included in the kit - Np205 clocking ring - Np231 rear plate - Np231 side plate Email. I'd like to swap the 78 D60 and 10. Feb 1, 2016 - ORD offers the Doubler 4:1 Dual Transfer case, combining NP205 and NP203 transfer cases for a 4:1 ratio low range for Blazer, Suburban, K5, GM Jimmy, Dodge and Ford off road, rock crawling, and fourwheeling. np231 doubler build