Check out Yukon gears, axles and Yukon Duragrip positraction units. One good source is Randy's Ring and Pinion.
Avoid Auburn posi units, and stock GM Gov-Loc units from the 1980's. Factory Eaton posi units from the 70's are good if you can find one, but they can be worn out and need new clutches so watch for that if you do find one, as rebuilding it will add to the cost.
Last edited by ericnova72; 02-24-2011 at 08:32 PM.