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Richmond Gear 79-0099-1 Pro Gear Ring and Pinion Set 4.11 Ratio GM 12-Bolt

(Chevrolet Camaro 1967-72, Impala 1965-72, Malibu 1965-67, Chevelle 1964-73, Caprice 1966-72, El Camino 1965-72, Monte Carlo 1970-72 + 42 more models)

Part of: Richmond Gear PRO Gear Differential Ring and Pinion Sets

Other options in this family: Richmond Gear 7900171 Richmond Gear 7900801 Richmond Gear 7900431 Richmond Gear 7900451 Richmond Gear 7900791

Manufacturer

Picture for manufacturer Richmond Gear

Part Number

7900991
11 reviews
Sale Price

$533.70

3 left at this price

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Product Details

The Richmond Gear 79-0099-1 Pro Gear ring and pinion set features a 4.11:1 gear ratio designed specifically for GM 8.875" 12-bolt differentials. This gear set is engineered for race use only where hard launches and severe heat cycling occurs.

Professional Racing Construction:

Made from 9310 steel alloy, these gears are more malleable and resistant to breakage under harsh racing conditions. The design features an outstanding rotating weight reduction of up to 6 pounds, ground pinion threads for trouble-free installation, and special heat treatment for improved strength.

Key Specifications:

  • 37-tooth ring gear and 9-tooth pinion configuration
  • 1.625" pinion shaft diameter with 30-spline pinion
  • 12 ring gear bolts for secure installation
  • Designed for 4.10:1 and numerically higher series 4 carriers
  • Sold as a complete set

This professional-grade gear set is backed by Richmond's 2-year or 100,000-mile warranty and carries on the legacy of the Double Diamond brand that has been winning at tracks like Daytona 500 and the U.S. Nationals for decades.

Products specifications

Fits

Chevrolet Camaro 1967-72, Impala 1965-72, Malibu 1965-67, Chevelle 1964-73, Caprice 1966-72, El Camino 1965-72, Monte Carlo 1970-72, Nova 1969-72, Chevy II 1965-68, Bel Air 1965-70; Pontiac GTO 1965-72, Firebird 1967-72 + 37 more models

Calculator

Gear Ratio Calculator

Carrier Series

4

Cover Bolts

12

Installation Kit Included

No

Notes

3.90:1 or numerically higher ratio carrier.

Pinion Gear Teeth

9

Pinion Shaft Diameter (in)

1.625 in.

Pinion Spline Count

30

Quantity

Sold as a set.

Ring and Pinion Ratio

4.11:1

Ring Gear Bolts

12

Ring Gear Diameter (in)

8.875 in.

Ring Gear Rotation

Standard

Ring Gear Teeth

37

Tool

Transmission Lookup

Cover Bolt Quantity

12

Pinion Shaft Diameter

1.625

Ring Gear Diameter

8.875

Ring Gear Tooth Quantity

37

Differential Carrier Break

3.90 and Higher

Ring Gear Material

9310 Steel

Ring Gear Bolt Quantity

12

Ring and Pinion Gear Ratio

4.11

Differential Case Design Type

GM 8.875 Car

Pinion Gear Tooth Quantity

9

Position

Rear

Prop 65

WARNING: Cancer - www.p65warnings.ca.gov

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