got a 73 with a 10 bolt up front, which is leaking something fierce. need to know what is involved in replacing the seal and would also like to possibly replace the pinion bearing. The truck has some 350k on her but has been very well maintained. no noise out of the diffs but can't be fresh huh? just want to get her back on the road. can the pinion bearing be replaced without pulling the pinion and ring? Is it accessable by just dropping the drive shaft and going in? I have a couple repair manuals that suck a$$ and do not cover the these precious little items. please help. the longer this takes to get fixed the more I have to drive a dodge, I hope you guys understand.