National 710712 Automatic Transmission Torque Converter Seal

Automatic Transmission Torque Converter Seal

National 710712 is an automatic transmission torque converter seal built for precise sealing at the transmission housing. It uses a fluoro-elastomer sealing material and a clockwise-spiral lip design to help maintain a consistent seal in Ford 6F35 transmission applications.

With dimensions of 1.561 in. shaft diameter, 2.570 in. outside diameter, and 0.314 in. width, this seal is sized for accurate fitment in the specified transmission bore. National 710712 is a direct-fit sealing component for service work on Ford, Lincoln, Mazda, and Mercury vehicles equipped with the 6F35 transmission.

Key Features

• Automatic transmission torque converter seal for transmission sealing service
• Fluoro-elastomer material for durability in transmission fluid environments
• Clockwise-spiral lip design for controlled sealing contact
• Inside diameter: 1.561 in. / 39.649 mm
• Outside diameter: 2.570 in. / 65.278 mm
• Flanged outside diameter: 2.839 in. / 72.100 mm
• Housing bore: 2.565 in. / 65.151 mm
• Width: 0.314 in. / 7.976 mm
• National 710712 part number for catalog and service matching

Detailed Description

National 710712 is part of the 710700 series and is identified as an oil seal for automatic transmission torque converter service. The seal dimensions and flanged profile are engineered for the listed housing bore and shaft size, helping support a proper seal interface during transmission repair. This part cross-references Timken SL260148 for the same application.

Compatible With Ford Escape, Ford Explorer, Ford Fusion, Lincoln MKC, Lincoln MKX, Lincoln MKZ, Mazda Tribute, Mercury Mariner, and Mercury Milan applications that use the Ford 6F35 transmission. Search terms such as Ford Escape 6F35 transmission torque converter seal, Lincoln MKX automatic transmission seal, and National 710712 transmission seal all point to this service part.

What It Helps Address

• Transmission fluid leakage at the torque converter seal area
• Seal wear from age, heat, and fluid exposure
• Loss of sealing integrity during transmission service
• Fitment issues when replacing a worn 6F35 transmission seal
• Noise or drivability concerns related to transmission fluid loss

Installation Notes and Tips

Verify shaft diameter, housing bore, and seal orientation before installation. The clockwise-spiral lip design should be installed in the correct direction for the application. Clean the bore and sealing surface thoroughly, and inspect the torque converter and transmission components for wear before fitting the new seal. Confirm vehicle application by transmission type, especially on Ford Escape, Ford Explorer, and Lincoln MKX models with the Ford 6F35 transmission.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop sealing components for modern vehicle service needs. National 710712 reflects that focus with application-specific dimensions and material selection for transmission sealing performance.