Yukon ZK GM8.5-HD Master Overhaul Kit GM 8.5in Diff w/HD Posi Locker

Regular price: $134.95
Regular price: ~~$190.00~~
Sale price: $134.95

Shipping calculated at checkout.

In Stock: 4

Orders by 1pm PST ship same business day

Free Shipping w/3-4 Day Delivery

Authorized Dealer

Fitment Guarantee

30-Day Hassle Free Returns

Product Specification:

SKU:YUKZK GM8.5-HD

MPN: ZK GM8.5-HD

UPC: 883584370574

Weight: 6.0 lb

Inventory: 4

Type: Differential Overhaul Kits

Vehicle Fitment

Universal GM 8.5" 10-bolt rear differentials (incl. HD bearing carrier), compatible with GM trucks & SUVs 1970-2025

Features

USA Standard™ master overhaul kit for complete differential rebuild
Compatible with HD Posi-traction or mechanical lockers (Detroit, Eaton, Yukon, Auburn, etc.)
Includes heavy-duty Timken/Koyo bearings and races
Crush sleeve and pinion nut to establish proper preload
Comprehensive shim set for carrier/pinion depth adjustment
Ring gear bolts with thread locker
Seals and gaskets for pinion and axle ends
Marking compound with brush for gear pattern setup
Oil slinger/baffle to maintain lubrication balance

Specifications

Fits GM 8.5" ring gear, 10-bolt axle housing
Includes Timken/Koyo OEM-grade bearings and races
Ring gear bolt torque: 85 ft-lb with thread locker
Pinion preload via crush sleeve per GM spec (~20 in-lb rotational torque)
Shim thickness range: 0.001-0.025" for precise backlash/pinion depth
Oil slinger baffle diameter: fits 1.375" pinion shaft
Seals are nitrile, compatible with synthetic and mineral gear oils

Included Components

1x crush sleeve
1x pinion nut
8x carrier bearing shims
2x carrier bearings & races
1x pinion bearing & race
1x pinion seal
2x axle seals
10x ring gear bolts
1x gasket
1x marking compound with brush
1x tube thread locker
1x oil slinger/baffle

Product Description

The Yukon ZK GM8.5-HD Master Overhaul Kit is a complete differential rebuild kit engineered for GM 8.5" 10-bolt rear differentials equipped with heavy-duty bearing carriers and aftermarket traction setups. It's tailored for trucks and SUVs through 2025, ensuring longevity and performance when installing limited-slip or mechanical lockers such as Detroit, Eaton, or Yukon units. The kit's inclusion of OEM-grade Timken/Koyo bearings, crush sleeve, precision shims, and sealing components ensures a professional-level drivetrain rebuild.

Whether you're upgrading gear ratio, replacing worn bearings, or installing a locker, this kit provides everything necessary for a properly set up differential - ring gear bolts, pinion nut, gasket, marking compound, and oil slinger are all included. Preload and backlash are accurately adjustable via the shim set, with torque values and shim ranges conforming to GM specifications. Ideal for DIYers and professional shops alike.

Installation notes: Requires pinion depth tool, inch-lb torque wrench, and dial indicator for backlash measurement. Crush sleeve must be replaced with each rebuild to ensure correct pinion preload. Compatible with all gear ratios and carrier types for GM 8.5" diffs; verify automotive emissions legality - this rebuild kit maintains stock configuration without emissions impact.