yj compatible transfer cases?

[bogi]

My transfer case is bad. I took it apart and one of the forks is worn and broken, also the teeth on one of the gears.
I have found a few np 231 cases, one out of a 1990 4 cyl manual wrangler, one out of a tj, some Cherokee..etc on craigslist and Facebook.my question is which are compatible as bolt ins for my jeep?
I could buy one and cannibalize it to rebuild mine but it would be much easier to just bolt a new one in.
I've read that the input spline count varies and just wondering how much difference there is between years and models.

95 wrangler 4 cyl 5 speed.
Thank you in advance.

 

[Bounty__Hunter]

Variations include input spline count, input length, input bearing width, output seal type, output length, vacuum switch v/ light switch, front yoke type. Then there are internal variations that won't prevent you from bolting one in but will make a difference in strength.

If you want to be sure it'll bolt in make sure it's from a '87-'95 YJ 2.5L 5spd. Otherwise you can get the parts from almost any 231J and make yours work.

I rebuild 231's all the time and can help you along the way.

 

[carnuck]

Double check your tcase input is 21 spline and not 23 like later models.

 

[Bounty__Hunter]

21 spline came behind the 4cyl.

 

[bogi]

Thank you! Got it replaced and it seems to be working fine.Will be running it at the orv park tomorrow.