National 7038SA Manual Transmission Output Shaft Seal

Overview of National 7038SA Manual Transmission Output Shaft Seal

The National 7038SA manual transmission output shaft seal is engineered to provide reliable sealing performance for a range of vehicles including Bentley, Buick, Cadillac, Chevrolet, GMC, Jeep, Oldsmobile, Pontiac, and Rolls-Royce models. Designed with precision dimensions and durable nitrile material, this oil seal helps maintain transmission integrity and prevent fluid leaks.

• Inside diameter: 1.687 inches (42.85 mm)
• Outside diameter: 2.506 inches (63.65 mm)
• Thickness/width: 0.582 inches (14.78 mm)
• Sealing material: Nitrile for resistance to oil and wear
• Counter-clockwise spiral lip design for effective sealing
• Redicoat coating for enhanced corrosion resistance
• Compatible with housing bore size of 2.502 inches (63.55 mm)
• Part number: 7038SA, Series 7000, Type 41

Detailed Product Description and Specifications

The National 7038SA output shaft seal is constructed from nitrile, a synthetic rubber known for its excellent resistance to petroleum-based fluids and mechanical wear. Its counter-clockwise spiral lip design ensures a tight seal around the manual transmission output shaft, minimizing the risk of oil leaks that can lead to transmission damage. The seal’s dimensions—1.687 inch inside diameter and 2.506 inch outside diameter—are engineered to fit precisely in the housing bore of 2.502 inches, ensuring a secure installation. The 0.582 inch thickness provides durability and longevity under typical operating conditions. Additionally, the Redicoat treatment offers corrosion protection, extending the service life of the seal in demanding environments.

Compatible Vehicles and Applications

This manual transmission output shaft seal is compatible with a wide range of vehicles, including but not limited to:

• Bentley Continental and Silver Dawn
• Buick LeSabre, Riviera, and Skylark
• Cadillac DeVille, Eldorado, and Fleetwood
• Chevrolet Bel Air, Caprice, El Camino, and Impala
• GMC C10, C20, G10, G20, and Jimmy
• Jeep CJ5 and Wagoneer
• Oldsmobile 88, 98, and Starfire
• Pontiac Bonneville, Grand Prix, and GTO
• Rolls-Royce Phantom and Silver Dawn

Common Issues Addressed by the 7038SA Output Shaft Seal

• Prevents manual transmission fluid leaks from the output shaft area
• Reduces risk of contamination entering the transmission system
• Minimizes wear on transmission components caused by fluid loss
• Helps maintain proper transmission pressure and performance
• Protects against corrosion and seal degradation over time

Installation Notes and Tips

• Ensure the housing bore and shaft 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’s orientation matches the counter-clockwise spiral lip design for optimal sealing
• Lubricate the sealing lip with transmission fluid prior to installation to reduce initial wear
• Inspect the shaft for any damage or wear that could compromise the seal’s effectiveness

Quality Assurance and Warranty Information

National’s 7038SA output shaft seal is manufactured to meet industry standards for durability and performance. The use of nitrile material and Redicoat corrosion protection ensures a reliable seal under normal operating conditions. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects. It is recommended to consult the product documentation or supplier for exact warranty terms.