National 480210 Manual Transmission Input Shaft Seal

Overview of National Manual Transmission Input Shaft Seal 480210

The National 480210 manual transmission input shaft seal is engineered to provide reliable sealing performance for select Ford and Mercury vehicles. Designed with durable nitrile material, this oil seal helps maintain transmission integrity by preventing fluid leaks and contamination.

• Constructed from high-quality nitrile for resistance to oil and wear
• Inside diameter of 1.062 inches (26.970 mm) to fit input shafts precisely
• Outside diameter measures 1.503 inches (38.180 mm) for secure housing bore fitment
• Seal thickness of 0.312 inches (7.920 mm) ensures proper sealing depth
• Includes Redicoat coating for enhanced corrosion protection
• Compatible with Ford and Mercury models including Capri, Econoline, F-100, Mustang, and Villager

Detailed Product Description and Specifications

The National 480210 input shaft seal is part of the 480000 series, designed specifically for manual transmissions requiring a 48-type seal. Its nitrile construction offers excellent resistance to petroleum-based fluids and mechanical wear, making it suitable for demanding automotive environments. The seal’s precise dimensions—1.062 inch inside diameter and 1.503 inch outside diameter—match the input shaft and housing bore measurements (1.499 inches), ensuring a tight, leak-free fit. The 0.312 inch thickness provides adequate sealing surface without interfering with transmission components. Additionally, the Redicoat finish helps protect the metal casing from corrosion, extending the seal’s service life.

Applications and Common Issues Addressed

• Prevents transmission fluid leaks from the input shaft area
• Protects manual transmission internals from dirt and debris ingress
• Reduces risk of premature transmission wear due to fluid contamination
• Helps maintain proper lubrication levels within Ford and Mercury manual transmissions
• Addresses common seal failure symptoms such as oil seepage and shaft wear

Installation Notes and Tips

• Ensure the transmission input 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 the original part to maintain proper sealing function
• Inspect the shaft for wear or damage that could compromise the new seal
• Apply a light coating of transmission fluid to the seal lip before installation to reduce initial wear

Quality Assurance and Warranty Information

National seals are manufactured to meet industry standards for durability and performance. The 480210 input shaft seal is a zero duplication part, ensuring it matches OEM specifications for fit and function. 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 for Ford and Mercury manual transmission applications.