FAG SS3920 Drive Axle Shaft Seal - Rear

Rear Drive Axle Shaft Seal for Ford Super Duty

FAG SS3920 is a rear drive axle shaft seal built for Ford Super Duty trucks that need dependable wheel-end sealing. It helps keep contamination out of the bearing area while retaining grease for long-term service.

• Fits 1999-2017 Ford F-350 Super Duty, rear
• Fits 2009-2016 Ford F-250 Super Duty, rear
• Engineered to help block dirt, dust, and moisture at the wheel end
• Supports grease retention over the service life of the bearing
• Built to meet vehicle-specific sealing requirements for the application

Application Details

This FAG SS3920 drive axle shaft seal is used at the rear axle wheel end to protect critical driveline components from contamination. It is a direct-fit sealing component for Ford F-350 Super Duty and Ford F-250 Super Duty rear applications, where the seal specification depends on vehicle class and position. This part cross-references SKF (e.g., 4A322) for the same application.

Common Problems It Helps Address

• Grease loss at the rear wheel end
• Contamination from road dirt and dust
• Moisture intrusion around the axle shaft seal area
• Premature wear of wheel-end bearing components
• Seal leakage related to aging or damaged axle seals

Installation Notes

Verify axle position and vehicle fitment before installation. Inspect the sealing surface, bearing area, and surrounding components for wear or damage before replacing the seal. Proper installation and clean mating surfaces are important for sealing performance on Ford F-350 Super Duty and Ford F-250 Super Duty rear axle applications.

Quality Assurance

FAG designs wheel seals using high-quality materials and application-specific specifications to meet vehicle manufacturer requirements. Part number SS3920 is built for rear axle sealing performance in demanding driveline service.