National 8477S Wheel Seal - Rear

National 8477S Wheel Seal Overview

The National 8477S wheel seal is engineered to provide reliable sealing performance for driveline and axle applications. Designed with precision dimensions and durable nitrile material, this oil seal helps maintain proper lubrication and prevent contamination in compatible vehicle models.

• Inside diameter: 1.618 inches (41.097 mm)
• Outside diameter: 2.535 inches (64.390 mm)
• Housing bore: 2.531 inches (64.290 mm)
• Width: 0.750 inches (19.050 mm)
• Material: Nitrile rubber for resistance to oil and wear
• Series: 8000
• Type: 48

Technical Details and Specifications

The National 8477S wheel seal is part of the 8000 series, designed specifically for axle and driveline sealing applications. Its nitrile construction offers effective resistance to oil, grease, and other automotive fluids, ensuring a long service life. The seal’s precise inside diameter of 1.618 inches (41.097 mm) fits tightly around the shaft, while the outside diameter of 2.535 inches (64.390 mm) matches the housing bore to prevent leaks. With a width of 0.750 inches (19.050 mm), this seal provides a secure fit in the axle assembly.

Compatible Vehicles and Applications

This wheel seal is compatible with various makes and models requiring a 1.618-inch shaft diameter and a 2.535-inch housing bore. It is commonly used in driveline and axle assemblies of vehicles such as Ford F-Series trucks, Chevrolet Silverado, and Dodge Ram models. The National 8477S part number is often referenced in OEM and aftermarket repair guides for these applications.

Common Issues Addressed by the National 8477S Wheel Seal

• Prevents oil leaks from axle shafts
• Protects bearings from dirt and debris contamination
• Maintains proper lubrication within the driveline
• Reduces wear on axle components
• Helps avoid costly drivetrain repairs due to seal failure

Installation Notes and Tips

When installing the National 8477S wheel seal, ensure the shaft and housing bore are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the sealing lip. Lubricate the seal lip lightly with clean oil before installation to reduce initial wear. Verify the seal is seated flush and properly aligned to avoid premature failure.

Quality Assurance and Warranty

National wheel seals are manufactured to meet industry standards for durability and performance. The 8477S seal undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty terms may vary, National typically offers coverage against manufacturing defects to support professional repair and maintenance needs.