National 9864S Wheel Seal - Rear Inner

National 9864S Wheel Seal for Ford Rear Axles

National 9864S is a rear wheel seal built for Ford full-floating and Spicer axle applications that need a precise sealing fit at the hub. It uses nitrile material and Redicoat protection to help maintain a dependable seal in demanding driveline service.

Key Features

• Wheel seal / oil seal for rear inner and rear applications
• Nitrile sealing material for common axle and hub service conditions
• Redicoat finish for improved installation handling
• Inside diameter: 2.875 in. / 73.030 mm
• Outside diameter: 3.880 in. / 98.550 mm
• Flanged outside diameter: 4.200 in. / 106.680 mm
• Housing bore: 3.875 in. / 98.430 mm
• Width: 0.515 in. / 13.080 mm
• National 9864S / Series 9000 / Type 57

Detailed Description

National 9864S is a driveline and axle sealing component for Ford rear axle service, including E-350 Super Duty, E-350 Econoline, E-250 Econoline, F-350 Super Duty, F-350, and related rear inner applications listed in the fitment data. This seal is sized for a 2.875-inch shaft and a 3.875-inch housing bore, with a 3.880-inch outside diameter and 0.515-inch width to support proper sealing at the wheel end. National has focused on sealing solutions for decades, and this part reflects that experience with a practical OE-style design for service replacement work. This part cross-references SKF 28720 and Spicer 47507 for the same application.

What It Is Used For

• Replacing a leaking rear wheel seal on Ford E-350 Super Duty rear inner applications
• Servicing Ford F-350 rear inner axle seals on dual rear wheel and Spicer axle setups
• Addressing gear oil seepage at the hub or axle end
• Restoring sealing performance after wear, contamination, or age-related hardening
• Supporting rear axle maintenance on full-floating Ford van and truck platforms

Installation Notes and Tips

Verify shaft diameter, housing bore, axle type, and position before installation. This seal is listed for rear and rear inner locations, with fitment notes that include full-floating, Spicer 60, Spicer 61, Spicer 70, and Spicer 80 axle configurations on specific Ford applications. Clean the bore and shaft surface thoroughly, inspect for grooves or damage, and install the seal squarely to avoid distortion. For best results, confirm the exact vehicle configuration, since some Ford E-Series and F-Series applications vary by axle and traction control equipment.

Quality Assurance

National is a long-established sealing brand with more than 75 years of experience in sealing technology. The 9864S is part of the 9000 series and is engineered as a service replacement seal for the listed Ford rear axle applications.