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Richmond Gear 4901131 Ring and Pinion Set 3.73 Ratio GM 8.875 12-Bolt

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

Part of: Richmond Gear Excel Differential Ring and Pinion Set

Other options in this family: Richmond Gear F9411 Richmond Gear F88410 Richmond Gear 4900391 Richmond Gear 12BC373T Richmond Gear 6903041

Manufacturer

Picture for manufacturer Richmond Gear

Part Number

4901131
4 reviews
Sale Price

$338.47

3 left at this price

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Usually delivered within 2 days

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Product Details

The Richmond Gear 4901131 is a high-performance ring and pinion gear set designed for GM 8.875-inch 12-bolt rear differentials. This street gear set features a 3.73:1 gear ratio, providing an excellent balance between acceleration and highway cruising efficiency for street-driven vehicles.

Key Features:

  • 3.73:1 gear ratio optimized for street performance
  • Precision-manufactured from high-strength alloy steel for durability
  • Computer-controlled CNC machining ensures proper tooth contact and quiet operation
  • Heat-treated for maximum strength and longevity
  • Direct replacement for GM 8.875-inch 12-bolt applications
  • Includes matched ring and pinion gear set

Richmond Gear is known for producing quality aftermarket drivetrain components that meet or exceed OEM specifications. This ring and pinion set requires professional installation and a complete differential rebuild kit with new bearings, seals, and gear oil for proper setup. Proper installation with correct backlash and bearing preload settings is critical for performance and longevity.

Products specifications

Fits

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

Calculator

Gear Ratio Calculator

Carrier Series

3

Cover Bolts

12

Installation Kit Included

No

Notes

3.07:1-3.73:1 carrier.

Pinion Gear Teeth

12

Pinion Shaft Diameter (in)

1.625 in.

Pinion Spline Count

30

Quantity

Sold as a set.

Ring and Pinion Ratio

3.42:1

Ring Gear Bolts

12

Ring Gear Diameter (in)

8.875 in.

Ring Gear Rotation

Standard

Ring Gear Teeth

41

Tool

Transmission Lookup

Ring Gear Tooth Quantity

41

Cover Bolt Quantity

12

Ring and Pinion Gear Ratio

3.42

Differential Carrier Break

3.07 to 3.73

Differential Case Design Type

GM 8.875 Car

Pinion Gear Tooth Quantity

12

Ring Gear Bolt Quantity

12

Pinion Shaft Diameter

1.625

Ring Gear Diameter

8.875

Ring Gear Material

8620 Steel

Prop 65

WARNING: Cancer - www.p65warnings.ca.gov

Position

Rear

easy

Great transaction at a great price.

Super easy + best price on the web. Very pleased am I.

I am extremely satisfied with Autoplicity in terms of service, price, and shipping. I was shopping for a set of N-FAB step bars for my truck and was ready to purchase from Amazon when I decided to look around to see if there were better prices. I stumbled upon Autoplicity and was surprised to see their price on the bars. I checked with their online chat customer service to confirm that they would fit my truck and that the price was for a pair of the bars and not just one. (That's how low the price was!). I then placed my order and the bars arrived at my doorstep 3 days later! Autoplicity gets an A+ in my book and I'll definitely be coming back.

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