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Motive Gear F9-389 Ring and Pinion Gear Set 3.89 Ratio Ford 9 Inch

(Ford F-150 1975-86, Mustang 1965-73, Bronco 1966-86, Thunderbird 1955-79, Maverick 1969-77, Galaxie 500 1962-74, F-100 1975-83 + 23 more models)

Part of: Motive Gear Differential Ring and Pinion Gear Sets

Other options in this family: Motive Gear D60-410 Motive Gear D35-355 Motive Gear D35-456 Motive Gear GM10-5-373 Motive Gear F8-8-410

Manufacturer

Picture for manufacturer Motive Gear

Part Number

F9-389
7 reviews
Sale Price

$304.38

1 left at this price

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Usually delivered within 2 days

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Product Details

The Motive Gear F9-389 ring and pinion gear set delivers a 3.89:1 gear ratio for Ford 9-inch rear differentials. This performance gear set is engineered for both street and off-road applications, providing the ideal balance between acceleration and highway drivability.

Key Features:

  • 3.89:1 gear ratio optimized for improved acceleration and performance
  • Precision-manufactured using state-of-the-art CNC machining processes
  • Heat-treated alloy steel construction for maximum strength and durability
  • Designed for Ford 9-inch rear axle housings
  • Lapped gear tooth surfaces ensure quiet operation and extended life
  • Extensively tested to meet demanding racing and off-road conditions
  • Includes ring gear bolts for complete installation

Motive Gear ring and pinion sets are developed through years of racing experience and rigorous in-house engineering testing. Each gear set is manufactured to OEM specifications or better, making them suitable for daily drivers, tow vehicles, and high-performance applications. Professional installation and proper setup with new bearings and seals is recommended for optimal performance and longevity.

Products specifications

Fits

Ford F-150 1975-86, Mustang 1965-73, Bronco 1966-86, Thunderbird 1955-79, Maverick 1969-77, Galaxie 500 1962-74, F-100 1975-83, Fairlane 1957-70, Ranchero 1957-79, Torino 1968-76, Galaxie 1959-67, Gran Torino 1972-76 + 18 more models

Pinion Spline Count

28

Ring Gear Rotation

Standard

Pinion Shaft Diameter

1.313

Ring Gear Bolt Quantity

10

Ring and Pinion Gear Ratio

3.89

Ring Gear Tooth Quantity

35

Ring Gear Material

8620 Steel

Ring Gear Diameter

9

Pinion Gear Tooth Quantity

9

Prop 65

Cancer and Reproductive Harm - www.P65Warnings.ca.gov
WARNING: Cancer - www.p65warnings.ca.gov

Cover Bolt Quantity

Dropout

Differential Case Design Type

Ford 9

Position

Rear

Very satisfied with this company. Ordered the part from another company and had nothing but problems. We found this place and the part was cheaper and they delivered the right part! Will do busy with again.

Very happy with my purchase. SUPER fast shipping and great communication. Will use again!

Really good prices and fast delivery.

Looking for this

Very easy to talk to on the phone and excellent service.

Lowest prices and fast shipping made this a great transaction.

A+ part as advertised, quick shipping.

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