Zumbrota Drivetrain

3.90 Ratio Ring & Pinion Gear Set

$392.89

SKU: ZG C8.89-390

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 for Chrysler 8.75" differentials, specifically those with the "89" housing. This set offers a 3.90 gear ratio, providing a balance for various driving conditions. It is constructed with an 8.75" ring gear diameter and features a 29 spline pinion and 12 ring gear bolts, ensuring robust performance and reliability. Crafted by USA Standard Gear, this component is a direct fit for Chrysler 8.75" "89" case housings. Key specifications include a 3.90 ratio, 29 spline count, and 12 ring gear bolts, all contributing to the precise operation of your differential. The product's proxy number is 36016. This gear set is suitable for rebuilds and upgrades where a 3.90 ratio is desired. Zumbrota Drivetrain offers technical support via phone and online chat to assist with fitment questions and build project selection. For purchasing, a low stock alert indicates only one unit is currently available.

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 C8.89-390
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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