3.90 Ratio Ring And Pinion For A Rear GM 8.5" (O Axle) Differential

Richmond Gear is the leading manufacturer of professional quality, high-performance drivetrain products. Our complete line of products ranges from high performance ring-and-pinion sets for serious street and racing applications to torque-hungry manual transmissions and components. Richmond Gear products have been winners both at the Daytona 500 and U.S. Nationals for decades. WINNERS RUN RICHMOND! Vehicle Specific

• 1964-1971 Oldsmobile 442
• 1964-1972 Pontiac LeMans
• 1965-1971 Pontiac GTO
• 1965-1981 Pontiac Catalina
• 1968-1972 Oldsmobile Cutlass
• 1968-1972 Oldsmobile Cutlass Supreme