FAG SS3307 Wheel Seal - Rear or Rear Inner

Wheel Seal for Ford Rear Axles

FAG SS3307 is a wheel seal built for rear axle applications on select Ford trucks and vans, including Ford E-350 Super Duty, Ford F-350, and Ford E-Series rear axle setups. It is engineered to help keep wheel-end grease in place while blocking dirt, dust, and moisture from entering the bearing area.

• Wheel seal for rear inner and rear axle positions
• Nitrile sealing material for durable sealing performance
• Seal type: rubber, spring, auxiliary lip, inner shell
• Bore diameter: 3.876 in. / 98.45 mm
• Seal outside diameter: 3.881 in. / 98.577 mm
• Seal width: 2.875 in. / 73.025 mm
• OE-style application coverage for select Ford rear axle configurations

Application Details

FAG SS3307 is designed around demanding wheel-end specifications, with fitment coverage for 1974-2018 Ford rear axle applications. It fits 1999-2018 Ford E-350 Super Duty, rear inner; 1975-1994 Ford F-350, rear; 1981-1991 Ford E-250 Econoline, rear; 1981-1991 Ford E-250 Econoline Club Wagon, rear; and multiple Ford E-350 Econoline and E-350 Econoline Club Wagon rear axle configurations. This part cross-references National 9864S and SKF 28720 for the same application. The FAG SS3307 part number is also referenced by the global number 413 3307 100 in the fitment notes.

Wheel seals are critical to axle and bearing life because they retain lubricant and help keep contaminants out of the wheel end. For Ford E-350 Super Duty, Ford F-350, and other listed rear applications, the correct seal depends on axle design, position, and vehicle class, so matching the notes in the fitment table is important.

What This Seal Helps Address

• Grease loss at the wheel end
• Dirt and dust intrusion into the bearing area
• Moisture entering the axle seal zone
• Premature wear from contaminated wheel-end components
• Seal replacement on rear axle service jobs for Ford trucks and vans

Installation Notes and Tips

Verify axle type, position, and any notes such as Spicer full-floating axle, Ford axle, or ring gear exclusions before ordering. Confirm bore diameter, outside diameter, and seal width against the original seal and hub dimensions. Clean the sealing surface thoroughly and inspect the bearing, hub, and axle components for wear before installing the new seal.

Quality Assurance

FAG designs wheel seals to meet vehicle manufacturer specifications and works with suppliers to maintain FAG quality standards. The SS3307 uses high-quality sealing materials selected for wheel-end contamination control and lubricant retention in demanding axle applications.