National 40769S Wheel Seal - Front, Rear or Rear Inner

National 40769S Wheel Seal Overview

The National 40769S wheel seal is engineered to provide reliable sealing performance for driveline and axle applications. Designed with durable nitrile material, this oil seal is compatible with select Chevrolet, Dodge, and Ford vehicles, including Bronco, F-100, F-250, F-350, K10 Suburban, K20, K20 Suburban, and Ramcharger models.

• Inside diameter: 1.312 inches (33.320 mm)
• Outside diameter: 2.286 inches (58.060 mm)
• Thickness/width: 0.250 inches (6.350 mm)
• Sealing material: Nitrile for resistance to oil and wear
• Housing bore size: 2.282 inches (57.960 mm)
• Part type: 4s oil seal from National's 40000 series

Technical Details and Specifications

The National 40769S wheel seal is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based oils and fluids, making it suitable for axle and driveline sealing applications. The seal features an inside diameter of 1.312 inches (33.320 mm) and an outside diameter of 2.286 inches (58.060 mm), with a thickness of 0.250 inches (6.350 mm). This precise sizing ensures a secure fit within the housing bore of 2.282 inches (57.960 mm), providing effective sealing against contaminants and fluid leaks.

Compatible Vehicles and Applications

This wheel seal is compatible with a range of classic and heavy-duty vehicles, including Chevrolet Bronco, Dodge Ramcharger, and Ford trucks such as the F-100, F-250, F-350, K10 Suburban, K20, and K20 Suburban. The National 40769S is designed to meet the sealing requirements of these models, ensuring proper axle and driveline function.

Common Uses and Problem Resolution

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

Installation Notes and Tips

When installing the National 40769S wheel seal, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip. Verify the seal orientation matches the original part to maintain proper sealing function. Lubricate the seal lip lightly with compatible oil before installation to reduce initial wear.

Quality Assurance and Warranty

Manufactured by National, a trusted name in sealing solutions, the 40769S wheel seal adheres to strict quality standards for durability and performance. The nitrile material offers resistance to oil and environmental factors, contributing to long service life. Warranty coverage details should be confirmed with the product documentation or supplier.