National 710636 Automatic Transmission Extension Housing Seal - Transmission Extension Housing To Drive Shaft

Overview of National 710636 Automatic Transmission Extension Housing Seal

The National 710636 automatic transmission extension housing seal is engineered to provide reliable sealing performance for select GM vehicles. Designed with precision dimensions and durable fluoro-elastomer material, this oil seal helps maintain transmission integrity in Cadillac, Chevrolet, and GMC models.

• Inside diameter options: 1.886 inch (47.904 mm)
• Outside diameter: 2.705 inch (68.700 mm)
• Seal thickness: 0.350 inch (8.890 mm)
• Counter-clockwise spiral lip design for enhanced sealing
• Constructed from high-quality fluoro-elastomer material
• Overall width with side lip: 1.417 inch (36.000 mm)
• Compatible with multiple GM trucks and SUVs

Detailed Product Description and Specifications

The National 710636 transmission extension housing seal is part of the 710600 series, designed specifically for automatic transmissions. Its fluoro-elastomer construction offers resistance to heat, oil, and wear, ensuring long-lasting performance under demanding conditions. The seal features a counter-clockwise spiral lip design that improves sealing efficiency by maintaining consistent contact with the shaft and housing bore, which measures approximately 2.697 inches (68.504 mm). The precise inside diameter of 1.886 inches (47.904 mm) matches the shaft size, providing a secure fit to prevent fluid leaks.

Compatible Vehicles and Applications

This transmission extension housing seal is compatible with a range of GM vehicles, including:

• Cadillac Escalade and Escalade ESV
• Chevrolet Avalanche, Silverado 1500, 1500 LD, 2500 HD, 3500 HD, Suburban 1500, Suburban 2500, and Tahoe
• GMC Sierra 1500, 1500 Limited, 2500 HD, 3500 HD, Yukon, Yukon XL, Yukon XL 1500, and Yukon XL 2500

Using the National 710636 seal helps maintain proper transmission fluid containment and prevents contamination, which is critical for the longevity and performance of these vehicles' automatic transmissions.

Common Issues Addressed by the National 710636 Seal

• Prevents transmission fluid leaks from the extension housing
• Reduces risk of contamination entering the transmission system
• Minimizes wear on transmission components caused by fluid loss
• Maintains proper hydraulic pressure within the transmission
• Helps avoid costly transmission repairs due to seal failure

Installation Notes and Tips

Ensure the transmission extension housing and shaft surfaces are clean and free of debris before installing the seal. Proper alignment during installation is critical to avoid damage to the seal lip. Use appropriate tools to press the seal evenly into the housing bore without distortion. Verify the counter-clockwise spiral lip orientation matches the shaft rotation direction for optimal sealing performance.

Quality Assurance and Warranty

National transmission seals are manufactured to meet OEM specifications, using durable fluoro-elastomer materials for resistance to heat and chemical exposure. The 710636 seal undergoes rigorous quality control to ensure dimensional accuracy and sealing reliability. While specific warranty details are not provided, National products are generally backed by industry-standard warranties covering manufacturing defects.