Originally Posted by Tmarros

I live in York, PA i just bought a np231 out of a 96 yesterday for $140 with 150k miles. Fluid came out red and when i spun the yolk i could hear the chain moving and it was smooth. Sounded good in all gears and the guy offered me $20 for my old one. I think i made out pretty well

Originally Posted by That Jeep Guy XJMJ

91 and older is one cut year..(21 spline) and the 92+ is the 2nd cut year..(23 spline) the only thing that changed in the 231 t-cases from 95-96 is the sealed tail housing... 95 and older is an open tail housing and 96-newer is a sealed tail housing. direct swap. a 242 tcase will work just the same.. but will need the shift linkage adjusted and the dash light won't read 4 part time is all. it will instead read 4 full time in both part and full time positions.

Originally Posted by DieselD

I thought the year split was -90 21 spline 91+ 23 spline. I hope so because I just put a sye in a 95 tcase to put in my 91... ****.

Originally Posted by Tmarros

I live in York, PA i just bought a np231 out of a 96 yesterday for $140 with 150k miles. Fluid came out red and when i spun the yolk i could hear the chain moving and it was smooth. Sounded good in all gears and the guy offered me $20 for my old one. I think i made out pretty well

Originally Posted by HudsonN

Sweet deal! Glad to hear you found one locally.

Sounds obvious but change the fluid anyways while you have it out. Invest in a stubby 9/16" ratcheting wrench if you don't have one.