National 3896 Differential Pinion Seal - Rear Outer

National 3896 Differential Pinion Seal Overview

The National 3896 differential pinion seal is engineered to provide reliable sealing performance for various GM trucks and SUVs. Designed with a nitrile material and a clockwise-spiral lip design, this oil seal helps maintain differential integrity by preventing oil leaks and contamination.

• Inside diameter: 1.940 inches (49.280 mm)
• Outside diameter: 2.914 inches (74.020 mm)
• Width: 0.520 inches (13.210 mm)
• Material: Durable nitrile compound
• Helix type: Clockwise-spiral lip design for effective sealing
• Redicoat finish for enhanced corrosion resistance
• Series: 3000

Technical Details and Specifications

The National 3896 differential pinion seal features a precise fit with a housing bore diameter of 2.909 inches (73.890 mm) and a shaft diameter of 1.940 inches (49.280 mm). Its 0.520-inch thickness ensures a secure seal around the pinion shaft, reducing the risk of oil leakage. The clockwise-spiral lip design improves sealing efficiency by directing oil back into the differential housing, while the nitrile material offers resistance to heat, oil, and wear. The Redicoat coating adds an extra layer of protection against corrosion, extending the service life of the seal.

Compatible Vehicles and Applications

This differential pinion seal is compatible with a range of General Motors vehicles, including Cadillac, Chevrolet, and GMC models. It fits various trucks and SUVs such as the Chevrolet C20, C1500, C2500, K20, K1500, K2500, and their Suburban variants, as well as the Express 2500, Savana 2500, and Fleetwood. The National 3896 is suitable for use in commercial chassis and multiple R and V series models, ensuring broad application across GM's driveline systems.

Common Issues Addressed by the National 3896 Seal

• Prevents oil leaks from the differential pinion shaft
• Reduces contamination ingress into the differential housing
• Minimizes wear on the pinion shaft and housing bore
• Maintains proper lubrication levels within the differential
• Protects against corrosion and environmental damage

Installation Notes and Tips

When installing the National 3896 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 bore without damaging the lip. Verify the seal orientation matches the clockwise-spiral lip design for optimal sealing performance. It is recommended to inspect the pinion shaft for wear or damage before installation and replace if necessary to prevent premature seal failure.

Quality Assurance and Warranty

Manufactured by National, a trusted name in driveline sealing systems, the 3896 differential pinion seal meets industry standards for durability and performance. The product is part of the National 3000 series, known for consistent quality and reliability. This seal includes a Redicoat finish to enhance corrosion resistance, contributing to longer service life. Warranty coverage details are provided by the manufacturer and ensure protection against defects in material and workmanship.