National 710693 Transfer Case Input Shaft Seal

National Transfer Case Input Shaft Seal Overview

The National 710693 transfer case input shaft seal is engineered to provide reliable sealing performance for select Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab models. Designed with durable fluoro-elastomer material, this oil seal helps maintain transfer case integrity by preventing fluid leaks and contamination.

• Inside diameter options: 1.937 inch (49.200 mm)
• Outside diameter: 2.700 inch (68.580 mm)
• Flanged outside diameter: 2.921 inch (74.200 mm)
• Thickness/width: 0.500 inch (12.700 mm)
• Material: Fluoro-elastomer for enhanced chemical and temperature resistance
• Compatible with transfer case housing bore of 2.683 inch (68.160 mm)

Technical Details and Specifications

The National 710693 transfer case input shaft seal is part of the 710600 series and is constructed from fluoro-elastomer, a material known for its resistance to heat, oil, and wear. The seal features a precise inside diameter of 1.937 inches (49.200 mm) to fit the input shaft snugly, while the outside diameter of 2.700 inches (68.580 mm) ensures a secure fit within the transfer case housing bore of 2.683 inches (68.160 mm). The flanged outside diameter of 2.921 inches (74.200 mm) provides additional sealing surface and stability during operation. With a thickness of 0.500 inches (12.700 mm), this seal balances durability and flexibility to maintain effective sealing under various driving conditions.

Compatible Vehicles and Applications

This transfer case input shaft seal is compatible with a range of vehicles including Buick, Chevrolet, GMC, Isuzu, Oldsmobile, and Saab models. Specifically, it fits transfer cases on models such as the Buick Rainier, Chevrolet Trailblazer and Trailblazer EXT, GMC Envoy, Envoy XL, Envoy XUV, Isuzu Ascender, Oldsmobile Bravada, and Saab 9-7x. The National 710693 seal is designed to maintain transfer case fluid integrity and prevent leaks in these applications.

Common Issues Addressed by the National 710693 Seal

• Prevents transfer case fluid leaks that can lead to low fluid levels and damage
• Reduces contamination ingress to protect internal transfer case components
• Minimizes wear on the input shaft by maintaining proper lubrication
• Helps avoid transfer case overheating caused by fluid loss
• Maintains transfer case performance and longevity

Installation Notes and Tips

When installing the National 710693 transfer case input shaft seal, ensure the transfer case housing bore is clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the fluoro-elastomer material. Verify the seal’s orientation matches manufacturer specifications to ensure proper sealing. It is recommended to inspect the input shaft for wear or damage before installation and replace if necessary to prevent premature seal failure.

Quality Assurance and Warranty

National transfer case seals are manufactured to meet industry standards for durability and performance. The fluoro-elastomer material provides resistance to heat, oil, and chemical exposure commonly encountered in transfer case environments. The 710693 part number is backed by National’s quality control processes to ensure consistent fit and function. Warranty coverage details should be confirmed with the product documentation or supplier.