Eaton Posi Differential 17 Spline 3.90 & Down Ring Gear Pinion Ratio Rear 8.2in

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 Eatonss limited-slip differential for their traction answers. And the fact is, Eatons Posi units are virtually bullet proof.This Part Fits: Year Make Model Submodel 1955-1958 Buick Century Base 1959-1962 Buick Electra 225 1959-1964 Buick Electra Base 1959-1964 Buick Estate Wagon Base 1959-1963 Buick Invicta Base 1959-1964 Buick LeSabre Base 1958 Buick Limited Base 1963-1964 Buick Riviera Base 1957 Buick Roadmaster 75 1955-1958 Buick Roadmaster Base 1961-1964 Buick Skylark Base 1955-1958,1961-1964 Buick Special Base 1961-196