If you have a power lok and not a track lok, and you find that it has the newer fiber clutch pack then try to find an all steel clutch pack. They last much longer than the fiber and take much more abuse. The steel clutch pack isn't being made by Dana anymore but they do show up on ebay sometimes (same as Dana 70 clutch pack BTW). Pretty easy to change out if you have a big dead blow to knock the diff back in.