FAG SS2557 Wheel Seal - Rear

FAG SS2557 Wheel Seal for Rear Axles

The FAG SS2557 wheel seal is built for rear wheel-end service where contamination control and grease retention matter. It uses a nitrile sealing material with a metal and spring design to help keep dirt, dust, and moisture out of the bearing area while maintaining seal integrity over time.

Compatible with select Ford Mustang, Ford Thunderbird, Mercury Cougar, and Mercury Montego rear applications, this wheel seal is specified for demanding axle and bearing setups. The FAG SS2557 is a direct-fit style replacement for vehicles that require the listed bore and outside diameter dimensions.

Key Features

• Wheel seal for rear axle and wheel-end service
• Metal and spring seal type for stable sealing performance
• Nitrile sealing material
• Bore diameter: 2.26 in. / 57.404 mm
• Seal outside diameter: 2.264 in. / 57.506 mm
• Seal width: 1.5 in. / 38.1 mm
• Cross-reference part numbers include Four Seasons 14968 and National 9363S

Detailed Description

FAG SS2557 is a rear wheel seal engineered to meet vehicle-specific specifications for axle and bearing protection. The seal is designed to help prevent contamination from dirt, dust, and moisture while also reducing grease loss at the wheel end. Its metal and spring construction, paired with nitrile sealing material, supports consistent sealing in applications that require precise dimensions and reliable fitment. This part number is commonly searched for rear wheel seal replacement on 1968-1973 Ford Mustang, 1972 Ford Thunderbird, 1968-1972 Mercury Cougar, and 1968-1972 Mercury Montego applications.

This part cross-references Four Seasons 14968 and National 9363S for the same application.

What This Wheel Seal Helps Address

• Grease leakage at the rear wheel end
• Contamination from road dirt and dust
• Moisture intrusion around the axle seal area
• Wear related to degraded or damaged wheel seals
• Seal replacement needs on rear axle service jobs

Installation Notes and Tips

• Verify bore diameter, outside diameter, and seal width before installation.
• Confirm rear axle configuration and vehicle-specific notes, including WFD axle, 8.0 in. or 9.0 in. ring gear, and 31-spline axle shaft requirements where listed.
• Inspect the hub, spindle, and sealing surface for wear or scoring before installing the new seal.
• Clean the sealing area thoroughly so the nitrile lip can seat correctly.
• Use the exact application data for the vehicle, since wheel seal requirements vary by position and axle class.

Quality Assurance

FAG wheel seals are engineered using high-quality materials and built to meet vehicle manufacturer specifications. The SS2557 follows application-specific sealing requirements for rear wheel-end service and is designed around the dimensional and material standards needed for proper axle protection.