Make sure there are absolutely NO chips in any of the teeth on either the ring gear or the pinion. if they have chips... don't buy them.
'91 YJ. 4.0 TF999, D300 w/ 4:1, twin sticks. Chevy D44 front, 4.10's, spooled, Yukon 4340 shafts w/ super joints. Warn premium lock outs, High steer, ram assist. Dodge D60HD rear, 4.10's, welded, disc brakes. SOA front w/ RE 1.5" SOA leaf packs. Custom 4 link rear w/16" fox air shocks, stretched to 110". 38x12.5x15 TSLs on crager Nomads w/ DIY beadlocks. Tolly Fab Tube fenders, rocker gaurds, cage. 15gal stainless steel fuel tank.