National 710549 Differential Pinion Seal - Front Outer

National 710549 Differential Pinion Seal Overview

The National 710549 differential pinion seal is engineered for reliable sealing performance in driveline applications. Designed specifically for Chevrolet, GMC, Hummer, and Isuzu models including the Canyon, Colorado, H3, H3T, i-350, and i-370, this seal helps maintain optimal differential function by preventing oil leaks.

• Inside diameter: 1.682 inches (42.970 mm)
• Outside diameter: 2.668 inches (67.770 mm)
• Flanged outside diameter: 3.110 inches (78.990 mm)
• Thickness/width: 0.383 inches (9.730 mm)
• Material: durable fluoro-elastomer
• Helix type: counter-clockwise spiral lip design for effective sealing
• Housing bore diameter: 2.660 inches (67.570 mm)
• Part number: 710549, series 710500

Technical Details and Material Specifications

This differential pinion seal features a fluoro-elastomer construction, providing resistance to heat, oil, and wear commonly encountered in automotive driveline environments. The counter-clockwise spiral lip design enhances sealing efficiency by directing lubricant inward and contaminants outward. With precise dimensions including a 1.682-inch inside diameter and a 2.668-inch outside diameter, the seal fits securely within the housing bore of 2.660 inches, ensuring a tight, leak-free installation.

Compatible Vehicles and Applications

The National 710549 differential pinion seal is compatible with a range of vehicles, specifically Chevrolet Canyon and Colorado, GMC Canyon and Colorado, Hummer H3 and H3T, and Isuzu i-350 and i-370 models. This part is designed to replace worn or damaged seals in the differential pinion area, maintaining proper lubrication and preventing contamination.

• Prevents oil leaks from the differential pinion shaft
• Protects differential components from dirt and debris ingress
• Maintains proper lubrication for smooth driveline operation
• Reduces risk of differential damage due to seal failure
• Helps avoid costly repairs related to fluid loss

Installation Notes and Tips

When installing the National 710549 differential pinion seal, ensure the housing bore and shaft surfaces are clean and free of debris. Use appropriate tools to press the seal evenly into the bore without distortion. Verify the seal’s orientation matches the counter-clockwise spiral lip design to optimize sealing performance. Lubricate the seal lip lightly with differential oil before installation to reduce initial wear.

Quality Assurance and Warranty

Manufactured by National, a recognized brand in driveline sealing systems, the 710549 differential pinion seal meets industry standards for durability and performance. The fluoro-elastomer material and precise engineering contribute to long service life under normal operating conditions. Warranty coverage details should be confirmed with the original equipment manufacturer or distributor.