Mario23 the $700 that Chevr aulait talks about includes the installation kit which includes new bearings and seals and an okie bushing and torque tube ball kit ( seals shims etc ). I'm doing this at the moment. If you do decide to put in a 3.55 ring and pinion it make sense to renew all the bearings etc while its apart.
Good luck with it whichever route you decide to go.
Cheers
Bob
