National 710507 Differential Pinion Seal - Rear Outer

Overview of National 710507 Differential Pinion Seal

The National 710507 differential pinion seal is engineered to provide reliable sealing performance for driveline components. Designed specifically for select Cadillac, Chevrolet, GMC, and Hummer models, this oil seal helps maintain proper lubrication and prevents fluid leaks in the differential assembly.

• Inside diameter: 2.088 inches (53.040 mm)
• Outside diameter: 2.915 inches (74.040 mm)
• Flanged outside diameter: 3.309 inches (84.050 mm)
• Thickness: 0.500 inches (12.700 mm)
• Material: Durable nitrile rubber for resistance to oil and wear

Technical Specifications and Design Details

The National 710507 differential pinion seal features a precise fit with an inside diameter of 2.088 inches (53.040 mm) and an outside diameter of 2.915 inches (74.040 mm), ensuring compatibility with the housing bore measuring approximately 2.911 inches (73.940 mm). The flanged outside diameter of 3.309 inches (84.050 mm) provides additional sealing surface and secure installation. Constructed from nitrile material, this seal offers effective resistance to oil, heat, and wear, making it suitable for demanding driveline environments. The 0.500 inch (12.700 mm) thickness balances durability with flexibility to maintain a tight seal around the pinion shaft.

Compatible Vehicles and Applications

This differential pinion seal is compatible with a range of GM vehicles, including:

• Cadillac Escalade, Escalade ESV, Escalade EXT
• Chevrolet Avalanche 2500, C1500, C1500 Suburban, C2500, C2500 Suburban, Express 2500, Silverado 1500, Silverado 1500 Classic, Silverado 1500 HD, Silverado 1500 HD Classic, Silverado 2500, Silverado 2500 HD, Suburban 1500, Suburban 2500, Tahoe
• GMC Sierra 1500, Sierra 1500 Classic, Sierra 1500 HD, Sierra 1500 HD Classic, Sierra 2500, Sierra 2500 HD, Savana 2500, Yukon, Yukon XL 1500, Yukon XL 2500
• Hummer H2, H3, H3T

Common Issues Addressed by the National 710507 Seal

• Prevents differential oil leaks that can cause driveline damage
• Maintains proper lubrication of the pinion shaft
• Reduces contamination ingress into the differential housing
• Minimizes wear on the pinion shaft and bearings
• Helps avoid costly repairs due to seal failure

Installation Notes and Tips

Ensure the housing bore and pinion shaft are clean and free of debris before installation. Use appropriate tools to press the seal evenly into the housing bore without distortion. Verify the seal’s orientation matches the original part to maintain proper sealing function. Lubricate the seal lip lightly with gear oil to reduce initial wear during startup. Check for leaks after installation and during initial operation.

Quality Assurance and Warranty

National manufactures the 710507 differential pinion seal to meet industry standards for durability and performance. Made from high-quality nitrile material, this seal is designed to withstand typical operating conditions in GM trucks and SUVs. While specific warranty details may vary, National products generally come with a limited warranty against manufacturing defects to ensure customer confidence in product reliability.