National 710708 Automatic Transmission Output Shaft Seal - Right Outer

Automatic Transmission Output Shaft Seal

National 710708 is an automatic transmission output shaft seal built for metric applications that require a precise sealing surface and stable fit. It uses a polyacrylate construction and a bi-directional lip design to help maintain sealing performance at the transmission output shaft.

Compatible With select Ford Fusion, Lincoln MKZ, Mazda CX-7, Mazda CX-9, Mercury Milan, and Hyundai Veracruz applications with Aisin TF-81-SC or TF-82SC transmissions. National 710708 is also cross-referenced to SKF 21564A for the same application.

Key Features

• Part number: 710708
• Automatic transmission output shaft seal / oil seal
• Bi-directional lip design
• Polyacrylate sealing material
• Metric dimensions for proper housing and shaft fit
• Inside diameter: 2.520 in. / 64.000 mm
• Outside diameter: 3.118 in. / 79.200 mm
• Width: 0.315 in. / 8.000 mm
• Housing bore: 3.110 in. / 79.000 mm

Detailed Description

National 710708 is part of the 710700 series and is engineered as a metric automatic transmission output shaft seal for the right outer position on listed applications. The seal measures 64.000 mm inside diameter, 79.200 mm outside diameter, and 8.000 mm width, giving it the dimensional accuracy needed for a secure transmission case and shaft interface. Its polyacrylate material is selected for sealing performance in transmission service, while the bi-directional lip design helps maintain contact at the shaft surface.

This part is used in select 2007-2012 Ford Fusion, 2007-2011 Mercury Milan, 2007-2012 Lincoln MKZ, 2007-2012 Hyundai Veracruz, 2008-2012 Mazda CX-7, 2008-2012 Mazda CX-9, and 2013 Mazda CX-9 vehicles with the specified Aisin transmission variants. National 710708 also cross-references Timken SL260117 for the same application.

What It Helps Address

• Transmission fluid leakage at the output shaft seal
• Fluid seepage around the transmission housing bore
• Seal wear from age, heat, and normal drivetrain operation
• Loss of sealing integrity at the right outer output shaft location
• Fitment issues when replacing a worn OE-style transmission seal

Installation Notes and Tips

Verify the transmission model, position, and seal dimensions before installation. Confirm the housing bore and shaft measurements match the listed specifications: 79.000 mm housing bore and 64.000 mm shaft diameter. Clean the sealing surface and inspect the shaft for wear or scoring before installing the new seal. Proper alignment during installation helps prevent lip damage and premature leakage.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop sealing components for modern vehicle applications. The 710708 reflects that focus with metric sizing, a bi-directional lip profile, and application-specific fitment for listed Ford, Lincoln, Mazda, Mercury, and Hyundai models.