The Eaton Posi limited-slip differential prevents wheel slip before it can get started. To do that, carbon disc clutch packs, preloaded by a central spring assembly, are located behind each differential side gear. When torque input increases the clamping load on the clutch packs increases. That causes the chatter-free clutch packs to grab and transfer power to the other wheel. 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. ​

Application: 1965-1971 GM 8.2" Buick/Olds/Pontiac 10 bolt Rearend (will not fit Buick GS) (will not fit Olds "O" axle with 12 bolt cover) (will not fit full size models)

Compatible gear ratios: 3.31-4.56

Axle Spline: 28