American Axle & Manufacturing (OEM) ring and pinion sets are uniquely designed to match the requirements the OEM Ring & Pinion designated for your specific vehicle. All performance factors for the size and weight of the specific vehicle must be taken into account. Only original equipment quality components are guaranteed to meet the same specifications as the parts they replace. AAM components mean performance to the vehicle manufacturer's standards. The combination of materials, heat treating, and cut geometry allow for a gear set that has ten times the life of a non-OEM ring and pinion gear set. This Premium LSD provides aggressive yet smooth traction to give you the confidence & performance you need. Get longer life and better traction with the heavy duty Positraction. This unit uses a nodular case and forged 4320 internals for added strength along with composite clutches for high performance and long life. *Recommended Oil: Standard 80/90wt (Non-Synthetic) (With Posi Additive) Premium master install kit uses only the highest quality components including Koyo brand bearings. Included are carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush collar (if applicable), threadlock, marking compound, brush, and gasket or RTV silicone.