Eaton Posi Limited-Slip Differential Eaton's fiber disk-based limited-slip differential with precision forged gears offers lifelong chatter-free operation is a favorite of muscle car, hot rod and mild off-roaders looking for improved traction at launch. This is the same unit that was standard on GM products in the 1960s and 1970s. Muscle cars, hot rods and mild off-road vehicles should look to Eaton's limited-slip differential for their traction answers. And the fact is, Eaton's Posi units are virtually bullet proof. * We're talking precision forged gears for high impact strength and durability. * Formula One race-bred carbon friction discs for lifelong, chatter-free operation. * A spring pre-load pack combined with a field proven, high performance cast iron case for unbelievable durability. More information about Eaton performance differential (click here)