National 8460N Differential Pinion Seal - Rear Outer

National 8460N Differential Pinion Seal Overview

The National 8460N differential pinion seal is engineered to provide reliable sealing performance for driveline applications. Designed for select Buick, Chevrolet, GMC, Oldsmobile, and Pontiac models, this oil seal helps maintain proper lubrication and prevents leaks in the differential assembly.

• Inside diameter: 1.739 inches (44.170 mm)
• Outside diameter: 3.270 inches (83.060 mm) with flanged outer diameter
• Thickness/width: 0.593 inches (15.060 mm)
• Housing bore diameter: 2.812 inches (71.420 mm)
• Material: durable polyacrylate compound
• Redicoat coating for enhanced corrosion resistance
• Part of the National 8000 series oil seals

Technical Details and Specifications

The National 8460N differential pinion seal features a precise fit with a 1.739-inch shaft diameter and a 3.270-inch outside diameter, designed to fit housing bores measuring 2.812 inches. Constructed from polyacrylate, this seal offers resistance to heat and wear, ensuring long service life in demanding automotive environments. The flanged outside diameter design improves sealing integrity and ease of installation. Additionally, the Redicoat treatment provides corrosion protection, extending the seal’s durability in harsh conditions.

Compatible Vehicle Applications

This differential pinion seal is compatible with a range of GM vehicles, including Buick, Chevrolet, GMC, Oldsmobile, and Pontiac models. Specific fitments include popular models such as the Chevrolet C10, C1500, Camaro, Caprice, Corvette, and Impala, as well as GMC Jimmy, K5 Blazer, and Oldsmobile Cutlass Supreme. It is suitable for use in driveline and axle assemblies requiring a 1.739-inch shaft seal, ensuring proper sealing and performance.

Common Issues Addressed by the 8460N Seal

• Prevents differential oil leaks that can cause driveline damage
• Maintains lubrication integrity within the pinion area
• Reduces contamination ingress to protect internal components
• Minimizes wear on the pinion shaft and housing bore
• Helps avoid costly repairs due to seal failure or leakage

Installation Notes and Tips

When installing the National 8460N differential pinion seal, ensure the housing bore and shaft are clean and free of debris. Use appropriate tools to press the seal evenly into the housing bore without damaging the flange or sealing lip. Verify the seal orientation matches the original part, with the Redicoat side facing outward for corrosion protection. Lubricate the seal lip lightly with gear oil before installation to reduce initial wear. Proper installation will help maintain optimal sealing performance and extend service life.

Quality Assurance and Warranty

National’s 8460N differential pinion seal is manufactured to meet industry standards for durability and fitment accuracy. The polyacrylate material and Redicoat coating contribute to consistent performance under typical operating conditions. While specific warranty details may vary, National products generally come with a limited warranty against manufacturing defects, providing confidence in the product’s reliability for Buick, Chevrolet, GMC, Oldsmobile, and Pontiac driveline applications.