National 710970 Manual Transmission Shift Shaft Seal

Overview of National 710970 Manual Transmission Shift Shaft Seal

The National 710970 manual transmission shift shaft seal is designed to provide reliable sealing performance for select Ford, Mazda, and Mercury vehicles. Engineered with nitrile material, this oil seal helps maintain transmission integrity by preventing fluid leaks around the shift shaft.

• Inside diameter: 0.630 inch (16.000 mm)
• Outside diameter: 0.992 inch (25.200 mm)
• Thickness: 0.236 inch (6.000 mm)
• Overall width with side lip: 0.354 inch (9.000 mm)
• Sealing material: durable nitrile for resistance to oil and wear
• Compatible with Ford Contour, Cougar, Fiesta, Focus, Mystique, Tracer, and Mazda and Mercury models

Detailed Product Description

This National 710970 shift shaft seal is part of the 710900 series, crafted from nitrile material known for its oil resistance and durability under transmission operating conditions. The seal’s precise dimensions, including a 0.630 inch inside diameter and 0.992 inch outside diameter, ensure a secure fit within the housing bore of 0.984 inch (25.000 mm). The 0.236 inch thickness and 0.354 inch overall width with side lip provide effective sealing to prevent transmission fluid leaks and contamination.

Designed specifically for manual transmissions, this shift shaft seal is compatible with various Ford, Mazda, and Mercury models such as the Ford Focus, Fiesta, Contour, Cougar, Mystique, and Tracer. Using the correct seal like the National 710970 helps maintain transmission performance and longevity by protecting internal components from fluid loss and external debris.

Common Applications and Problem Solving

• Prevents manual transmission fluid leaks around the shift shaft
• Reduces risk of contamination entering the transmission housing
• Helps maintain proper transmission pressure and function
• Addresses wear and tear issues in older or high-mileage vehicles
• Replaces damaged or degraded seals to restore transmission reliability

Installation Notes and Tips

• Ensure the housing bore and shaft are clean and free of debris before installation
• Use appropriate tools to avoid damaging the nitrile seal during installation
• Verify the seal orientation matches the original part for proper sealing
• Check shaft and bore dimensions to confirm compatibility with the 0.630 inch shaft diameter and 0.984 inch housing bore
• Lubricate the seal lightly with transmission fluid to ease installation and prevent damage

Quality Assurance and Warranty

National transmission seals are manufactured to meet industry standards for durability and performance. The 710970 shift shaft seal is made from high-quality nitrile material to resist oil degradation and wear. While specific warranty details may vary, National products typically come with a limited warranty against defects in material and workmanship to ensure customer confidence in product reliability.