National 472572 Manual Transmission Output Shaft Seal

Overview of National Manual Transmission Output Shaft Seal 472572

The National Manual Transmission Output Shaft Seal 472572 is engineered to provide reliable sealing performance for select Chevrolet and Pontiac manual transmissions. Designed with durable nitrile material, this oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.

• Constructed from high-quality nitrile for enhanced durability and resistance to wear
• Inside diameter of 1.875 inches (47.630 mm) to fit specific output shafts
• Outside diameter measures 2.754 inches (69.950 mm) for precise housing bore compatibility
• Seal thickness of 0.312 inches (7.920 mm) ensures proper fit and sealing pressure
• Redicoat finish for improved corrosion resistance and extended service life
• Zero duplication part ensuring unique fit and performance

Detailed Product Description

This National output shaft seal, part number 472572, is designed specifically for manual transmissions in Chevrolet and Pontiac vehicles, including models such as the Camaro, Corvette, Firebird, Grand Am, Grand LeMans, LeMans, Malibu, and Monte Carlo. The seal’s nitrile construction offers excellent resistance to oil, heat, and wear, making it suitable for demanding transmission environments. With an inside diameter of 1.875 inches and an outside diameter of 2.754 inches, it fits precisely into a housing bore of 2.750 inches (69.850 mm), ensuring a secure and leak-free installation. The 0.312-inch thickness provides the necessary sealing surface to prevent transmission fluid leaks along the output shaft.

Applications and Common Issues Addressed

• Prevents transmission fluid leaks from the output shaft area
• Protects manual transmission internals from dirt and contaminants
• Reduces risk of premature transmission wear due to fluid loss
• Helps maintain proper lubrication and transmission performance
• Addresses seal degradation caused by heat and mechanical stress

Installation Notes and Tips

• Ensure the transmission output shaft and housing bore are clean and free of debris before installation
• Use appropriate tools to press the seal evenly into the housing bore without distortion
• Verify the seal orientation matches manufacturer specifications, typically with the lip facing the fluid side
• Inspect the shaft for wear or damage that could compromise the seal’s effectiveness
• Apply a light coating of transmission fluid or compatible lubricant to the seal lip prior to installation

Quality Assurance and Warranty

National’s Manual Transmission Output Shaft Seal 472572 is manufactured to meet strict quality standards, ensuring consistent dimensions and material properties. The seal is part of the 470000 series and features a Redicoat finish to resist corrosion. This product is backed by National’s warranty against defects in material and workmanship, providing confidence in its durability and performance when installed correctly in compatible Chevrolet and Pontiac manual transmissions.