USA Standard Gear

GM 8.6 Differential Overhaul Kit

$217.89

SKU: ZK GM8.6

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

Description

The USA Standard Gear Master Overhaul Kit, model ZK GM8.6, is designed to provide all the essential components for a comprehensive differential overhaul for 1999-2008 GM 8.6-inch rear differentials. This kit simplifies the process by consolidating all required parts under a single part number, saving both time and money during installation. This includes carrier bearings and races, pinion bearings and races, a new pinion seal, a comprehensive shim kit for precise adjustments, ring gear bolts, a pinion nut, a crush sleeve, thread locker for secure assembly, and a marking compound with a brush for pattern analysis. The kit also includes a gasket for a reliable seal. The bearings and races used in this kit are sourced from Koyo, known for their quality and longevity in automotive applications. This overhaul kit is specifically engineered to fit 1999 through 2008 GM 8.6-inch differentials. Ensure your vehicle is equipped with this specific differential size for proper fitment. If you are unsure about your differential model, it is recommended to consult your vehicle's service manual or contact technical support.

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

BrandUSA Standard Gear
Part NumberZK GM8.6
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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