Axle Differential Bearing and Seal Kit for GM 8.5"/8.6" Rear Ends

The Luk GDK321K is an axle differential bearing and seal kit for rear standard differential applications using 8.5"/8.6" housings. It is a direct-fit service kit for a wide range of Chevrolet, GMC, Cadillac, and related GM-platform vehicles.

• Axle differential bearing and seal kit for rear differential service
• Fits standard 8.5"/8.6" differential applications
• OE-style service part from Luk
• Built for rear axle differential maintenance and rebuild work
• Part number: GDK321K

Vehicle Fitment

• Fits 2009-2010 Hummer H3, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2009-2010 Hummer H3T, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2002-2008 Cadillac Escalade, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2003-2008 Cadillac Escalade ESV, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2007-2008 Chevrolet Avalanche, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 1999-2008 Chevrolet Express 1500, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2000-2008 Chevrolet Silverado 1500, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2000-2008 Chevrolet Suburban 1500, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2000-2008 Chevrolet Tahoe, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2002-2008 Chevrolet Trailblazer, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2002-2008 GMC Envoy, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 1999-2008 GMC Savana 1500, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2000-2008 GMC Sierra 1500, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2000-2008 GMC Yukon, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2000-2008 GMC Yukon XL 1500, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2003-2008 Isuzu Ascender, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2005-2008 Saab 9-7x, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2004-2007 Buick Rainier, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2002-2006 Chevrolet Avalanche 1500, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2005-2006 Chevrolet Silverado 1500 HD, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2001-2003 Chevrolet Silverado 1500 HD, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2003-2006 Chevrolet SSR, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2005-2006 GMC Sierra 1500 HD, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 2001-2003 GMC Sierra 1500 HD, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 1999-2005 Chevrolet Blazer, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 1999-2005 GMC Jimmy, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 1999-2004 Chevrolet S10, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 1999-2004 GMC Sonoma, rear, Standard Differential Kit, 8.5"/8.6"
• Fits 1999-2000 Isuzu Hombre, rear, Standard Differential Kit, 8.5"/8.6"

Common Service Uses

• Rear differential bearing noise during acceleration or deceleration
• Gear oil seepage at the axle or differential seals
• Worn bearings found during differential rebuild service
• Maintenance on GM 8.5"/8.6" rear axle assemblies
• Service work on Chevrolet Silverado 1500, Tahoe, and GMC Sierra 1500 rear differentials

Installation Notes

Confirm the axle housing uses the standard 8.5"/8.6" rear differential before ordering. Inspect the ring and pinion, axle shafts, and housing surfaces during service, and replace worn components as needed. Proper setup and bearing preload are important for differential longevity, so installation should follow factory service procedures.

Quality Assurance

Luk is an established OE supplier in driveline applications, and the GDK321K is built as a service kit for rear differential repair on supported GM vehicles. This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.