LuK GDK321C Differential Bearing Kit

The LuK GDK321C is a rear axle differential bearing and seal kit for service work on GM and related truck and SUV applications. It brings together OE-quality bearings selected for the specific transmission or differential repair, helping restore smooth operation in the rear differential.

Compatible With 1999-2010 Chevrolet, GMC, Cadillac, Hummer, Buick, Saab, Isuzu, and related rear differential applications using the standard 8.5"/8.6" setup.

Key Features

• OE-quality differential bearings for professional repair
• Rear axle differential bearing and seal kit format
• Application-specific component selection for the listed vehicles
• Cross-reference part numbers include SKF SDK321-C and Timken DRK321C
• Part number: GDK321C

Detailed Description

LuK GDK321C is built for rear differential service on a wide range of GM trucks, SUVs, and utility vehicles, including Chevrolet Silverado 1500, Tahoe, Suburban 1500, and GMC Sierra 1500 applications. It also covers related platforms such as Cadillac Escalade, Hummer H3, and Buick Rainier when equipped with the standard 8.5"/8.6" rear differential. The kit is assembled with OE-quality bearings chosen for the individual transmission or differential repair, supporting a professional-level rebuild.

This part cross-references SKF SDK321-C and Timken DRK321C for the same application. Part number GDK321C is commonly searched for rear differential bearing kit service on Chevrolet Silverado 1500 and GMC Sierra 1500 rear axle repairs.

What It Helps Repair

• Rear differential bearing noise
• Excessive drivetrain vibration from worn bearings
• Gear mesh issues caused by bearing wear
• Leak-related service needs during differential repair
• Restoration of smooth rear axle operation

Installation Notes and Tips

Verify the rear axle is the standard 8.5"/8.6" differential before ordering. Compare the existing bearing and seal arrangement to the vehicle listing, and inspect the housing, gears, and related components during service. Professional installation is recommended for differential repair work to ensure correct setup and bearing preload.

Quality Assurance

LuK selects OE-quality components for each specific transmission or differential application, supporting a repair standard suited to professional drivetrain service.