What does a 3.89 gear ratio mean for my vehicle?

A 3.89 gear ratio means the driveshaft will turn approximately 3.89 times for every one full rotation of your rear wheels. This generally results in quicker acceleration from a stop compared to higher numerical ratios (like 3.00 or 3.50), but your engine will run at a higher RPM on the highway.

Does this ring and pinion set come with installation hardware?

This listing is for the ring and pinion gear set only. Installation typically requires additional components such as bearings, seals, and shims, which are sold separately.

What kind of testing do USA Standard Gear sets undergo?

USA Standard Gear sets receive rigorous in-house quality evaluation. This testing ensures that each set passes dimensional checks, material integrity assessments, and fitment testing before being released for sale.

Yukon Gear & Axle 3.89 Ratio Ring & Pinion Set ZG F9-389

Name: USA Standard Ring & Pinion Gear Set For Ford 9in in a 3.89 Ratio
Brand: Yukon Gear & Axle
Price: 350.89 USD
Availability: InStock

USA Standard Ring & Pinion Gear Set For Ford 9in in a 3.89 Ratio

$350.89

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Yukon Gear & Axle 3.89 ratio ring and pinion set for Ford 9" rears. Designed to exceed OEM specs for reliable performance.

Key Features

Fits Ford 9" rear ends.
Features a 3.89 gear ratio for improved acceleration.
USA Standard Gear sets are designed to exceed OEM specifications.
Undergo rigorous in-house quality evaluation for dimensional, material, and fitment testing.
Yukon Gear & Axle brand.

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Will this fit your vehicle?

Product Details

If you're rebuilding or upgrading the rear end in a classic Ford, changing the ring and pinion gears is a common step to get the right balance of acceleration and highway cruising. This USA Standard Gear set for the Ford 9-inch rear end features a 3.89 ratio, which offers a noticeable boost in acceleration compared to stock gearing, making it a popular choice for vehicles that see a lot of stop-and-go driving or are used for towing. These sets are built to go beyond original equipment specifications, meaning they're well-built for dependable service.

Yukon Gear & Axle puts these USA Standard sets through rigorous in-house testing. This ensures that every set meets strict standards for dimensions, material integrity, and proper fitment before it ever leaves the factory. The 3.89 ratio is a solid option for a wide range of classic Ford vehicles, from early Broncos and F-100 trucks to Mustangs and Galaxies, providing improved off-the-line performance without sacrificing too much highway drivability.