Zumbrota Drivetrain

GM 8.5-HD Differential Master Overhaul Kit

$210.89

SKU: ZK GM8.5-HD

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 (ZK GM8.5-HD) is designed to provide all the necessary components for a comprehensive differential overhaul for the GM 8.5" rear end. You will also find a pinion seal, a complete shim kit for precise adjustments, ring gear bolts, pinion nut, crush sleeve, thread locker, and a marking compound with an applicator brush. A gasket is also provided to ensure a secure and leak-free seal. USA Standard Gear products are recognized for their reliability and are built to ensure your vehicle's differential is repaired for the long haul. This master overhaul kit simplifies the process by consolidating all required installation parts into a single part number, saving you time and money while guaranteeing you receive the exact components needed for your specific application. The kit is designed with the general installer and DIY customer in mind, offering unmatched reliability and assurance for a lasting repair.

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

Don’t gamble
on fit.

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 NumberZK GM8.5-HD
CategoryDrivetrain

We’re here — turning wrenches, just like you.

Call us, follow along, or come say hi.

(760) 282-4645 Instagram Google

Buy with Confidence

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.

View Full Return Policy

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.

View Full Shipping Policy