National 710706 Automatic Transmission Output Shaft Seal - Right

Automatic Transmission Output Shaft Seal

National 710706 is an automatic transmission output shaft seal built for metric applications that require a precise sealing fit at the transmission housing. It uses a polyacrylate construction and a bi-directional lip design to help maintain a consistent seal around the shaft in Ford, Lincoln, Mazda, and Mercury applications with the Ford 6F35 transmission.

This part cross-references SKF 16066A and Timken SL260139 for the same application.

Key Features

• Automatic transmission output shaft seal for metric applications
• Polyacrylate material for sealing performance in transmission service
• Bi-directional lip design for sealing in either rotational direction
• Inside diameter: 1.654 in. / 42.000 mm
• Outside diameter: 2.843 in. / 72.200 mm
• Flanged outside diameter: 3.146 in. / 79.900 mm
• Thickness: 0.502 in. / 12.750 mm
• Overall width with side lip: 0.616 in. / 15.650 mm
• Housing bore: 2.835 in. / 72.000 mm
• Part description: Oil seal, Series 710700, Type 74

Detailed Description

National 710706 is engineered as an output shaft oil seal for automatic transmissions, with dimensions matched to metric housings and shafts. The seal measures 42.000 mm inside diameter, 72.200 mm outside diameter, and 12.750 mm width, with a 79.900 mm flanged outside diameter for proper seating. Its bi-directional lip design supports sealing at the transmission output shaft where consistent fluid control is critical. This part is listed for 2019 Ford Escape, 2016-2019 Ford Explorer, 2016-2018 Lincoln MKX, 2010-2011 Ford Fusion, 2010-2011 Lincoln MKZ, 2009-2011 Mazda Tribute, 2009-2011 Mercury Mariner, and 2010 Mercury Milan with the Ford 6F35 transmission, and also for 2017-2018 Ford Escape and 2009-2011 Ford Escape at the right position. National has more than 75 years of sealing experience, and this seal reflects that focus on transmission sealing systems.

Common Problems This Seal Can Address

• Transmission fluid leakage at the output shaft area
• Seepage around a worn or hardened shaft seal
• Fluid loss caused by seal lip wear or distortion
• Contamination entering through a compromised seal interface
• Drivability issues related to low transmission fluid level

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal orientation before installation. Clean the sealing surface and inspect the output shaft for grooves, scoring, or corrosion that could affect sealing performance. Confirm vehicle application by year, make, model, and transmission configuration, especially on Ford Escape, Ford Explorer, and Lincoln MKX vehicles equipped with the Ford 6F35 transmission. Proper seating depth and alignment are important to avoid premature leakage.

Quality Assurance

National designs sealing products with current vehicle service requirements in mind and has a long history in the sealing category. Part number 710706 is built to match the listed metric dimensions and application-specific fitment for reliable transmission service.