5.57 Ratio Richmond - Pro Gear Differential Ring and Pinion for 8.875 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!

79-0031-1_v1.jpg
79-0031-1_v2.jpg
79-0031-1_v3.jpg
RICHMOND_RP_BOX.jpg

Part number: 79-0031-1

5.57 Ratio Richmond - Pro Gear Differential Ring and Pinion for 8.875 in (12 Bolt)

Application notes:

  • For GM 8.875" (12 Bolt)
  • 5.57 Ratio
  • Pro Gear
  • 4.10 Ratio Carrier and Higher
  • Requires Notched Cross Pin 80-0269-1 For Ring Gear Clearance
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 3.90 and Higher
Differential Case Design Type GM 8.875
Pinion Gear Tooth Quantity 7
Pinion Shaft Diameter 1.625 in
Pinion Spline Count 30
Ring & Pinion Gear Ratio 5.57
Ring Gear Bolt Quantity 12
Ring Gear Diameter 8.875 in
Ring Gear Material 9310 Steel
Ring Gear Rotation Standard
Ring Gear Tooth Quantity 39
Title Differential Ring and Pinion
Warranty Time 2 Years or 100,000 Miles

Vehicle Applications

  • 1971 – 1972 Buick Centurion
  • 1965 – 1972 Buick Electra
  • 1971 – 1972 Buick Estate Wagon
  • 1970 – 1972 Buick GS
  • 1968 – 1969 Buick GS 350
  • 1968 – 1969 Buick GS 400
  • 1970 – 1972 Buick GS 455
  • 1965 – 1967 Buick Gran Sport
  • 1971 – 1972 Buick LeSabre
  • 1971 – 1972 Buick Skylark
  • 1965 – 1969 Buick Special
  • 1964 – 1972 Buick Sportwagon
  • 1965 – 1970 Chevrolet Bel Air
  • 1967 – 1972 Chevrolet Camaro
  • 1966 – 1972 Chevrolet Caprice
  • 1964 – 1973 Chevrolet Chevelle
  • 1965 – 1968 Chevrolet Chevy II
  • 1965 – 1972 Chevrolet El Camino
  • 1965 – 1972 Chevrolet Impala
  • 1965 – 1967 Chevrolet Malibu
  • 1970 – 1972 Chevrolet Monte Carlo
  • 1969 – 1972 Chevrolet Nova
  • 1971 – 1972 GMC Sprint
  • 1971 Oldsmobile 442
  • 1965 – 1972 Oldsmobile 98
  • 1971 – 1972 Oldsmobile Cutlass
  • 1971 – 1972 Oldsmobile Cutlass Supreme
  • 1967 – 1968 Oldsmobile Delmont 88
  • 1965 – 1972 Oldsmobile Delta 88
  • 1965 – 1972 Oldsmobile F85
  • 1965 – 1966 Oldsmobile Jetstar 88
  • 1965 Oldsmobile Jetstar I
  • 1965 – 1966 Oldsmobile Starfire
  • 1967 – 1972 Oldsmobile Vista Cruiser
  • 1968 – 1971 Pontiac Acadian
  • 1965 – 1972 Pontiac Bonneville
  • 1972 – 1973 Pontiac Bristol
  • 1965 – 1972 Pontiac Catalina
  • 1967 – 1970 Pontiac Executive
  • 1967 – 1972 Pontiac Firebird
  • 1965 – 1972 Pontiac GTO
  • 1970 – 1972 Pontiac Grand Prix
  • 1971 – 1972 Pontiac Grand Safari
  • 1971 – 1972 Pontiac Grandville
  • 1965 – 1972 Pontiac LeMans
  • 1970 Pontiac Tempest