What is the benefit of a 3.90 gear ratio?

A 3.90 gear ratio generally offers a good balance between highway fuel economy and improved acceleration or towing power compared to numerically lower stock ratios. It can also help bring cruising RPMs back down if you've installed larger tires.

Does this gear set come with installation hardware?

This listing is for the USA Standard Ring & Pinion gear set only. Installation typically requires additional components such as bearings, seals, and a master installation kit, which are sold separately.

How is the quality of USA Standard Gear sets?

USA Standard Gear sets are designed to exceed OEM specifications and undergo rigorous in-house quality evaluation. This testing ensures dimensional accuracy, material integrity, and proper fitment for dependable performance.

Yukon Gear & Axle Ring & Pinion 3.90 Ratio ZG F8.8-390

Name: USA Standard Ring & Pinion Gear Set For Ford 8.8in in a 3.90 Ratio
Brand: Yukon Gear & Axle
Price: 418.89 USD
Availability: InStock

USA Standard Ring & Pinion Gear Set For Ford 8.8in in a 3.90 Ratio

$418.89

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 USA Standard Ring & Pinion set for Ford 8.8" axles with a 3.90 ratio. Improves highway cruising and towing performance.

Key Features

Fits many Ford 8.8" axle applications.
Features a 3.90 gear ratio for improved highway cruising and towing.
Designed to exceed OEM specifications for reliable performance.
Undergoes rigorous in-house quality evaluation for dimensional accuracy, material integrity, and fitment.
Manufactured by Yukon Gear & Axle, a well-known name in drivetrain components.

Secure CheckoutFast Shipping631-982-0042

Will this fit your vehicle?

Product Details

If you're looking to change the gear ratio in your Ford 8.8" axle, a USA Standard Ring & Pinion set from Yukon Gear & Axle is a solid option. This set features a 3.90 ratio, which is a popular choice for balancing highway cruising comfort with improved towing and acceleration capabilities compared to stock gearing. It's designed to meet or exceed original equipment specifications, ensuring it performs reliably in a wide range of Ford vehicles.

Yukon Gear & Axle puts these USA Standard sets through rigorous in-house quality checks. This means they are tested for dimensions, material integrity, and proper fitment before they ever leave the factory. This attention to detail helps ensure a smooth installation and dependable operation once the gears are set up in your differential. A 3.90 ratio is often chosen by owners who want a bit more 'oomph' for hauling or towing, or for those who have upgraded to larger tires and need to bring their cruising RPMs back down to a more comfortable level.

This ring and pinion set is compatible with many Ford vehicles equipped with the 8.8" axle, including popular models like the Ford Bronco, Crown Victoria, E-Series vans, Expedition, Explorer, F-150, and Mustang. Proper installation is key for any gear set, so be sure to follow the manufacturer's instructions carefully, which typically involve setting backlash and gear pattern correctly.