how did it crack? on the bottom or around the bolt circle? there was a torque issue from popo on some where the ring gear bolts backed out and cracked the case. mine cracked on the bottom from jumping and landing on the gas. i welded mine up and had no issues but a leaking orange seal on the passenger side of the rear dff.

check my old post http://www.rzrforums.net/engine-driv...rear-diff.html