My Account
My Garage
Shopping Cart

Shopping Cart

0 items in your Cart
View Cart
Subtotal
Track
My Order
MY GARAGE Select Vehicle
MY GARAGE

Richmond Gear 79-0004-1 Pro Gear Ring and Pinion Set Ford 9 Inch 3.70 Ratio

(Ford F-150 1975-86, Mustang 1965-73, Bronco 1966-86, Thunderbird 1955-79, Maverick 1970-77, Galaxie 500 1962-74, F-100 1975-83 + 22 more models)

Part of: Richmond Gear PRO Gear Differential Ring and Pinion Sets

Other options in this family: Richmond Gear 7900801 Richmond Gear 7900431 Richmond Gear 79-0002-1 Richmond Gear 79-0098-1 Richmond Gear 79-1389-1

Manufacturer

Picture for manufacturer Richmond Gear

Part Number

79-0004-1
5 reviews
Sale Price

$629.22

In Stock (5)

delivery box

Usually delivered within 2 days

free shipping

FREE SHIPPING

Check out with

ApplePay
Authorize Seller Badge
No Hassle Returns

No Hassle Returns

Live-in-stock inventory

Live-in-stock inventory

Fitment guaranteed

Fitment guaranteed

Product Details

The Richmond Gear 79-0004-1 Pro Gear Ring and Pinion Set is engineered specifically for Ford 9-inch differentials with a 3.70:1 gear ratio. This professional-grade gear set is designed for race-only applications where hard launches and severe heat cycling occur, making it ideal for serious drag racing and high-performance street applications.

Key Features:

  • 3.70:1 gear ratio with 37-tooth ring gear and 10-tooth pinion for optimal performance
  • Manufactured from 9310 steel alloy for superior strength and resistance to breakage under harsh racing conditions
  • Lightened design offers up to 6 pounds of rotating weight reduction for improved acceleration
  • Ground pinion threads to gage quality ensure trouble-free installation
  • Special heat treatment for enhanced strength and durability
  • 35-spline pinion with 1.513-inch shaft diameter for big pinion support
  • 9-inch ring gear diameter with 10-bolt configuration (dropout style)

Richmond Gear Pro Gear sets feature precision manufacturing with tolerances held to within 1/1000th of an inch, ensuring optimal gear mesh and quiet operation even under extreme conditions. The softer, more malleable 9310 steel alloy construction provides flexibility that resists breakage during severe shock loads common in racing applications. This gear set is sold complete as a matched ring and pinion pair and requires an installation kit (sold separately) for proper setup.

Products specifications

Fits

Ford F-150 1975-86, Mustang 1965-73, Bronco 1966-86, Thunderbird 1955-79, Maverick 1970-77, Galaxie 500 1962-74, F-100 1975-83, Fairlane 1957-70, Ranchero 1957-79, Torino 1968-76, Galaxie 1959-67, Gran Torino 1972-76 + 17 more models

Calculator

Gear Ratio Calculator

Cover Bolts

10

Installation Kit Included

No

Pinion Gear Teeth

10

Pinion Shaft Diameter (in)

1.501 in.

Pinion Spline Count

35

Quantity

Sold as a set.

Ring and Pinion Ratio

3.70:1

Ring Gear Bolts

10

Ring Gear Diameter (in)

9.000 in.

Ring Gear Rotation

Standard

Ring Gear Teeth

37

Tool

Transmission Lookup

Ring Gear Material

9310 Steel

Pinion Gear Tooth Quantity

10

Ring Gear Diameter

9

Ring Gear Bolt Quantity

10

Pinion Shaft Diameter

1.875

Differential Case Design Type

Ford 9

Ring and Pinion Gear Ratio

3.70

Ring Gear Tooth Quantity

37

Cover Bolt Quantity

Dropout

Prop 65

WARNING: Cancer - www.p65warnings.ca.gov

Position

Rear

Easy helpful website. Search for what you want...It gave me all the products quickly and broke it down very well into different choices.

easy check out, hope to get my item fast and buy more from you guys!

Good to go...

Very pleased with the service and quick shipping. Checked out through Amazon payments without any issues. Item ordred was the Hella Supertone Horns. Arrived in original box and packaging. Will not hesitate to order from Autoplicity in the future.

Great prices very fast shipping!!!

Share icon
Return Policy
Returns are easy at Autoplicity

Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy