National 710426 Manual Transmission Output Shaft Seal

Overview of National 710426 Manual Transmission Output Shaft Seal

The National 710426 manual transmission output shaft seal is engineered for reliable sealing performance in Ford Mustang and Pontiac GTO vehicles. Constructed from durable nitrile material, this oil seal is designed to maintain transmission integrity and prevent fluid leaks.

• Material: High-quality nitrile for resistance to oil and wear
• Inside Diameter: 1.500 inches (38.10 mm)
• Outside Diameter: 2.385 inches (60.58 mm)
• Thickness: 0.433 inches (11.00 mm)
• Triple lip design with bi-directional helix for enhanced sealing
• Compatible with housing bore size of 2.377 inches (60.38 mm)
• Overall width with side lip: 1.043 inches (26.5 mm)

Detailed Product Description

This National 710426 output shaft seal is part of the 710400 series, specifically designed for manual transmissions in select Ford Mustang and Pontiac GTO models. The seal features a triple lip design combined with a bi-directional helix lip, which provides effective sealing against oil leaks while accommodating shaft rotation in both directions. Made from nitrile, the seal offers excellent resistance to heat, oil, and wear, ensuring durability under demanding transmission conditions. The precise dimensions, including a 1.5-inch shaft diameter and 2.385-inch outside diameter, ensure a proper fit within the transmission housing bore of 2.377 inches.

Applications and Problem Solving

• Prevents oil leaks from the manual transmission output shaft
• Reduces contamination ingress to protect transmission components
• Maintains proper lubrication levels within the transmission
• Minimizes wear on the output shaft and surrounding parts
• Helps avoid costly transmission repairs due to seal failure

Installation Notes and Tips

When installing the National 710426 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 lips. Verify the shaft diameter matches the 1.5-inch specification for optimal sealing. Lubricate the seal lips lightly with transmission fluid before installation to reduce initial wear. Proper alignment and careful handling during installation will extend the service life of the seal.

Quality Assurance and Warranty

National seals are manufactured to meet industry standards for durability and performance. The 710426 output shaft seal undergoes rigorous quality control to ensure dimensional accuracy and material integrity. While specific warranty details may vary, National typically offers coverage against manufacturing defects to provide confidence in product reliability for Ford Mustang and Pontiac GTO manual transmission applications.