National 710704 Automatic Transmission Output Shaft Seal - Left

Overview of National 710704 Automatic Transmission Output Shaft Seal

The National 710704 automatic transmission output shaft seal is engineered to provide reliable sealing performance for select Chevrolet, Geo, Scion, and Toyota models. Designed with precision dimensions and durable materials, this oil seal helps maintain transmission integrity and prevent fluid leaks.

• Inside diameter: 1.339 inches (34.000 mm)
• Outside diameter: 2.213 inches (56.200 mm)
• Thickness: 0.335 inches (8.500 mm)
• Overall width with side lip: 0.591 inches (15.000 mm)
• Material: Fluoro-elastomer for enhanced chemical and temperature resistance
• Helix type: Counter-clockwise spiral lip design for effective sealing
• Housing bore diameter: 2.205 inches (56.000 mm)

Technical Details and Design Features

The National 710704 transmission output shaft seal is constructed from fluoro-elastomer, a material known for its resistance to heat, oil, and wear, making it suitable for demanding transmission environments. The seal features a counter-clockwise spiral lip design that helps maintain a tight seal around the output shaft, reducing the risk of fluid leakage. With an inside diameter of 1.339 inches and an outside diameter of 2.213 inches, this seal fits precisely within the housing bore of 2.205 inches, ensuring proper installation and function. The overall width, including the side lip, measures 0.591 inches, providing additional sealing surface area.

Compatible Vehicles and Applications

This automatic transmission output shaft seal is compatible with various models from Chevrolet, Geo, Scion, and Toyota, including the Toyota Corolla, Echo, iQ, Nova, Prizm, and Tercel. The part number 710704 corresponds to the National 710700 series, designed specifically for these vehicles' transmission systems.

Common Issues Addressed by the National 710704 Seal

• Prevents automatic transmission fluid leaks around the output shaft
• Reduces contamination ingress into the transmission system
• Maintains proper lubrication within the transmission
• Helps avoid premature transmission wear due to fluid loss
• Supports consistent transmission performance and longevity

Installation Notes and Tips

Ensure the transmission output shaft and housing bore are clean and free of debris before installation. Verify the correct orientation of the seal, with the spiral lip facing the fluid side to optimize sealing effectiveness. Use appropriate tools to press the seal evenly into the housing bore without distortion. Avoid damaging the lip during installation to maintain sealing integrity.

Quality Assurance and Warranty

National transmission seals are manufactured to meet industry standards for durability and performance. The 710704 seal is part of the 710700 series, known for consistent quality in sealing applications. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in their products.