National 2043 Differential Pinion Seal - Rear Outer

National 2043 Differential Pinion Seal

National 2043 is a differential pinion seal for rear outer applications that require a 1.940-inch shaft diameter, 2.766-inch outside diameter, and 0.500-inch width. Built with nitrile material and Redicoat protection, it is specified for a wide range of GM and GMC axle applications across Chevrolet, GMC, Buick, Cadillac, Pontiac, and Isuzu vehicles.

This seal is a direct-fit option for many rear axle service jobs on Chevrolet Blazer, C1500, K1500, Tahoe, GMC Jimmy, Sonoma, Yukon, and related models. Part number 2043 is also cross-referenced to Wix 46476 for the same application.

Key Features

• National differential pinion seal, part number 2043
• Oil seal construction for rear outer axle service
• Nitrile sealing material for common driveline applications
• Redicoat finish for added sealing surface protection
• Dimensions: 1.940 in. inside diameter, 2.766 in. outside diameter, 0.500 in. width
• Fits housing bore of 2.762 in. and shaft size of 1.940 in.
• Series 2000, Type 47 design

Detailed Description

National 2043 is engineered as a differential pinion oil seal for rear outer positions on GM and GMC axle assemblies. The listed dimensions and nitrile sealing material make it a precise replacement for service work where the original seal has hardened, leaked, or worn from age and mileage. National has supplied sealing solutions for more than 75 years, and this part reflects that focus on dimensional accuracy and modern vehicle coverage.

Fitment includes 1997 Chevrolet Blazer, rear outer; 1997 GMC Jimmy, rear outer; 1995-1996 Chevrolet Tahoe, rear outer; 1995-1996 GMC Yukon, rear outer; and 1973-1981 Pontiac Grand Prix, rear outer, among many other applications. National 2043 also covers 1997 Chevrolet C1500, rear outer and 1997 GMC Sonoma, rear outer for 8.5-inch ring gear AAM axle setups.

Common Repair Uses

• Stops gear oil seepage at the differential pinion area
• Replaces a worn or hardened rear axle seal
• Restores sealing on high-mileage GM rear axle assemblies
• Addresses contamination around the pinion shaft area
• Supports service on 8.5-inch, 8.75-inch, and 8.875-inch ring gear applications listed in fitment

Installation Notes

Verify the shaft diameter, housing bore, and seal width before installation. Clean the bore and shaft surface thoroughly, and inspect the pinion yoke or shaft for grooves that can affect sealing performance. Confirm the axle type, ring gear size, and vehicle notes in the fitment list before ordering, especially on older Chevrolet and GMC platforms where multiple rear axle configurations were used.

For best results, match National 2043 to the exact rear outer application shown for your vehicle. This part number 2043 is listed for a broad range of Chevrolet, GMC, Buick, Cadillac, Pontiac, and Isuzu models, including Chevrolet Blazer, GMC Jimmy, and GMC Yukon applications.

Quality Assurance

National is known for sealing products backed by decades of drivetrain and axle application experience. The 2043 seal uses a nitrile sealing element and Redicoat surface treatment to support consistent sealing performance in the specified applications.

• Brand: National
• Part Number: 2043
• Category: Differential Pinion Seal
• Position: Rear Outer