National 370047A Wheel Seal - Rear Inner

Overview of National 370047A Wheel Seal for Ford Trucks

The National 370047A wheel seal is designed specifically for Ford F-250, F-250 HD, and F-350 models. Engineered to provide reliable sealing performance, this oil bath seal helps maintain driveline integrity and prevent leaks in demanding conditions.

• Compatible with Ford F-250, F-250 HD, and F-350 models
• Part number 370047A for precise identification
• Constructed from durable nitrile material for resistance to oil and wear
• Redicoat finish enhances corrosion protection
• Designed for a shaft diameter of 3.437 inches (87.3 mm)
• Outside diameter measures 4.761 inches (120.93 mm)
• Width of 0.700 inches (15.37 mm) ensures proper fit and sealing
• Installation tool recommended: RD277

Technical Specifications and Material Details

This National wheel seal features a nitrile rubber compound, known for its excellent resistance to oil, heat, and abrasion, making it suitable for oil bath applications. The seal’s outside diameter is 120.93 mm (4.761 inches), with a housing bore of 120.78 mm (4.755 inches), ensuring a tight fit within the axle housing. The shaft diameter compatibility is 87.3 mm (3.437 inches), matching the axle shaft dimensions of Ford F-250 and F-350 trucks. The 0.700 inch (15.37 mm) width provides a secure sealing surface to prevent fluid leakage and contamination.

Applications and Problem Solving

• Prevents oil leaks in the driveline and axle assembly
• Protects axle bearings from dirt and moisture intrusion
• Maintains proper lubrication within the oil bath system
• Reduces wear on axle components by maintaining a sealed environment
• Helps avoid costly repairs related to seal failure in Ford F-250 and F-350 trucks

Installation Notes and Tips

For optimal installation, use the RD277 installation tool to ensure the seal is seated evenly and without damage. Clean the housing bore and shaft thoroughly before installation to remove debris and old sealant. Avoid using excessive force during installation to prevent distortion of the nitrile seal. Verify the seal orientation matches the oil bath design to maintain proper sealing function.

Quality Assurance and Warranty

National wheel seals are manufactured to meet OEM specifications for fit and function. The 370047A part includes a Redicoat finish to enhance corrosion resistance and extend service life. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects, ensuring reliability for Ford F-250, F-250 HD, and F-350 owners.