Kit contains a ring and pinion set, positraction unit, and installation parts

1964-1971 Oldsmobile 442 (Rear) (Note: GM 8.5 in. Rear; Oldsmobile & Pontiac; Gear and Install Kit Package; Includes 3.90 Ratio Gear Set, Master Install Kit, and 28 Spline Limited Slip Differential); 1968-1972 Oldsmobile Cutlass (Rear) (Note: GM 8.5 in. Rear; Oldsmobile & Pontiac; Gear and Install Kit Package; Includes 3.90 Ratio Gear Set, Master Install Kit, and 28 Spline Limited Slip Differential); 1965-1971 Pontiac GTO (Rear) (Note: GM 8.5 in. Rear; Oldsmobile & Pontiac; Gear and Install Kit Package; Includes 3.90 Ratio Gear Set, Master Install Kit, and 28 Spline Limited Slip Differential); 1965-1981 Pontiac Catalina (Rear) (Drive: RWD / Note: GM 8.5 in. Rear; Oldsmobile & Pontiac; Gear and Install Kit Package; Includes 3.90 Ratio Gear Set, Master Install Kit, and 28 Spline Limited Slip Differential); 1964-1972 Pontiac LeMans (Rear) (Note: GM 8.5 in. Rear; Oldsmobile & Pontiac; Gear and Install Kit Package; Includes 3.90 Ratio Gear Set, Master Install Kit, and 28 Spline Limited Slip Differential)