National 2043 Differential Pinion Seal - Rear Outer

National 2043 Differential Pinion Seal Overview

The National 2043 differential pinion seal is engineered to provide reliable sealing performance for a range of GM and related vehicles. Designed with precision nitrile material and Redicoat technology, this oil seal helps maintain differential integrity by preventing leaks and contamination.

• Inside diameter: 1.940 inches (49.280 mm)
• Outside diameter: 2.766 inches (70.260 mm)
• Thickness/width: 0.500 inches (12.700 mm)
• Material: Durable nitrile rubber for resistance to oil and heat
• Redicoat coating for enhanced sealing and installation
• Series 2000, Type 47 design for specific driveline applications

Technical Details and Specifications

The National 2043 differential pinion seal features a 1.940-inch inside diameter and a 2.766-inch outside diameter, fitting precisely into housings with a bore diameter of approximately 2.762 inches (70.150 mm). The 0.500-inch thickness ensures a secure fit and effective sealing against oil leaks. Constructed from nitrile, this seal offers resistance to petroleum-based fluids and high temperatures commonly encountered in driveline environments. The Redicoat finish improves installation by reducing friction and enhancing the seal’s ability to maintain a tight fit over time.

Compatible Vehicles and Applications

This differential pinion seal is compatible with a variety of vehicles including Buick, Cadillac, Chevrolet, GMC, Isuzu, Oldsmobile, and Pontiac models. It is suitable for applications such as the Chevrolet Blazer, C10 Suburban, Camaro, Caprice, Firebird, and GMC Sierra, among others. The National 2043 is designed to meet the sealing requirements of these vehicles’ driveline and axle assemblies, ensuring proper differential function and longevity.

Common Issues Addressed by the National 2043 Seal

• Prevents oil leaks from the differential pinion shaft
• Protects differential components from dirt and debris contamination
• Reduces risk of premature wear due to fluid loss
• Maintains proper lubrication within the differential housing
• Helps avoid costly repairs related to seal failure

Installation Notes and Tips

When installing the National 2043 differential pinion seal, ensure the housing bore is clean and free of debris. Use appropriate tools to press the seal evenly into place without damaging the Redicoat surface. Verify the seal is seated flush with the housing bore to prevent leaks. Lubricate the seal lip lightly with gear oil before installation to reduce initial wear. Follow vehicle-specific service manual instructions for torque specifications and assembly procedures.

Quality Assurance and Warranty

National manufactures the 2043 differential pinion seal to meet industry standards for durability and performance. The use of nitrile material and Redicoat technology supports long service life 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 seal’s reliability for compatible Buick, Cadillac, Chevrolet, GMC, Isuzu, Oldsmobile, and Pontiac models.