National 710645 Transfer Case Output Shaft Seal - Front

National Transfer Case Output Shaft Seal Overview

The National 710645 transfer case output shaft seal is engineered to provide reliable sealing performance for a range of GM vehicles. Designed with durable polyacrylate material, this oil seal helps maintain proper lubrication and prevents fluid leaks in transfer cases of select Cadillac, Chevrolet, Dodge, GMC, Oldsmobile, Pontiac, and Saturn models.

• Inside diameter: 1.937 inches (49.2 mm)
• Outside diameter: 2.700 inches (68.58 mm)
• Thickness/width: 0.512 inches (13 mm)
• Sealing material: Polyacrylate for enhanced durability
• Compatible with housing bore size of 2.683 inches (68.16 mm)

Detailed Product Description

The National 710645 transfer case output shaft seal is part of the 710600 series, designed specifically to fit transfer cases in various GM trucks and SUVs. Its polyacrylate sealing material offers resistance to heat, oil, and wear, ensuring a tight seal around the output shaft. With precise dimensions including a 1.937-inch inside diameter and a 2.700-inch outside diameter, this seal fits securely within the housing bore of 2.683 inches. The 0.512-inch thickness provides a robust barrier against fluid leaks, helping maintain transfer case integrity and performance.

Compatible Vehicles and Applications

This transfer case output shaft seal is compatible with a wide range of GM vehicles, including:

• Cadillac Escalade, Escalade ESV, Escalade EXT
• Chevrolet Avalanche 1500, Avalanche 2500, Silverado 1500, Silverado 2500, Silverado 3500, Suburban 1500, Suburban 2500, Tahoe
• Dodge Ram 1500
• GMC Sierra 1500, Sierra 2500, Sierra 3500, Yukon, Yukon XL 1500, Yukon XL 2500
• Oldsmobile, Pontiac, Saturn models such as Astro, Blazer, Bravada, Equinox, Jimmy, S10, Safari, Sonoma, Torrent, Vue

Common Issues Addressed by This Seal

• Prevents transfer case fluid leaks that can cause damage
• Reduces contamination of transfer case internals by dirt and debris
• Maintains proper lubrication of the output shaft
• Helps avoid costly transfer case repairs due to seal failure
• Ensures smooth operation of four-wheel drive and all-wheel drive systems

Installation Notes and Tips

• Verify the transfer case model and shaft dimensions before installation
• Clean the housing bore thoroughly to remove old sealant and debris
• Use appropriate tools to press the seal evenly into the housing bore
• Inspect the output shaft for wear or damage prior to installing the new seal
• Apply a light coating of transfer case fluid on the seal lip to ease installation

Quality Assurance and Warranty

National transfer case output shaft seals are manufactured to meet OEM specifications for fit and function. The polyacrylate material ensures durability under typical operating conditions. While specific warranty details may vary, National products generally come with a limited warranty against defects in material and workmanship to provide confidence in your purchase.