Zumbrota Drivetrain

3.90 Ratio Ring and Pinion Gear Set

$272.99

SKU: ZG T8-390-29

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 Toyota 8-inch differentials, featuring a 3.90 ratio to optimize performance for specific applications. Each set undergoes stringent in-house quality evaluation, covering dimensional accuracy, material integrity, and precise fitment testing to guarantee dependable operation. USA Standard Gear provides a standard one-year warranty on all Ring and Pinion Gear Sets, covering manufacturing defects. This commitment to quality ensures that you receive a product built to last, offering peace of mind for your drivetrain needs. The brand emphasizes rigorous testing to deliver products that meet demanding standards for both performance and longevity.

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

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandZumbrota Drivetrain
Part NumberZG T8-390-29
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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