National 3553 Steering Knuckle Seal - Front

Steering Knuckle Seal for Front Applications

National 3553 is a steering knuckle seal built for front-end sealing applications on a wide range of Chevrolet, GMC, Oldsmobile, Buick, Cadillac, and Isuzu vehicles. It uses nitrile sealing material and a Redi-Coat finish to support consistent sealing performance in demanding steering and suspension environments.

With OE-style dimensions and a 3000 series design, National 3553 is sized for applications that require a precise fit at the housing bore and shaft interface. This seal is a direct-fit option for front steering knuckle service on vehicles such as the Chevrolet S10, GMC Sonoma, and Chevrolet Blazer.

Key Features

• Part number 3553 steering knuckle seal
• Nitrile sealing material for durable sealing performance
• Redi-Coat finish for improved installation characteristics
• Inside diameter: 2.201 in. / 55.910 mm
• Outside diameter: 2.741 in. / 69.620 mm
• Housing bore: 2.735 in. / 69.470 mm
• Thickness: 0.197 in. / 5.000 mm
• Overall width with side lip: 0.381 in. / 9.677 mm
• National 3553 cross-references Dorman - Autograde 47956 for the same application

Detailed Description

National 3553 is an oil seal-style steering knuckle seal engineered around precise dimensional requirements, including a 2.201-inch shaft diameter, 2.741-inch outside diameter, and 2.735-inch housing bore. The nitrile sealing material is selected for sealing performance in steering and suspension service, while the flanged outside diameter and side-lip width help support proper seating in the housing. This part number 3553 is part of National’s 3000 series and is identified as Type 284.

National has supplied sealing solutions for more than 75 years, and its engineering focus is reflected in the fit and material choices used in this seal. It is a strong match for front steering knuckle service on Chevrolet S10, GMC Sonoma, and Chevrolet Blazer platforms, along with other listed applications including GMC Jimmy, Oldsmobile Bravada, Isuzu Hombre, and several classic Buick, Cadillac, and Oldsmobile models.

What It Helps Address

• Oil leakage at the steering knuckle seal area
• Contamination entering the front steering knuckle assembly
• Wear-related sealing loss at the shaft interface
• Improper sealing caused by a damaged or hardened original seal
• Front-end service needs on Chevrolet S10, GMC Sonoma, and Chevrolet Blazer models

Installation Notes and Tips

Verify shaft, housing bore, and outside diameter measurements before installation to confirm the seal matches the application. Clean the sealing surface and housing thoroughly, and inspect the mating components for wear, scoring, or corrosion that could affect seal life. National 3553 is listed for front position applications only, so confirm the vehicle’s service location before ordering.

Fits 1983-2004 Chevrolet S10, front; fits 1995-2005 Chevrolet Blazer, front; fits 1991-2004 GMC Sonoma, front. Additional listed applications include 1992-2001 GMC Jimmy, 1996-2001 Oldsmobile Bravada, and 1998-2000 Isuzu Hombre, all front position.

Quality Assurance

National is a long-established sealing brand with more than 75 years of experience in the industry. Part number 3553 is built to dimensional specifications that support accurate fitment across the listed front steering knuckle applications, including Chevrolet S10, GMC Sonoma, and Chevrolet Blazer service.