3.42 Ratio Richmond - Street Gear Differential Ring and Pinion for 8.5 in (12 Bolt)

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!

49-0049-1_v1.jpg
49-0049-1_v2.jpg
49-0049-1_v3.jpg
49-0049-1_v4.jpg
RICHMOND_RP_BOX.jpg

Part number: 49-0049-1

3.42 Ratio Richmond - Street Gear Differential Ring and Pinion for 8.5 in (12 Bolt)

Application notes:

  • For GM 8.5" O Axle (12 Bolt)
  • 3.42 Ratio
  • Thick Gear
  • 2.93 to 3.23 Ratio Carrier
Where to buy

Downloads

Buying Guide

Search year, make and model to find applications for your vehicle.

Richmond Gear Buying Guide

Specifications

Cover Bolt Quantity 12
Differential Carrier Break 2.93 to 3.23
Differential Case Design Type GM 8.5 (O Axle)
Pinion Gear Tooth Quantity 12
Pinion Shaft Diameter 1.626 in
Pinion Spline Count 27
Ring & Pinion Gear Ratio 3.42
Ring Gear Bolt Quantity 10
Ring Gear Diameter 8.5 in
Ring Gear Material 8620 Steel
Ring Gear Rotation Standard
Ring Gear Tooth Quantity 41
Title Differential Ring and Pinion
Warranty Time 2 Years or 100,000 Miles

Vehicle Applications

  • 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