National 710446 Automatic Transmission Torque Converter Seal

Automatic Transmission Torque Converter Seal

National 710446 is an automatic transmission torque converter seal built for metric applications that require a precise sealing surface. It uses nitrile material and a clockwise-spiral lip design to help maintain a tight seal at the torque converter interface in supported Ford, Mazda, Kia, and Mercury vehicles.

Use this seal when servicing transmissions such as the Jatco F4A-EL and Mazda GF4A-EL found in applications like the Mazda 626, Mazda Protege, and Ford Probe. National 710446 is engineered to match the listed shaft, housing bore, and outside diameter dimensions for a proper service replacement.

Key Features

• Nitrile construction for transmission sealing applications
• Clockwise-spiral lip design
• Metric dimensions for accurate fitment
• Inside diameter: 2.677 in. / 68.000 mm
• Outside diameter: 3.472 in. / 88.200 mm
• Thickness: 0.315 in. / 8.000 mm
• Housing bore: 3.465 in. / 88.000 mm
• Part type: automatic transmission torque converter seal

Detailed Description

National 710446 is part of the 710400 series and is identified as a Type 35 oil seal for automatic transmission service. The seal’s nitrile material and spiral lip profile are selected for sealing performance in rotating applications, while the metric sizing supports accurate replacement in transmissions that call for the specified shaft and bore dimensions. This part cross-references Remy 26145 and 26640 for the same application.

For fitment-focused searches, this seal is used in 1991-2003 Ford Escort with Jatco F4A-EL transmission, 1994-2002 Mazda 626 with Mazda GF4A-EL transmission, and 1990-1998 Mazda Protege with Jatco F4A-EL transmission. It also applies to 2001-2005 Kia Rio, 2000-2004 Kia Spectra, and 1991-1999 Mercury Tracer in the listed transmission configurations. National 710446 is a direct-service sealing component for these automatic transmission applications.

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
• Leak concerns after torque converter or transmission removal
• Replacement needs on vehicles with Jatco F4A-EL or Mazda GF4A-EL transmissions

Installation Notes and Tips

Confirm the transmission code, shaft diameter, housing bore, and seal depth before installation. Inspect the sealing surface for scoring or contamination, and replace the seal if the converter hub or bore shows wear. Clean the bore thoroughly and install the seal squarely to avoid distortion of the lip. Verify the application against the vehicle’s transmission configuration before final assembly.

Quality Assurance

National has supplied sealing solutions for more than 75 years and continues to develop sealing components for modern vehicle service needs. National 710446 reflects that experience with a metric, application-specific design for automatic transmission torque converter sealing.