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4 Wheel Drive/SUVs/Wrangler Transfer Case replacement

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Expert: - 9/2/2004


Question
I have a '92 YJ 4.0 w/5spd and am looking for a used NP231 transfer case to replace the one in it now (collision damage). I found a good deal on a NP231 (23 spline) coming from a '92 XJ (Cherokee). The seller says it may need  to use the front yoke from the Wrangler's old TCase to work, but otherwise should bolt right in. He's checking to make sure the linkage is compatible.
Can you tell me if this XJ to YJ swap will work, and will I need to make other mods or changes?
Thanks,
Brad

Answer
Brad,

As far as I know, the transfer cases should be interchangeable.   Just to make sure, you could contact "Advance Adapters," as they should know.  The 231 transfer cases used with the 4.0 in your Jeep should have the 23 spline shaft also.  If the linkage is different in the XJ, you should be able to use your existing linkage.  The 231's out of a Jeep with the 4 cyl engine would have the 21 spline, but the planetary gear with the 21 spline can be swapped out if needed.

Advance Adapters, Inc.
P.O. Box 247
4320 Aerotech Center Way
Paso Robles, CA  93446-0247
1(800)350-2223
http://www.advanceadapters.com

Carl

4 Wheel Drive/SUVs

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Carl Brandt

Expertise

Will discuss suspensions, lifts, lockers along with tire suggestions. Trail ratings and possible requirements needed for specific type of trails. Safety equipment and what you should carry with you. Certified off-road instructor. I am not a mechanic, and 4-Wheeling is a hobby, so if I can't answer a technical question it is due to my mechanical knowledge being related to vehicles that I have owned, or have worked on. I do not have manuals on all vehicles.

Experience

40 plus years of 4 wheeling in a variety of vehicles. At the present time, my major off-road rig is a 94 Jeep Wrangler with a spring over and a 1 1/2" suspension lift. This gives me a total lift of 7" or so. I have lockers front and rear. I have removed the track bars, and sway bar for maximum articulation. I am running a stock 2.5 ltr 4 cylinder with a Jacobs ignition along with a cold air high flow filter. It has 4.56:1 gears with a Dodge NV4500 transmission along with a 3.8:1 Atlas II transfer case. This gives me a final ratio of 105:1 in low gear/low range. Other vehicles I own, are a 96 Ford F-250 with a 6" lift, posi rear end, 36" Hummer tires, 5 speed with a fuel injected 460 ci engine, an 87 Samurai with an 8" lift, Ford 9" rear end with a spool, Chevy Dana 44 front end with an electric locker, 5.88 gears, 16% reduction in high range and a 6.5:1 low range with 35" Baja Claws, and a stock 2003 Grand Cherokee Overland. Trails I have run are the Rubicon (10 times), Dusey Ershim, Fordyce Creek trail, McGrew trail, several trails in Moab, Utah along with local monthly runs.

Organizations
Lost Coast 4x4's Cal 4-Wheel Corva UFWDA Blue Ribbon Coalition

Education/Credentials
Certified off-road instructor - Certificates in engineering/electronics

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