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Differential Ring and Pinion (12 Bolt)

12BC373 Application Notes

Warranty

1 Year or 50,000 Miles

12BC373 Specifications

App Model GM 8.875 Car

Cover Bolt Quantity 12

Differential Carrier Break 3.90 Ratio and Higher

Differential Case Design Type GM 8.875 Car

Gear Ratio 3.73

Pinion Gear Tooth Quantity 11

Pinion Shaft Diameter 1.625 (Inch)

Pinion Spline Count 30

Ring Gear Bolt Quantity 12

Ring Gear Material 8620 Steel

Ring Gear Outside Diameter 8.875 (Inch)

Ring Gear Rotation Standard

Ring Gear Tooth Quantity 41

Taxonomy A LD Differential, LD Differential, LD Differential

Taxonomy B Ring and Pinion, Ring and Pinion, Ring and Pinion

Taxonomy C Rear, Rear, Rear

Taxonomy D 3.73, 3.73, 3.73

Where to buy

Vehicle Applications

1971 – 1972 Buick Centurion
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Buick Electra
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 – 1972 Buick Estate Wagon
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1970 – 1972 Buick GS
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1968 – 1969 Buick GS 350
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1968 – 1969 Buick GS 400
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1970 – 1972 Buick GS 455
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1967 Buick Gran Sport
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 – 1972 Buick LeSabre
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 – 1972 Buick Skylark
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1969 Buick Special
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1964 – 1972 Buick Sportwagon
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1970 Chevrolet Bel Air
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1967 – 1972 Chevrolet Camaro
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1966 – 1972 Chevrolet Caprice
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1964 – 1973 Chevrolet Chevelle
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1968 Chevrolet Chevy II
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Chevrolet El Camino
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Chevrolet Impala
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1967 Chevrolet Malibu
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1970 – 1972 Chevrolet Monte Carlo
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1969 – 1972 Chevrolet Nova
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1970 – 1972 Ford Royal
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 – 1972 GMC Sprint
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 Oldsmobile 442
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Oldsmobile 98
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 – 1972 Oldsmobile Cutlass
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 – 1972 Oldsmobile Cutlass Supreme
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1967 – 1968 Oldsmobile Delmont 88
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Oldsmobile Delta 88
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Oldsmobile F85
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1966 Oldsmobile Jetstar 88
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 Oldsmobile Jetstar I
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1966 Oldsmobile Starfire
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1967 – 1972 Oldsmobile Vista Cruiser
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1971 Pontiac Acadian
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1969 Pontiac Beaumont
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Pontiac Bonneville
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Pontiac Catalina
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1967 – 1970 Pontiac Executive
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1967 – 1968 Pontiac Firebird
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1969 Pontiac Firebird
1969 – 1970 Pontiac Firebird
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1970 – 1971 Pontiac Firebird
1971 Pontiac Firebird
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1972 Pontiac Firebird
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Pontiac GTO
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1970 – 1972 Pontiac Grand Prix
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 – 1972 Pontiac Grand Safari
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1971 – 1972 Pontiac Grandville
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Pontiac Laurentian
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Pontiac LeMans
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1972 Pontiac Parisienne
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1965 – 1970 Pontiac Strato-Chief
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier
1970 Pontiac Tempest
Application notes:
- For GM 8.875" (12 Bolt)
- 3.73 Ratio
- Thin Ring Gear
- Requires a 3.90 and Numerically Higher Ratio Carrier

Installation

Installation Instructions

⚠ WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov