So far the Integy rear hubs have been working just fine. Course I don't examine them closely but they are holding up well and have not given me anything to complain about (other than not aligning the bearings all that close together).
You know, one of the easiest ways to take a lot of stress off the Savage drivetrain is to go center diff (this would totally solve your tranny issue
). This truck is still using Savage 25 ring and pinion gears, just with the hardened bevel gears and aluminum cup from the Savage X. It's using the Savage 25 stock bulks too!