Timken DRK321 Axle Differential Bearing and Seal Kit - Front or Rear

Timken DRK321 Differential Bearing Kit

Timken DRK321 is an axle differential bearing and seal kit for rear axle service and select front differential applications on GM trucks, SUVs, and classic passenger cars. It is built for 8.5 in. ring gear applications and gives you the bearings and seals needed to complete the repair.

This part cross-references DK321 and SKF SDK321 for the same application.

Key Features

• Axle differential bearing and seal kit for driveline service
• For 8.5 in. ring gear standard fitment applications
• Supports rear axle rebuilds and select front differential service on manual-transmission 4x4 models
• Timken DT Components rebuild kit
• Used on Chevrolet C1500, K1500, Tahoe, GMC Yukon, and related applications

Application Details

Timken markets this kit under the DT Components line for differential, transfer case, and transmission service. DRK321 is a rebuild kit that includes the bearings and seals needed for the job, and it is offered as a standard kit rather than a master kit. Fitment covers a wide range of Chevrolet, GMC, Buick, Oldsmobile, Pontiac, and Cadillac vehicles from 1965-1996, including rear axle service on Chevrolet C1500, K1500, and GMC Yukon models, plus front differential service on select manual-transmission 4x4 trucks and SUVs such as Chevrolet K1500 and GMC K2500. The Timken DRK321 is also listed for classic rear axle applications like Chevrolet Nova, Monte Carlo, El Camino, and Pontiac Firebird.

Common Repair Uses

• Rear axle bearing and seal wear
• Differential noise from worn bearings
• Gear oil leaks at the axle seals
• Service on 8.5 in. ring gear rear ends
• Front differential bearing service on select 4x4 manual-transmission models

Installation Notes

Verify axle housing, ring gear size, and position before ordering. This kit is listed for rear applications on many GM rear-wheel-drive and 4x4 platforms, and for front applications only on select manual-transmission models with an 8.5 inch ring gear and transfer case output shaft differential pinion bearing. Clean the housing thoroughly, inspect the gears and races, and replace worn seals during reassembly. Confirm vehicle-specific fitment for Chevrolet C1500, GMC K1500, and Buick Roadmaster before installation.

Quality Assurance

Timken supplies drivetrain service kits through its DT Components brand, with rebuild kits assembled to include the bearings and seals required for differential service.