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Richmond Gear 79-0072-1 Pro Gear Ring and Pinion Set 4.56:1 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

7900721
4 reviews
Sale Price

$461.48

In Stock (5)

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Product Details

The Richmond Gear 79-0072-1 Pro Gear Ring and Pinion Set is engineered specifically for racing applications where hard launches and severe heat cycling occur. This gear set features a 4.56:1 ratio and is designed for GM 8.875" (12-bolt) passenger car differentials.

Race-Ready Construction:

Manufactured from 9310 steel alloy, this Pro Gear set is engineered to be more resistant to breakage under harsh racing conditions. The set includes a 41-tooth ring gear and 9-tooth pinion with a 1.625" pinion shaft diameter and 30-spline pinion design.

Performance Features:

  • Up to 6 pounds of rotating weight reduction for improved acceleration
  • Ground pinion threads for trouble-free installation
  • Special heat treatment for enhanced strength and durability
  • Professional-grade precision manufacturing for reliable performance

Installation Requirements:

This gear set requires a 3.90 or numerically higher ratio differential carrier for proper installation. Backed by a 2-year or 100,000-mile warranty, this Pro Gear set delivers the performance and reliability demanded by serious racers. The Richmond Gear Double Diamond trademark has represented the highest quality in racing gears for over 80 years.

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

4.56:1

Ring Gear Bolts

12

Ring Gear Diameter (in)

8.875 in.

Ring Gear Rotation

Standard

Ring Gear Teeth

41

Tool

Transmission Lookup

Pinion Gear Tooth Quantity

9

Differential Case Design Type

GM 8.875 Car

Ring and Pinion Gear Ratio

4.56

Ring Gear Diameter

8.875

Ring Gear Tooth Quantity

41

Differential Carrier Break

3.90 and Higher

Ring Gear Material

9310 Steel

Cover Bolt Quantity

12

Pinion Shaft Diameter

1.625

Ring Gear Bolt Quantity

12

Position

Rear

Prop 65

WARNING: Cancer - www.p65warnings.ca.gov

Great experience overall!!

Lowest price on the INTERNET!!! I searched for days and nobody could even come close to their price. They provided excellent feedback on my order status including shipping and tracking numbers.

Fast shipping and great prices. Amazon Payments was a breeze to use.

PART CAME IN FAST!!! Can't wait to tear it open

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