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Richmond Gear 4900151 3.55 Ratio Ring and Pinion Set GM 8.2 10-Bolt

(Chevrolet Camaro 1967-70, Impala 1964-72, Malibu 1964-67, Chevelle 1964-72, Caprice 1966-71, El Camino 1964-73, Monte Carlo 1970-72 + 11 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

4900151
5 reviews
Sale Price

$419.38

2 left at this price

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Usually delivered within 2 days

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Product Details

The Richmond Gear 4900151 is a 3.55:1 ratio ring and pinion gear set designed specifically for GM 8.2-inch (10-bolt) rear differentials. This precision-engineered gear set features a 39-tooth ring gear paired with an 11-tooth pinion, providing excellent balance between acceleration and highway cruising for street performance applications.

Key Specifications:

  • Gear Ratio: 3.55:1 (39-11 tooth configuration)
  • Application: GM 8.2" 10-bolt differential
  • Carrier Requirement: Fits 3.08:1 and numerically higher carriers
  • Pinion Diameter: 1.438 inches with 25-spline
  • Construction: Premium 8620 steel for exceptional strength
  • Part of Richmond's Street Gear series for performance and durability

Features and Benefits:

  • Precision-matched ring and pinion pair with matching identification numbers
  • Ground pinion threads for trouble-free installation
  • Advanced heat treatment process for improved gear strength and longevity
  • Engineered for reduced gear noise and smooth operation
  • Optimized tooth contact pattern for maximum power transfer
  • Backed by Richmond's 2-year/100,000-mile warranty

Richmond Gear has been the trusted choice of professional racers and performance enthusiasts for over 80 years. Each gear set is manufactured using state-of-the-art processes and rigorous quality control standards, ensuring the superior performance that has made Richmond products winners at the Daytona 500 and NHRA U.S. Nationals for decades. This gear set is ideal for classic GM muscle cars and performance builds requiring a reliable, high-quality differential upgrade.

Products specifications

Fits

Chevrolet Camaro 1967-70, Impala 1964-72, Malibu 1964-67, Chevelle 1964-72, Caprice 1966-71, El Camino 1964-73, Monte Carlo 1970-72, Nova 1964-67, 1969-72, Chevy II 1964-68, Bel Air 1964-72, Biscayne 1964-72, Brookwood 1969-72 + 6 more models

Calculator

Gear Ratio Calculator

Carrier Series

3

Cover Bolts

10

Installation Kit Included

No

Notes

3.08:1 or numerically higher carrier.

Pinion Gear Teeth

11

Pinion Shaft Diameter (in)

1.438 in.

Pinion Spline Count

25

Quantity

Sold as a set.

Ring and Pinion Ratio

3.55:1

Ring Gear Bolts

10

Ring Gear Diameter (in)

8.200 in.

Ring Gear Rotation

Standard

Ring Gear Teeth

39

Tool

Transmission Lookup

Ring Gear Material

8620 Steel

Ring Gear Tooth Quantity

39

Differential Case Design Type

GM 8.2

Pinion Shaft Diameter

1.438

Ring Gear Diameter

8.2

Cover Bolt Quantity

10

Ring and Pinion Gear Ratio

3.55

Ring Gear Bolt Quantity

10

Pinion Gear Tooth Quantity

11

Differential Carrier Break

3.08 and Higher

Prop 65

WARNING: Cancer - www.p65warnings.ca.gov

Position

Rear

Definitely the best price that I found for the part that I needed! Customer service was helpful and I got the piece FAST! Thank you so much!

Seller had the best price online for the item I wanted! Responded to emails within 24 hours as stated, and sent me my tracking info as soon as part shipped. Thanks Autoplicity!

Good

Best prices, fast shipping, and product as described. I would definitely recommend Autoplicity.

Ordered a Trac-Bar from Autoplicity, and didn't have any problems. WILL be back!

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