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Richmond Gear 6900581 Ring and Pinion Set 3.91 Ratio Chrysler 8.75

(Chrysler 300 1969-70, Town & Country 1969-74, Newport 1969-74, New Yorker 1969-74, Imperial 1969-74; Dodge Charger 1969-70, Challenger 1970-74 + 23 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

6900581
15 reviews
Sale Price

$307.98

3 left at this price

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Usually delivered within 2 days

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Product Details

The Richmond Gear 6900581 is a professional-grade ring and pinion gear set engineered for Chrysler 8.75-inch differentials with 489 casting. This high-performance gear set features a 3.91:1 ratio, making it ideal for street performance applications where improved acceleration and throttle response are desired.

Key Features:

  • 3.91:1 gear ratio for enhanced acceleration
  • Designed specifically for Chrysler 8.75-inch differential with 489 casting
  • Precision-manufactured using state-of-the-art CNC equipment for accuracy within .001 inches
  • Ground pinion threads ensure trouble-free installation
  • Special heat treatment process for superior strength and durability
  • Computer-controlled manufacturing from foundry through final heat treating
  • Backed by decades of proven performance in street and racing applications

Richmond Gear sets are manufactured to exacting tolerances using advanced computer-controlled processes that ensure consistent quality and reliability. Each gear set undergoes precision cutting and specialized heat treatment to deliver maximum strength and longevity. Richmond Gear has been the choice of professional racers and performance enthusiasts for decades, with proven success at venues from Daytona to the U.S. Nationals.

Products specifications

Fits

Chrysler 300 1969-70, Town & Country 1969-74, Newport 1969-74, New Yorker 1969-74, Imperial 1969-74; Dodge Charger 1969-70, Challenger 1970-74, Dart 1969-72, Coronet 1969-71, Polara 1969-73, D100 Pickup 1969-70, Monaco 1969-74 + 18 more models

Calculator

Gear Ratio Calculator

Cover Bolts

10

Installation Kit Included

No

Pinion Gear Teeth

11

Pinion Shaft Diameter (in)

1.875 in.

Pinion Spline Count

10

Quantity

Sold as a set.

Ring and Pinion Ratio

3.91:1

Ring Gear Bolts

12

Ring Gear Diameter (in)

8.750 in.

Ring Gear Rotation

Standard

Ring Gear Teeth

43

Tool

Transmission Lookup

Ring Gear Tooth Quantity

43

Ring Gear Diameter

8.75

Pinion Shaft Diameter

1.875

Ring Gear Bolt Quantity

12

Differential Case Design Type

Chrysler 8.75 (489)

Pinion Gear Tooth Quantity

11

Ring and Pinion Gear Ratio

3.91

Ring Gear Material

8620 Steel

Cover Bolt Quantity

Dropout

Prop 65

WARNING: Cancer - www.p65warnings.ca.gov

Position

Rear

Web Site is great

The items I ordered came in prior to the expected date and were correct

Fast and easy

Well ordering was ok but that the easy part actually getting the correct product & in timely matter we will see

Thank you for having the tires available that I've been looking for a long time at a very good price.

Happy with everything

Awsome

Good

Excellent experience with the Customer Service Representative. He was very courteous and knowledgeable about the products. Victor E. Sylvester

Easy to use and great price

Best prices I found online

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.

great selection of wares to compare and easy checkout

Very satisfied. Will definitely shop here again in the future when the need arises.

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