Drivetrain› Differentials and Rear-End Components

USA Standard Gear

Rear Differential Master Bearing and Service Kit

$417.78

SKU: ZK GM11.5

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Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

The USA Standard Gear ZK GM11.5 is a master rear differential bearing and service kit designed for repairing AAM 11.5 rear axles. It is recommended for use during gear swaps or the installation of lockers and traction devices. This kit utilizes Koyo bearings and races.

The kit includes carrier bearings and races, pinion bearings and races, a pinion seal, a complete shim kit, ring gear bolts, a pinion nut, crush sleeve (if applicable), oil baffles and slingers (if applicable), thread locker, marking compound with brush, and a gasket. It is designed for 2001-2010 GM/Duramax and 2003-2010 Dodge/Cummins applications.
Show original supplier description
The USA Standard Gear ZK GM11.5 Master Overhaul Kit offers a comprehensive solution for repairing or servicing AAM 11.5 rear differentials. This kit is ideal for situations involving gear swaps or the installation of aftermarket lockers and traction devices, ensuring all necessary components are readily available. The included components are: carrier bearings and races, pinion bearings and races, a pinion seal, a complete shim kit for precise gear setup, ring gear bolts, a pinion nut, a crush sleeve (where applicable), oil baffles and slingers (where applicable), thread locking compound for secure assembly, marking compound with a brush for gear pattern analysis, and a gasket. This specific kit is engineered for fitment on 2001-2010 GM/Duramax and 2003-2010 Dodge/Cummins models equipped with the AAM 11.5 14-bolt rear axle. This ensures a proper and direct fit for the intended applications, simplifying the repair or upgrade process for owners of these vehicles.

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 GM11.5
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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