Ring and PinionStreet Gear Differential Ring and PinionStreet Gear Differential Ring and Pinion; GM 8.875 in. [12 Bolt]; 3.55 Ratio; 3.07 to 3.73 Ratio Carrier;FEATURES:Ring And Pinion SetRichmond 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!