Timken 394A Differential Race - Rear or Rear Inner

Timken 394A Differential Race for Heavy-Duty Rear Axles

Timken 394A is a differential race for rear axle service on select Chevrolet and GMC heavy-duty trucks. It is built for Rockwell C100 axle applications and pairs with tapered roller bearing components used in differential support.

Key Features

• Timken tapered roller bearing component for differential service
• Rear axle application for Rockwell C100 axle setups
• Supports both radial and axial load demands in differential operation
• Engineered for durability in compact bearing spaces
• Cross-references National 394A and OE-style numbers 407626B, 1113026

Product Details

Timken 394A is a differential race used in rear axle bearing service on Chevrolet C30, K30, R30, and V30 models, as well as GMC C3500, K3500, R3500, and V3500 trucks across the listed model years. This part number is part of Timken’s tapered roller bearing lineup, which is known for handling combined radial and axial loads in drivetrain applications. For reliable differential service, the cone and cup should be replaced together when wear is present.

Compatible With 1982-1986 Chevrolet C30, rear; 1982-1986 Chevrolet K30, rear; 1987-1988 Chevrolet R30, rear; 1987-1988 Chevrolet V30, rear; 1982-1986 GMC C3500, rear; 1982-1986 GMC K3500, rear; 1987-1991 GMC R3500, rear; 1987-1991 GMC V3500, rear; 1988-1991 Chevrolet C3500, rear; 1988-1991 Chevrolet K3500, rear; 1989-1991 Chevrolet R3500, rear; 1989-1991 Chevrolet V3500, rear.

Common Repair Uses

• Rear differential bearing race replacement
• Service for Rockwell C100 axle bearing wear
• Correction of differential noise from worn bearing surfaces
• Repair after pitting, scoring, or heat damage on the race
• Restoration of proper bearing preload and differential support

Installation Notes

Inspect the matching cone and replace both bearing components at the same time to maintain proper fit and service life. Confirm axle type and bearing dimensions before installation, and verify the rear differential application on the vehicle. Timken 394A is used in Rockwell C100 axle rear differential service on the listed Chevrolet and GMC trucks.

Quality Assurance

Timken is a recognized global manufacturer of tapered roller bearings and related drivetrain components. Its bearing technology is engineered for high-load operation and long service life in demanding axle applications.