Home / Shop / Richmond Gear Pro Ring and Pinion Sets 79-0031-1 GM 8.875 in. (12-bolt) passenger car 5.57 Gears Gear, Pinion, 5.57:1 Ratio, GM, 12-Bolt Car, 4 Series, Set

Richmond Gear Pro Ring and Pinion Sets 79-0031-1 GM 8.875 in. (12-bolt) passenger car 5.57 Gears Gear, Pinion, 5.57:1 Ratio, GM, 12-Bolt Car, 4 Series, Set

SKU: RMG7900311

Ring and Pinion Gears

Richmond Gear

Richmond Gear Pro Ring and Pinion Sets 79-0031-1 GM 8.875 in. (12-bolt) passenger car 5.57 Gears Gear, Pinion, 5.57:1 Ratio, GM, 12-Bolt Car, 4 Series, Set

SKU: RMG7900311

Ring and Pinion Gears

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Description

Richmond Gear Pro Gear ring and pinion sets take it a step further. The gear sets are designed for race use only where hard launches and severe heat cycling occurs. They're made from a softer, more malleable 9310 steel alloy to be more resistant to breakage under harsh racing conditions. These gears feature an outstanding rotating weight loss of up to 6 pounds, ground pinion threads for trouble-free installation, and a special heat treatment for improved strength.

Part Type

5.57 12 Bolt GM Pass

Data: v4.2 - Upd: 2026-09-29 18:48:30

Specifications

Product Attributes - Brand: Richmond Gear
Product Attributes - Manufacturer's Part Number: 79-0031-1
Product Attributes - Part Type: Ring and Pinion Gears
Product Attributes - Product Line: Richmond Gear Pro Gear Ring and Pinion Sets
Product Attributes - UPC: 698231679241
Product Attributes - Differential Case Design Type: GM 8.875 in. (12-bolt), passenger car
Product Attributes - Ring and Pinion Ratio: 5.57:1
Product Attributes - Cover Bolts: 12
Product Attributes - Ring Gear Bolts: 12
Product Attributes - Pinion Spline Count: 30
Product Attributes - Carrier Series: 4
Product Attributes - Ring Gear Rotation: Standard
Product Attributes - Ring Gear Teeth: 39
Product Attributes - Pinion Gear Teeth: 7
Product Attributes - Ring Gear Diameter (in.): 8.875 in.
Product Attributes - Pinion Shaft Diameter (in.): 1.625 in.
Product Attributes - Installation Kit Included: No
Product Attributes - Cover Gasket Included: No
Product Attributes - Pinion Shims Included: No
Product Attributes - Carrier Shims Included: No
Product Attributes - Crush Sleeve Included: No
Product Attributes - Pinion Seal Included: No
Product Attributes - Pinion Nut Included: No
Product Attributes - Ring Gear Bolts Included: No
Product Attributes - Head Bearing Included: No
Product Attributes - Tail Bearing Included: No
Product Attributes - Carrier Bearings Included: No
Product Attributes - Axle Seals Included: No
Product Attributes - Axle Bearings Included: No
Product Attributes - Differential Cover Included: No
Product Attributes - Differential Oil Included: No
Product Attributes - Friction Modifier Included: No
Product Attributes - Installation DVD Included: No
Product Attributes - Quantity: Sold as a set.
Product Attributes - Notes: 4.10:1 or numerically higher carrier.

Reference Information

Brand Name/s	Richmond Gear
StreetFX SKU	rmg7900311
SFX Item ID	5501201
Supplier Item Code	5501201
Manufacturer SKU	7900311
Manufacturer UPC	698231679241
Alternative References	RIC79-0031-1, 12-Bolt

Compatibility

Application Data

Make	BUICK
Model	CENTURION
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	CENTURION
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	CENTURION
Submodel	BASE
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	CENTURION
Submodel	BASE
Beginning Year	1971
Ending Year	1972
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Engine VIN Code	U
Region	USA

Make	BUICK
Model	CENTURION
Submodel	BASE
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Engine VIN Code	T
Region	USA

Make	BUICK
Model	CENTURION
Submodel	BASE
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Engine VIN Code	V
Region	USA

Make	BUICK
Model	CENTURION
Submodel	BASE
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Engine VIN Code	W
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1968
Ending Year	1968
Engine Type	V8
Engine Size	7.0L/430
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.0
CID	430
CC	7047
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1969
Ending Year	1969
Engine Type	V8
Engine Size	7.0L/430
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.0
CID	430
CC	7047
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1970
Ending Year	1970
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1970
Ending Year	1970
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1970
Ending Year	1970
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1971
Ending Year	1972
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Engine VIN Code	U
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Engine VIN Code	T
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Engine VIN Code	V
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225
Beginning Year	1972
Ending Year	1972
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Engine VIN Code	W
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225 CUSTOM
Beginning Year	1968
Ending Year	1968
Engine Type	V8
Engine Size	7.0L/430
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.0
CID	430
CC	7047
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225 CUSTOM
Beginning Year	1969
Ending Year	1969
Engine Type	V8
Engine Size	7.0L/430
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.0
CID	430
CC	7047
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225 CUSTOM
Beginning Year	1970
Ending Year	1970
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225 CUSTOM
Beginning Year	1970
Ending Year	1970
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225 CUSTOM
Beginning Year	1970
Ending Year	1970
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

Make	BUICK
Model	ELECTRA
Submodel	225 CUSTOM
Beginning Year	1971
Ending Year	1971
Engine Type	V8
Engine Size	7.5L/455
Engine Family	BUICK V8 GAS
Axle Location	Rear
Liter	7.5
CID	455
CC	7456
Application Notes	Differential Ring and Pinion; 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
Region	USA

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Richmond Gear Pro Ring and Pinion Sets 79-0031-1 GM 8.875 in. (12-bolt) passenger car 5.57 Gears Gear, Pinion, 5.57:1 Ratio, GM, 12-Bolt Car, 4 Series, Set

Richmond Gear Pro Ring and Pinion Sets 79-0031-1 GM 8.875 in. (12-bolt) passenger car 5.57 Gears Gear, Pinion, 5.57:1 Ratio, GM, 12-Bolt Car, 4 Series, Set

Description

Part Type

Specifications

Reference Information

Compatibility

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