FAG SS3391 Wheel Seal - Rear

FAG SS3391 Wheel Seal Overview

The FAG SS3391 wheel seal is built for wheel-end service where contamination control and grease retention matter. It uses a nitrile sealing material with a metal, spring, inner shell design to help protect bearing components from dirt, dust, and moisture.

For wheel seal replacement on applications such as Ford F-150 and Chevrolet Silverado, the SS3391 is sized to match demanding wheel-end specifications and support reliable sealing performance.

Key Features

• Part number: SS3391
• Wheel seal design for driveline and axle service
• Seal type: metal, spring, inner shell
• Sealing material: nitrile
• Bore diameter: 4.876 in. (123.85 mm)
• Seal outside diameter: 4.881 in. (123.977 mm)
• Seal width: 3.625 in. (92.075 mm)
• Engineered to help retain grease and block contamination at the wheel end

Detailed Description

FAG SS3391 is a wheel seal designed for the wheel end of axle assemblies where precise dimensions and sealing integrity are critical. The nitrile sealing element is paired with a metal spring and inner shell construction to maintain contact and help keep grease in place while limiting the entry of road debris and moisture. This makes the SS3391 a practical choice for wheel seal replacement on Ford F-150 and Chevrolet Silverado service jobs where correct bore, outside diameter, and width are essential. This part number, SS3391, is built to meet vehicle manufacturer specifications through FAG’s supplier-controlled design and material standards.

This part cross-references Gates 36314 for the same application.

What It Helps Address

• Grease loss at the wheel end
• Contamination from dirt, dust, and moisture
• Premature bearing wear caused by seal failure
• Leakage around the axle hub sealing area
• Noise or roughness related to compromised wheel-end lubrication

Installation Notes and Tips

Verify bore diameter, seal outside diameter, and seal width against the original seal before installation. Clean the hub and axle sealing surfaces thoroughly, and inspect the bearing and spindle area for wear or scoring before pressing in the new seal. Proper seating is important for wheel seal replacement on Ford F-150 and Chevrolet Silverado applications, and the SS3391 should be installed only after confirming the application-specific dimensions and position requirements.

Quality Assurance

FAG designs wheel seals to meet vehicle manufacturer specifications and works with suppliers to maintain its quality standards. The SS3391 is engineered for demanding wheel-end service where consistent sealing performance is required.