I have a 1990 4 door xj. 4.0 l 5 spd NP231 T-Case. I have put fullsize dana 44 and ford 9 underneath it. They have 4.56 gears and rear has full spool and front has detroit locker. I have put the rusty 4.5 inch lift with full leafs. I have 33x14 cut boggers. Bought them new and have maybe 12 times on them NO road miles. Have plenty of pics and any questions just ask. 317 412 2120 travis