National 710546 Automatic Transmission Output Shaft Seal - Left

Automatic Transmission Output Shaft Seal for 6F50/6F55 Applications

National 710546 is an automatic transmission output shaft seal built for metric-fit applications that require a precise seal at the transmission output shaft. It uses a bi-directional lip design and polyacrylate material to help maintain sealing performance in a wide range of Ford, Lincoln, Chevrolet, GMC, Buick, Cadillac, and related vehicles.

Compatible With 2007-2019 Ford Edge, 2008-2017 Chevrolet Equinox, and 2013-2019 Lincoln MKZ applications, this seal is sized for a 35.000 mm shaft and a 71.000 mm housing bore. The National 710546 part number is also referenced in OE-style replacement searches for several 6F50 and 6F55 transmission applications.

Key Features

• Automatic transmission output shaft seal for metric applications
• Bi-directional lip design for sealing in either rotation direction
• Polyacrylate construction for transmission sealing service
• Inside diameter: 1.378 in. / 35.000 mm
• Outside diameter: 2.807 in. / 71.300 mm
• Flanged outside diameter: 3.055 in. / 77.600 mm
• Width: 0.512 in. / 13.000 mm
• Housing bore: 2.795 in. / 71.000 mm
• National 710546 / Series 710500 / Type 74

Product Details

National 710546 is an oil seal for the transmission output shaft area, where consistent sealing is critical to keeping fluid contained and protecting surrounding components. The metric dimensions and bi-directional lip design make it a direct-fit style seal for many left-position applications across Ford 6F50 and 6F55 transmission platforms, plus related GM and Lincoln vehicles. National has supplied sealing products for decades, and this seal reflects that focus on dimensional accuracy and modern transmission service requirements.

This part cross-references Quality-Built 13784 for the same application.

Common Problems This Seal Can Address

• Transmission fluid seepage at the output shaft area
• Wet or oily residue around the transmission housing bore
• Seal wear from age, heat, and fluid exposure
• Leak-related fluid loss that can affect transmission operation
• Service replacement during transmission repair or rebuild work

Installation Notes and Tips

Verify shaft diameter, housing bore, and transmission family before installation. This seal is specified for a 35.000 mm shaft and 71.000 mm housing bore, so accurate measurement matters on Ford Explorer, Ford Edge, Lincoln MKX, and similar applications. Inspect the shaft surface for grooves or damage before installing National 710546, and make sure the sealing surface is clean and free of debris.

For best results, confirm the transmission code and vehicle configuration, especially on models listed with Ford 6F50, Ford 6F55, or GMC 6T75 transmission notes. Proper alignment during installation helps prevent lip damage and premature leakage.

Quality Assurance

National is known for sealing solutions backed by long-term industry experience. The 710546 output shaft seal is engineered to meet the dimensional and material requirements expected in modern automatic transmission service, with a design suited to demanding OE-style replacement use.