National 480821 Steering Gear Worm Shaft Seal

Steering Gear Worm Shaft Seal for Classic Trucks

The National 480821 steering gear worm shaft seal is a precision oil seal for manual steering gear applications. It is built with nitrile sealing material and Redi-Coat surface treatment to support a reliable seal at the steering gear housing.

With a 0.750 inch shaft size, 1.316 inch outside diameter, and 0.250 inch width, this seal is sized for a range of Jeep, Ford, Chevrolet, and GMC steering gear applications. National has supplied sealing solutions for decades, and the 480821 is part of its 480000 series.

Key Features

• Part number: 480821
• Steering gear worm shaft seal / oil seal
• Nitrile sealing material for steering gear sealing applications
• 0.750 inch inside diameter and 1.316 inch outside diameter
• 0.250 inch width for compact steering gear packaging
• Redi-Coat treated surface
• Series 480000, Type 48

Product Details

The National 480821 is a steering gear worm shaft seal used to retain lubricant and help keep contaminants out of the steering gear assembly. Its nitrile construction and dimensional profile make it a direct-fit sealing component for many older manual steering systems, including applications found in Jeep Grand Cherokee, Wrangler, CJ5, CJ7, and Scrambler models, as well as Chevrolet S10 and GMC Sonoma trucks. It also cross-references Dorman - HELP 47291 for the same application.

This seal is specified with a 19.050 mm shaft diameter, 33.430 mm outside diameter, and 6.350 mm width. National’s sealing expertise and long-running product development support consistent fitment for steering gear service work on vintage and late-model classic vehicles.

What This Seal Helps Address

• Steering gear oil seepage at the worm shaft area
• Contamination entering the steering gear housing
• Loss of lubricant from worn or hardened seals
• Steering gear service on manual steering systems
• Seal replacement during steering box rebuilds

Installation Notes and Fitment

Fits 1993-1996 Jeep Grand Cherokee, N/A. Fits 1987-1995 Jeep Wrangler, N/A. Fits 1991-1993 Chevrolet S10, N/A. Fits 1991-1993 GMC Sonoma, N/A. Fits 1975-1982 Ford F-150, N/A. Fits 1975-1977 Ford Bronco, N/A. Fits 1959-1983 Jeep CJ5, N/A.

Before installation, verify shaft diameter, housing bore, and seal width against the steering gear being serviced. Clean the bore thoroughly, inspect the shaft for wear or scoring, and confirm the steering box uses the correct manual steering gear seal profile. This part number is also listed for multiple Chevrolet, GMC, Ford, and Jeep steering gear applications with sector shaft seal requirements.

Quality Assurance

National has built its reputation on sealing products for more than 75 years, with engineering focused on modern and legacy vehicle service needs. The 480821 reflects that sealing experience in a steering gear application.