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Richmond Gear 6903221 Ring and Pinion Set 4.10:1 Ratio GM 7.5 10-Bolt

(Cadillac DeVille 1982-84, Fleetwood 1982-90, Brougham 1987-90; Chevrolet Camaro 1982-2002, S10 1982-2004, Impala 1977-85, 1994-96 + 55 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

6903221
4 reviews
Sale Price

$391.37

1 left at this price

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Product Details

The Richmond Gear 6903221 is a professional-grade ring and pinion gear set engineered for GM 7.5 and 7.625-inch 10-bolt rear differentials. This Street Gear set delivers a 4.10:1 gear ratio for improved acceleration and performance in street and mild racing applications.

Key Specifications:

  • Gear Ratio: 4.10:1
  • Ring Gear Teeth: 41
  • Pinion Gear Teeth: 10
  • Ring Gear Diameter: 7.5 inches
  • Pinion Spline Count: 27
  • Cover Bolts: 10
  • Ring Gear Bolts: 10
  • Carrier Series: 3 (requires 3.23:1 or numerically higher carrier)
  • Standard rotation

Richmond Quality Engineering:

  • Computer-controlled manufacturing with precision tolerances to 1/1000th of an inch
  • Special heat treatment for improved strength and durability
  • Ground pinion threads for trouble-free installation
  • Each set is a matched pair pre-run on gear testing machines
  • Factory-marked specifications for backlash and pinion depth included

Richmond Gear has been the choice of professional racers for over 80 years, with proven performance at the Daytona 500 and U.S. Nationals. Each gear set is manufactured from the foundry through heat treatment in state-of-the-art facilities, ensuring consistent quality and reliability. Sold as a complete matched set ready for installation.

Important Installation Notes: This gear set requires a Series 3 carrier (3.23:1 or numerically higher). Not for use on 1999 and newer F-body vehicles equipped with factory Torsen limited slip differential unless using a special split paddle block kit. Richmond does not recommend use with mini-spool applications.

Products specifications

Fits

Cadillac DeVille 1982-84, Fleetwood 1982-90, Brougham 1987-90; Chevrolet Camaro 1982-2002, S10 1982-2004, Impala 1977-85, 1994-96, Colorado 2004-13, Malibu 1973-83, Blazer 1995-2001, Caprice 1977-96, El Camino 1977-87 + 50 more models

Calculator

Gear Ratio Calculator

Carrier Series

3

Cover Bolts

10

Installation Kit Included

No

Notes

3.23:1 or numerically higher carrier. Not for use on 1999 and up F-bodies if it has the factory torsen positraction, unless you purchase a special split paddle block kit. Richmond does not recommend use with a mini-spool.

Pinion Gear Teeth

10

Pinion Shaft Diameter (in)

1.438 in.

Pinion Spline Count

27

Quantity

Sold as a set.

Ring and Pinion Ratio

4.10:1

Ring Gear Bolts

10

Ring Gear Diameter (in)

7.500 in.

Ring Gear Rotation

Standard

Ring Gear Teeth

41

Tool

Transmission Lookup

Ring Gear Diameter

7.5

Ring Gear Tooth Quantity

41

Ring Gear Material

8620 Steel

Differential Case Design Type

GM 7.5

Pinion Gear Tooth Quantity

10

Ring and Pinion Gear Ratio

4.10

Pinion Shaft Diameter

1.438

Cover Bolt Quantity

10

Ring Gear Bolt Quantity

10

Differential Carrier Break

3.23 and Higher

Differential Case Design Type

GM 7.6 IFS

Differential Case Design Type

GM 7.625

Prop 65

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I've worked easier sites, but overall fairly straitforward. Would buy from again.

Great transaction at a great price.

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