National 710709 Automatic Transmission Output Shaft Seal - Left

Overview of National 710709 Automatic Transmission Output Shaft Seal

The National 710709 automatic transmission output shaft seal is engineered to provide reliable sealing performance for a range of vehicles including Buick, Cadillac, Chevrolet, Ford, GMC, Lincoln, Mazda, Mercury, Pontiac, and Saturn models. Designed with precision, this seal helps maintain transmission fluid integrity and prevents leaks in critical drivetrain components.

• Inside diameter options: 1.417 inches (36.000 mm)
• Outside diameter: 2.409 inches (61.200 mm)
• Flanged outside diameter: 2.638 inches (67.000 mm)
• Thickness: 0.394 inches (10.000 mm)
• Bi-directional lip design for enhanced sealing
• Constructed from durable ethylene-acrylic material
• Compatible with housing bore diameter of 2.402 inches (61.000 mm)

Technical Details and Material Specifications

The National 710709 output shaft seal features a bi-directional lip design that ensures effective sealing against transmission fluid leaks in both rotational directions. Its ethylene-acrylic composition offers resistance to heat, wear, and transmission fluids, making it suitable for demanding automotive environments. The seal’s dimensions, including a 1.417-inch inside diameter and a 2.409-inch outside diameter, are designed to fit precisely within the transmission housing bore of 2.402 inches, ensuring a secure and leak-free installation.

Compatible Vehicles and Applications

This automatic transmission output shaft seal is compatible with a wide range of vehicles, including Buick models like LaCrosse and Regal, Cadillac XT4 and Escalade, Chevrolet Cruze and Malibu, Ford Edge and Explorer, GMC Terrain, Lincoln MKC and MKZ, Mazda Tribute, Mercury Mariner, Pontiac G6, and Saturn Aura. The part number 710709 is specifically designed to meet the sealing requirements of these models, providing a reliable replacement option for transmission maintenance and repair.

Common Issues Addressed by the National 710709 Seal

• Prevents transmission fluid leaks from the output shaft area
• Reduces risk of contamination entering the transmission system
• Maintains proper fluid pressure within the transmission
• Minimizes wear on transmission components caused by fluid loss
• Helps avoid costly transmission damage due to seal failure

Installation Notes and Tips

When installing the National 710709 output shaft seal, ensure the transmission housing bore is clean and free of debris. Use appropriate tools to avoid damaging the seal lips during installation. Verify the seal orientation matches the bi-directional lip design for optimal performance. It is recommended to inspect the shaft and housing for wear or damage before installation to ensure a proper fit and long service life.

Quality Assurance and Warranty Information

National transmission seals are manufactured to meet industry standards for durability and performance. The 710709 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, providing confidence in the product’s reliability for automotive transmission applications.