Zumbrota Drivetrain

3.89 Ratio Ring and Pinion Gear Set

$299.89

SKU: ZG F9-389

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

The USA Standard Ring & Pinion gear set is engineered to enhance the performance of your Ford 9" rear differential by providing a 3.89 gear ratio. This set is specifically designed for applications requiring a 9.00" ring gear diameter, a 28-spline pinion, and uses 10 ring gear bolts for secure mounting. Constructed with durability in mind, this gear set is built to withstand demanding driving conditions. It is a direct fit for Ford 9" axle applications, offering a precise solution for differential upgrades or replacements. Compatibility is key for differential components. This specific gear set is intended for use with the Ford 9" axle. Always confirm your axle housing and existing gear specifications before installation to ensure proper fitment and performance. Professional installation is recommended for optimal results and to ensure the integrity of your drivetrain.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandZumbrota Drivetrain
Part NumberZG F9-389
CategoryDrivetrain

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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