i have a 99 cherokee and i found a 90 cheorkee 4x4 for about 500$ so i was going to convert my jeep to 4x4
and i was wondering if they have the same drive train

 

90's have the CAD style front axle, u might want to stay away from that

 

Not to mention a bunch of vaccum crap on the trans/transfer case, cable speedo and the 90 uses a two wire pick up for the CP sensor so the pick ups on the flywheel are different.

 

What's wrong with that axel

 

It has a vacuum disconnect that tries to mimic lockout hubs, so the passenger side axle is 2 pieces with a shift collar. I rocked a vac disco d30 for a while after my 4x4 conv. and the only issue i had were the smaller ujoints. The vac disco housing assembly is much stronger than newer models and its easy to swap out the seals and axle shafts to the modern x760's shafts.

The trans and tcase wont really work with a 99 tho

 

https://www.cherokeeforum.com/f51/fre...ss-91-a-38629/

a free fix to bypass the CAD front axle. 20 minutes time to do. i've done it and have so far not had any ill effects (yet)