Richmond Gear

Richmond Gear is the leading manufacturer of professional-quality, high performance ring and pinion sets. The superior quality of these gear sets is the result of years of racing development, outstanding design, and state-of-the-art manufacturing methods.

Master Install Kit

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. 

Application: 1968-1972 Oldsmobile Cutlass 12 Bolt 8.5" Rearend

Rear Cover Bolts: 12

Ring Gear Bolts: 10

Compatible carrier:  3.08-3.23

Compatible Axles: 31 Spline

Package Includes       

1- GM 8.5" Olds 3.90 Richmond Ring and Pinion Set

1- GM 8.5" Olds Master Install Kit