National 710664 Transfer Case Input Shaft Seal

Overview of National Transfer Case Input Shaft Seal 710664

The National 710664 Transfer Case Input Shaft Seal is engineered to provide reliable sealing performance for a range of GM and Ford vehicles. Designed with durable polyacrylate material, this oil seal helps maintain transfer case integrity by preventing fluid leaks and contamination.

• Inside diameter: 1.886 inches (47.900 mm)
• Outside diameter: 2.756 inches (70.000 mm)
• Thickness/width: 0.472 inches (12.000 mm)
• Sealing material: Polyacrylate for enhanced durability
• Compatible housing bore: 2.750 inches (69.850 mm)

Technical Details and Specifications

The National 710664 transfer case input shaft seal is part of the 710600 series, designed specifically for transfer case applications requiring precise sealing dimensions. The seal’s polyacrylate construction offers resistance to heat, oil, and wear, ensuring long-lasting performance in demanding automotive environments. With an inside diameter of 1.886 inches and an outside diameter of 2.756 inches, this seal fits securely within the housing bore of 2.750 inches, providing a tight seal around the input shaft to prevent oil leakage.

Compatible Vehicles and Applications

This transfer case input shaft seal is compatible with a variety of GM and Ford models, including Cadillac Escalade, Escalade ESV, Escalade EXT, Ford Expedition, Express 1500 and 2500, F-150, Lincoln Navigator, Mark LT, GMC Sierra 1500, Yukon, Yukon XL 1500 and 2500, Suburban 1500 and 2500, Tahoe, and Savana 1500 and 2500. The part number 710664 ensures proper fitment and function within these specific transfer case systems.

Common Issues Addressed by the National 710664 Seal

• Prevents transfer case fluid leaks that can cause damage
• Reduces contamination from dirt and debris entering the transfer case
• Maintains proper lubrication of the input shaft
• Minimizes wear on transfer case components due to fluid loss
• Helps avoid costly repairs related to seal failure

Installation Notes and Tips

When installing the National 710664 transfer case input shaft seal, ensure the housing bore is clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the sealing lip. Verify the seal’s orientation matches the manufacturer’s specifications to maintain optimal sealing performance. It is recommended to inspect the input shaft for wear or damage before installation to ensure a proper seal.

Quality Assurance and Warranty

National transfer case seals are manufactured to meet industry standards for durability and performance. The polyacrylate material used in the 710664 seal provides resistance to heat and oil degradation. While specific warranty details may vary, National typically offers coverage against manufacturing defects to ensure customer confidence in the product’s reliability.