National 1981 Wheel Seal - Front Inner or Rear

Wheel Seal for Driveline Applications

National 1981 is a metric wheel seal built with nitrile sealing material and sized for precise housing and shaft dimensions. It is used across a wide range of manual transmission and driveline applications, including Nissan Frontier, Toyota Tacoma, Ford Ranger, and Jeep Wrangler fitments.

National has supplied sealing solutions for more than 75 years, and this oil seal reflects that focus on dimensional accuracy and material selection. If you are replacing a worn seal on a Toyota Pickup, Nissan Pathfinder, or Mazda B4000, National 1981 provides the correct metric sizing for the application.

• National part number 1981 for driveline and axle sealing applications
• Nitrile sealing material for dependable oil control
• Metric dimensions: 30.000 mm shaft, 45.000 mm housing bore, 8.000 mm width
• Outside diameter: 45.230 mm; inside diameter: 30.000 mm
• Part description: oil seal, Series 1000, Type 35
• Cross-reference: SKF 11622 for the same application

Detailed Product Information

This seal is specified with a 1.181 inch inside diameter, 1.781 inch outside diameter, and 0.315 inch thickness, making it a metric replacement for select transmission and driveline service needs. It is commonly searched as a wheel seal, but the listed part description identifies it as an oil seal, so it should be matched to the exact shaft and housing dimensions before installation. National 1981 is used in applications such as 1995-2004 Nissan Xterra, 1995-1997 Nissan Pickup, 1995-1996 Mazda B2300, 1997-2002 Jeep Wrangler, and 1995-1995 Toyota Pickup service configurations where the listed transmission notes apply.

Common Problems This Seal Can Address

• Gear oil seepage at the shaft or housing interface
• Contamination entering the sealed driveline area
• Leak-related fluid loss around transmission or axle components
• Wear from age, heat, and repeated shaft rotation
• Noise or driveline service issues caused by degraded sealing surfaces

Installation Notes and Tips

Verify shaft diameter, housing bore, and width against the listed dimensions before installation. Clean the bore and shaft thoroughly, inspect for scoring or corrosion, and confirm the transmission or axle variant noted in the fitment data. For best results, install the seal squarely and avoid damaging the nitrile lip during assembly. Confirm vehicle-specific fitment for applications such as Nissan Frontier, Toyota Tacoma, and Ford Ranger, since several listings depend on transmission code.

Quality Assurance

National is a long-established sealing brand with more than 75 years in the industry, and its product development is focused on current vehicle service requirements. Part number 1981 is built to the stated metric dimensions and material specification for accurate replacement selection.