FAG SS3121 Wheel Seal Kit - Front

Wheel Seal Kit for Heavy-Duty Front Axles

FAG SS3121 is a wheel seal kit built for front wheel-end service on select Chevrolet and GMC heavy-duty applications. It uses a metal seal type with nitrile sealing material to help keep contamination out of the wheel end and retain grease at the bearing.

Fits 2001-2002 Chevrolet Silverado 3500, front inner; fits 2001-2002 GMC Sierra 3500, front; fits 1992-2000 Chevrolet C3500, front inner; fits 1992-2000 GMC C3500, front inner; fits 1980-1999 Chevrolet P30, front; fits 1979-1999 GMC P3500, front; fits 1975-1979 Chevrolet P30, front inner.

Key Features

• FAG wheel seal kit, part number SS3121
• Metal seal type with nitrile sealing material
• Bore diameter: 3.058 in. / 77.673 mm
• Seal outside diameter: 3.063 in. / 77.8 mm
• Seal width: 2.125 in. / 53.975 mm
• Built to meet vehicle-specific wheel seal requirements
• Cross-reference: Monroe Shocks & Struts 5682 for the same application

Detailed Description

FAG SS3121 is engineered for wheel-end sealing where precise dimensions matter. The seal is designed to protect front wheel components from dirt, dust, and moisture while helping prevent grease loss over the life of the bearing. With its metal construction and nitrile sealing material, this wheel seal supports the demands of heavy-duty front axle service on Chevrolet Silverado 3500, GMC Sierra 3500, Chevrolet C3500, GMC C3500, Chevrolet P30, and GMC P3500 applications.

The listed dimensions help confirm proper wheel seal selection for the specific axle and position. For buyers searching for a front inner wheel seal for Chevrolet C3500 or a front wheel seal for GMC P3500, FAG SS3121 provides a direct service replacement option. This part number is also referenced as SS3121 in catalog listings.

What This Part Helps Address

• Grease leakage at the wheel end
• Contamination from dirt, dust, and moisture
• Premature wheel bearing wear from seal failure
• Noise or roughness caused by compromised wheel-end lubrication
• Service needs on front inner or front wheel seal applications

Installation Notes and Tips

Verify the axle position, wheel-end configuration, and seal dimensions before installation. Confirm bore diameter, seal outside diameter, and seal width against the original part and the vehicle application. For best results, inspect the bearing, hub, and sealing surface for wear or damage before installing the new seal. This part fits specific front and front inner applications only, so match the vehicle year, make, model, and position carefully.

Quality Assurance

FAG designs wheel seals to meet vehicle manufacturer specifications and works with suppliers to maintain FAG quality standards. SS3121 is built for demanding wheel-end service where sealing performance and dimensional accuracy are important.