Originally Posted by Jeeperz Creeperz
What year ZJ?
1993-1996.5 used a special crush sleeve design pinion but it's not available in a 4.10 ratio. You'd have to use a CJ gear with the CJ outer pinion bearing and pinion preload shims.
I believe the only gear ratios available in the crush sleeve (OE) design are 3.55 and 3.73. For everything else you have to go the CJ gear route.
After 1996.5, the ZJ used a TJ style gear set (short pinion) with crush sleeve.
TJ gears will NOT work in a CJ.
CJ gears WILL work in a ZJ (1993-1996.5).
TJ gears WILL work in a ZJ (1996.5-1998)
Mine is a 96, so according to your stuff, the breakover year. I'll have to go see what month mine was born, and maybe take apart the front. Thanks for the info!