National 8660S Wheel Seal - Rear

National 8660S Wheel Seal Overview

The National 8660S wheel seal is engineered for reliable driveline sealing in a variety of vehicles including Buick, Chevrolet, Ford, and Jeep models. Designed with a bi-directional lip and nitrile material, this oil seal ensures effective protection against contaminants and fluid leaks.

• Inside diameter: 1.399 inches (35.530 mm)
• Outside diameter: 2.296 inches (58.320 mm)
• Width: 0.460 inches (11.680 mm)
• Bi-directional lip design for enhanced sealing
• Constructed from durable nitrile material
• Redicoat surface treatment for corrosion resistance
• Fits a wide range of vehicles including Chevrolet Blazer, Ford Ranger, Jeep Wrangler, and more

Detailed Product Description

The National 8660S wheel seal is part of the 8000 series and is designed to provide a secure seal between the axle shaft and housing bore, preventing oil leakage and contamination ingress. Its bi-directional lip design improves sealing performance under varying rotational directions and pressures. The nitrile compound offers resistance to heat, oil, and wear, making it suitable for demanding automotive driveline applications. The seal’s precise dimensions, including a 1.399-inch shaft diameter and 2.296-inch outside diameter, ensure a proper fit in compatible housings with a bore diameter of approximately 2.292 inches (58.220 mm).

Compatible Vehicles and Applications

This wheel seal is compatible with a broad range of makes and models, including Buick, Cadillac, Chevrolet, Chrysler, Dodge, Ford, GMC, Isuzu, Jeep, Lincoln, Mazda, Mercury, Oldsmobile, and Pontiac. Common applications include models such as the Chevrolet Blazer, Ford Ranger, Jeep Wrangler, Pontiac Grand Prix, and Buick LeSabre, among others. The National 8660S is suitable for use in driveline and axle assemblies where a reliable oil seal is required.

Common Issues Addressed by the National 8660S Wheel Seal

• Prevents axle oil leaks that can cause driveline damage
• Blocks dirt, water, and debris from entering the axle housing
• Reduces premature wear on axle shafts and bearings
• Maintains proper lubrication within the axle assembly
• Helps avoid costly repairs related to seal failure

Installation Notes and Tips

• Ensure the housing bore and shaft are clean and free of debris before installation
• Use appropriate tools to avoid damaging the seal lips during installation
• Verify the seal orientation matches the bi-directional lip design for optimal performance
• Check for proper fitment with the 1.399-inch shaft and 2.292-inch housing bore dimensions
• Apply a light coating of compatible lubricant on the seal lip before installation

Quality Assurance and Warranty

Manufactured by National, a trusted brand in automotive sealing solutions, the 8660S wheel seal undergoes rigorous quality control to meet industry standards. The seal features a Redicoat corrosion-resistant surface treatment to extend service life. While specific warranty details may vary, National products typically come with a limited warranty against manufacturing defects to ensure reliability and customer confidence.