Eaton Posi Differential 28 Spline 1.20in Axle Shaft Diameter 2.73 & Up Ratio Front/Rear 8.5inThe 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