It came stock in 88-98 some where up there. But they will not work for jeeps. Dodges came with a NP231D, D is for Dodge. Jeeps came with NP231J, J is for Jeep. Same for Chevy.

 

Crazy is right, the 231d will not work in a jeep without some custom work done. It will bolt up right, but the input shaft may need to be changed out and the rear output shaft is smaller (even if the spline count is the same). When I put the 242j in my truck I had to use a jeep slip yoke and get it adapted to my driveshaft with a "crossover" u joint. Also, the jeep shift pattern is different, so you may need a custom shift plate made.

 

-5 speed swap

-5 lug conversion

-paint

-exhaust

-360 swap

-spray on bedliner

-HUGHES/EDELBROCK FI AIRGAP KIT

 

I am told I can do a 231 swap but I have to use the front half with my 249 back half. I once tried to do a 242 swap but broke the chain inside cause it was set for the 3.73 rears and I have 3.55. Now that I know about the half swaps. I've been looking for another one. Or find one that is geared for 3.55 rears.

 

Um... what??

The transfer case has absolutely nothing to with what axle gears you have!! As long as the front axle matches the rear axle, it doesn't matter the ratio.

As for the case halves, you need to do research on how transfer cases are put together, because that won't work.

 

Im told the front chunk is different on a D30 3.55 then on a D30 3.73 chunk and the ratio in the tcase are off. so using the back half with the front half of a 242 will correct the bind.

 

The Do-Able List
New Tires
New Grill and Bumpers
Gloss Black Paint
Window Tint
New Speakers

The Wish List (In My Dreams)
426 Hemi
Ram 2500 Front and Rear Axles
2" Lift
Black Paint
32" Tires

 

I'll say it again, the transfer case does not make up for any gear ratio differences. It is a 1:1 front output to rear output... the front driveshaft will spin one time for every one time the rear driveshaft spins.

If you are in 4hi, the front AND rear driveshafts spin 1 time per every 1 turn of the input shaft. If you are in 4lo, the front AND rear driveshafts spin 1 time for every 2.72 turns of the input shaft.

Seriously, if you don't want to take my word for it, call up a drivetrain shop and ask if you can get a transfer case geared for 3.55s... see how long it takes them to quit laughing.

 

Will be finished finished in the next year
New Headlights
2" lift
Bucket Seats
New Rear Bumper
Tonneau Cover
Fix sagging headliner and dents

DREAMS:
2WD to 4WD conversion
Automatic to Manual conversion
Coating the underbody
New 2 tone Black and Silver paint job

 

Respray
HID Lights
9" rear
shaker hood or on with a vent or scoop
Phantom Grill

If anyone can help out with the last 2 let me know or tell me where to look
samrex@hotmail.com