National 472258 Manual Transmission Output Shaft Seal - Rear or Rear Outer

Overview of National Manual Transmission Output Shaft Seal 472258

The National 472258 manual transmission output shaft seal is engineered for reliable sealing performance in select Chevrolet, Ford, and Mercury vehicles. Designed to maintain transmission fluid integrity, this oil seal supports smooth operation in models such as the Chevrolet Corvette, Ford Tempo, and Mercury Topaz.

• Inside diameter: 1.375 inches (34.930 mm)
• Outside diameter: 2.004 inches (50.900 mm)
• Thickness/width: 0.312 inches (7.920 mm)
• Sealing material: durable nitrile compound
• Redicoat coating for enhanced wear resistance
• Compatible housing bore: 2.000 inches (50.800 mm)
• Part number: 472258

Technical Details and Material Specifications

This National manual transmission output shaft seal (part number 472258) is constructed from nitrile, a synthetic rubber known for its resistance to oil, heat, and wear. The seal features a Redicoat surface treatment that improves durability and extends service life. With an inside diameter of 1.375 inches and an outside diameter of 2.004 inches, it fits precisely within a 2.000-inch housing bore, ensuring a secure seal around the output shaft. The 0.312-inch thickness provides adequate sealing surface without compromising fitment.

Compatible Vehicles and Applications

This output shaft seal is compatible with manual transmissions in specific vehicle models, including Chevrolet Corvette, Ford Tempo, and Mercury Topaz. It is designed to replace worn or damaged seals in these vehicles, helping to prevent transmission fluid leaks and maintain optimal transmission performance.

• Prevents transmission fluid leaks in manual transmissions
• Reduces contamination ingress to transmission internals
• Maintains proper lubrication of output shaft components
• Helps avoid premature wear of transmission bearings and gears
• Supports smooth shifting and transmission reliability

Installation Notes and Tips

When installing the National 472258 output shaft seal, ensure the transmission housing bore is clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip or nitrile material. Verify the seal orientation matches the original part to maintain proper sealing function. Lubricate the seal lip lightly with transmission fluid before installation to reduce initial wear.

Quality Assurance and Warranty Information

National manufactures this output shaft seal to meet industry standards for durability and performance. The nitrile material and Redicoat treatment contribute to long service life under normal operating conditions. This part is a zero duplication part, ensuring authenticity and precise fitment. Warranty coverage details should be confirmed with the original equipment manufacturer or distributor.