National 3747 Wheel Seal - Rear

Overview of National 3747 Wheel Seal

The National 3747 wheel seal is engineered for reliable sealing performance in driveline and axle applications. Designed specifically for Chevrolet and GMC trucks and SUVs, this oil seal helps maintain proper lubrication and prevent contamination in wheel hubs.

• Inside diameter: 1.703 inches (43.260 mm)
• Outside diameter: 3.090 inches (78.490 mm)
• Width: 0.500 inches (12.700 mm)
• Material: Durable nitrile rubber for resistance to oil and wear
• Bi-directional lip design for effective sealing under varying rotational directions
• Redicoat surface treatment for enhanced corrosion resistance
• Compatible with housing bore of 3.084 inches (78.330 mm)
• Part of the National 3000 series oil seals

Detailed Product Description

The National 3747 wheel seal is a precision-engineered oil seal designed to fit shafts with a diameter of 1.703 inches and housings with a bore diameter of approximately 3.084 inches. Constructed from nitrile material, it offers excellent resistance to petroleum-based fluids and mechanical wear, making it suitable for demanding automotive environments. The bi-directional lip design ensures effective sealing whether the shaft rotates clockwise or counterclockwise, reducing the risk of lubricant leakage and ingress of dirt or moisture. The redicoat finish provides additional protection against corrosion, extending the service life of the seal in harsh conditions.

Compatible Vehicles and Applications

This wheel seal is compatible with a range of Chevrolet and GMC trucks and SUVs, including:

• Chevrolet C20, C20 Suburban, C2500, C2500 Suburban
• Chevrolet K20, K20 Suburban, K2500, K2500 Suburban
• Chevrolet P20, P2500
• Chevrolet R20, R20 Suburban, R2500, R2500 Suburban
• Chevrolet V20, V20 Suburban, V2500, V2500 Suburban
• GMC G30

Common Issues Addressed by National 3747 Wheel Seal

• Prevents oil leaks from wheel hubs and axle assemblies
• Protects bearings from dirt, dust, and moisture contamination
• Reduces premature wear of driveline components
• Maintains proper lubrication for smooth wheel rotation
• Helps avoid costly repairs due to seal failure

Installation Notes and Tips

• Ensure shaft and housing surfaces are clean and free of debris before installation
• Use appropriate tools to avoid damaging the seal lips during installation
• Verify correct orientation of the bi-directional lip design for optimal sealing
• Check housing bore and shaft dimensions to confirm compatibility
• Apply a light coating of lubricant on the seal lip to ease installation and prevent damage

Quality Assurance and Warranty

The National 3747 wheel seal is manufactured to meet industry standards for durability and performance. It is part of the National 3000 series, known for consistent quality in sealing solutions. This product includes a limited warranty against defects in material and workmanship, ensuring reliability when installed and used as intended.