7.25 posi??

Cerwin started the thread. (?)

You can get a sure grip unit from many palces. MoPar, Audurn, Eaton.
Ring and pinions from many places. Richmond, U.S.Gear, etc...
Installation kist from as many sources that sell the R & P gears.
MoPar still has the stock seals and small parts for the rear and a few upgraded parts.
Theres plenty out there for that rear. You'll not have a problem in finding parts.

Old vart is right about that 2.45 ring though. You'll need a new sure grip back there to do another ratio. But it's cheap and worth every penny.