Richmond Gear ring and pinions are perfect for any vehicle where performance and durability matters. Made from first-run steel, never recycled material, Richmond ring and pinions handle the extreme torque from high horsepower engines. Extensive engineering, computer controlled heat treatment, superior strength, quality and the widest selection of racing gear ratios available, make Richmond Gear the clear winner! Winners Run Richmond!

Specifications:
  • Cover Bolt Quantity: 12
  • Differential Carrier Break: 2.93 to 3.23 Ratio
  • Differential Case Design Type: GM 8.5
  • Pinion Gear Tooth Quantity: 10
  • Pinion Shaft Diameter: 1.626 (Inch)
  • Pinion Spline Count: 27
  • Ring & Pinion Gear Ratio: 3.90
  • Ring Gear Bolt Quantity: 10
  • Ring Gear Diameter: 8.5 (Inch)
  • Ring Gear Material: 8620 Steel
  • Ring Gear Rotation: Standard
  • Ring Gear Tooth Quantity: 39
  • Taxonomy A: Differential LD
  • Taxonomy B: Ring and Pinion
  • Taxonomy C: GM 8.5
  • Taxonomy D: Rear
Fitment: 1964 – 1971 Oldsmobile 442 | 1968 – 1972 Oldsmobile Cutlass | 1968 – 1972 Oldsmobile Cutlass Supreme | 1965 – 1981 Pontiac Catalina | 1965 – 1971 Pontiac GTO | 1964 – 1972 Pontiac LeMans

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