National 4764 Automatic Transmission Extension Housing Seal

Overview of National 4764 Automatic Transmission Extension Housing Seal

The National 4764 automatic transmission extension housing seal is engineered to provide reliable sealing performance for select Ford, Lincoln, Mercury, and Nissan vehicles. Designed with precision dimensions and durable polyacrylate material, this oil seal helps maintain transmission integrity and prevent fluid leaks.

• Inside diameter: 1.598 inches (40.590 mm)
• Outside diameter: 2.483 inches (63.070 mm)
• Flanged outside diameter: 2.747 inches (69.770 mm)
• Thickness: 0.420 inches (10.670 mm)
• Counter-clockwise spiral lip design for enhanced sealing
• Constructed from polyacrylate sealing material
• Redicoat surface treatment for improved wear resistance
• Compatible with Ford, Lincoln, Mercury, and Nissan models

Technical Details and Material Specifications

This National 4764 transmission extension housing seal features a counter-clockwise spiral lip design that ensures a tight seal around the shaft, reducing the risk of transmission fluid leaks. The seal’s polyacrylate material offers resistance to heat and chemical degradation commonly encountered in automatic transmission environments. With an overall width of 0.420 inches and a flanged outside diameter of 2.747 inches, it fits precisely within the housing bore of 2.476 inches, providing a secure and durable fit.

Compatible Vehicles and Applications

The National 4764 seal is compatible with a range of vehicles including Ford F-150, F-250, E-150 Econoline, Lincoln Navigator, Mercury Mountaineer, and Nissan Altima and Maxima models. This part is specifically designed for use in automatic transmission extension housings, ensuring proper sealing and fluid retention in these applications.

• Prevents transmission fluid leaks in Ford F-150 and F-250 models
• Maintains transmission integrity in Lincoln LS and Navigator
• Seals extension housing on Mercury Mountaineer and Cougar
• Compatible with Nissan Altima and Maxima automatic transmissions
• Helps avoid premature transmission wear due to fluid loss

Installation Notes and Tips

When installing the National 4764 automatic transmission extension housing seal, ensure the housing bore and shaft are clean and free of debris. Lubricate the seal lip with transmission fluid before installation to prevent damage. Use appropriate tools to press the seal evenly into the housing bore without distortion. Verify the counter-clockwise spiral lip orientation matches the shaft rotation direction for optimal sealing performance.

Quality Assurance and Warranty Information

National transmission seals are manufactured to meet industry standards for durability and performance. The 4764 seal includes a Redicoat surface treatment to enhance wear resistance and extend service life. While specific warranty terms may vary, National products typically come with a limited warranty against defects in material and workmanship, providing confidence in the product’s reliability.