Eaton K-GM8.5-08R Master Differential Install Kit for 1999-2008 GM 8.5" 10-Bolt

Regular price: $169.95
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Product Specification:

SKU:EATK-GM8.5-08R

MPN: K-GM8.5-08R

Weight: 6.0 lb

Inventory: 10

Type: Differential Install Kits

Vehicle Fitment

1999-2008 Chevrolet Silverado 1500 (2WD/4WD, Cab/Box configurations)
1999-2008 GMC Sierra 1500 (2WD/4WD, Cab/Box configurations)
1999-2008 Chevrolet Tahoe / Suburban 1500 (2WD/4WD)
1999-2008 GMC Yukon / Yukon XL 1500 (2WD/4WD)
1999-2008 Cadillac Escalade / Escalade ESV / Escalade EXT (2WD/4WD)
2004-2007 Buick Rainier, 2002-2008 Isuzu Ascender (when equipped with GM 8.5/8.6 rear, 10-bolt)

Fitment Notes

Fits **GM 8.5" / 8.6"** 10-bolt rear axle with **C-clip** axles.
Standard ring gear rotation (OEM style), *not* reverse-rotation.
Does **not** fit 14-bolt 9.5" GM rear axle, or heavier duty corporate 14 bolts. Ensure your axle is the 10-bolt 8.5/8.6 before ordering.
Fitment confirmed through **2008**; **2009-2025 unconfirmed** in published sources.

Features

Premium Timken bearings and races included for durable, quiet performance.
Carrier shims included for correct backlash and preload setup.
Pinion seal and pinion nut included, plus crush sleeve for proper pinion bearing preload.
Includes ring gear bolts and cover bolts to replace OEM fasteners.
Standard rotation ring gear (matching original GM 8.5/8.6 rear orientation).
Thread-locking compound and gear marking compound included to aid assembly and ensure proper break-in.
Includes both head (inner) and tail (outer) pinion bearings and races.
Carrier bearings included (left & right) to ensure full differential rebuild capability.

Specifications

Position: Rear axle
Axle Type: GM 8.5" / 8.6" 10-bolt semi-floating rear with C-clip retention.
Axle spline count: 30 splines.
Pinion spline count: 30 splines.
Number of ring gear bolts: 10 bolts.
Number of cover bolts: 10 bolts.
Ring gear rotation: Standard OEM GM (non-reverse).
Bearing brand: Timken.
General declared kit weight: ~6 lb.

Included Components

1x Crush sleeve
1x Pinion seal
1x Pinion nut
1x Complete pinion inner & outer bearings & races
2x Carrier bearings & races (left & right)
Carrier shims set
Ring gear bolts (10 pcs)
Cover bolts (10 pcs)
Thread locking compound
Gear marking compound

Product Description

The Eaton K-GM8.5-08R Master Differential Install Kit is a comprehensive overhaul kit designed for rebuilding or servicing the **GM 8.5 / 8.6 inch 10-bolt rear axle**. It contains every major wear-component needed: Timken bearings, races, ring gear & cover bolts, seals, crush sleeve and shims. Whether you're performing a routine service or replacing worn parts after heavy use, this kit ensures the rebuild meets OE tolerances and lasts longer under load.

This part is verified to fit **1999-2008** GM light trucks and SUVs (Silverado, Sierra, Tahoe, Yukon, Suburban, Escalade, etc.) whenever they are equipped with the 10-bolt GM 8.5/8.6 rear axle. It **does not** fit 14-bolt or heavier duty rear ends (such as the GM 9.5" 14-bolt). Fitment for **2009-2025 is unconfirmed**. Before purchase, check your axle's ring gear diameter, number of cover bolts, spline counts (30), and that it uses the C-clip retention style; these details are critical to proper fitment.