National 710446 Automatic Transmission Torque Converter Seal

Overview of National 710446 Automatic Transmission Torque Converter Seal

The National 710446 automatic transmission torque converter seal is engineered to provide reliable sealing performance for select Ford, Kia, Mazda, and Mercury vehicles. Constructed from durable nitrile material, this oil seal is designed to maintain transmission fluid integrity and prevent leaks in critical drivetrain components.

• Material: High-quality nitrile for resistance to heat and wear
• Inside Diameter: 2.677 inches (68.000 mm)
• Outside Diameter: 3.472 inches (88.200 mm)
• Thickness: 0.315 inches (8.000 mm)
• Helix Type: Clockwise-spiral lip design for effective sealing
• Compatible with housing bore of 3.465 inches (88.000 mm)

Detailed Product Description and Specifications

This National 710446 torque converter seal is part of the 710400 series, designed specifically for automatic transmissions requiring a 35-type seal. The clockwise-spiral lip design enhances sealing efficiency by directing fluid back into the transmission, reducing leakage and contamination. The nitrile construction offers excellent resistance to transmission fluids, heat, and mechanical wear, ensuring durability under demanding operating conditions. With precise dimensions including a 2.677-inch inside diameter and 3.472-inch outside diameter, this seal fits tightly within the housing bore of 3.465 inches, providing a secure and leak-free interface between the torque converter and transmission housing.

Compatible Vehicles and Applications

This torque converter seal is compatible with a range of Ford, Kia, Mazda, and Mercury models, including but not limited to Ford Capri, Escort, and Probe; Kia Rio and Sephia; Mazda 323, 626, Millenia, MPV, MX-3, MX-6, Protege, Spectra, and Tracer; as well as Mercury models such as the Capri and Cougar. The part number 710446 ensures precise fitment for these vehicles, making it a suitable replacement for maintaining transmission performance and preventing fluid leaks.

Common Issues Addressed by the National 710446 Seal

• Prevents automatic transmission fluid leaks around the torque converter
• Reduces contamination of transmission fluid by sealing out dirt and debris
• Maintains proper hydraulic pressure within the transmission system
• Minimizes wear on transmission components caused by fluid loss
• Helps avoid costly transmission repairs due to seal failure

Installation Notes and Tips

When installing the National 710446 torque converter seal, ensure the sealing surface and housing bore are clean and free of debris. Lubricate the seal lip with clean transmission fluid before installation to prevent damage. Use appropriate tools to press the seal evenly into the housing bore without distortion. Verify the seal’s orientation matches the clockwise-spiral lip design to optimize sealing performance. Proper installation is critical to avoid leaks and ensure long-term reliability.

Quality Assurance and Warranty Information

National transmission seals are manufactured to meet strict industry standards for material quality and dimensional accuracy. The 710446 seal undergoes rigorous testing to ensure compatibility and durability in specified vehicle applications. While specific warranty details may vary, National typically offers coverage against manufacturing defects, providing confidence in the product’s reliability for professional and DIY transmission repairs.