Timken 204005S Steering Knuckle Seal - Front, Front Lower or Front Upper

Timken 204005S Steering Knuckle Seal

The Timken 204005S steering knuckle seal is built for front axle sealing on classic Ford, Chevrolet, and GMC 4x4 applications. It uses a precision sealing design to keep lubricant in place while helping block dirt, water, and road debris from entering the steering knuckle area.

With S-Nitrile construction, a reinforced outer case, and a ribbed rubber inner diameter, this seal is made to seat securely and handle minor spindle imperfections. It is a direct-fit option for select Dana/Spicer axle applications, including Ford Bronco, Ford F-250, Chevrolet Blazer, Chevrolet K10 Suburban, Chevrolet K20 Suburban, and GMC Jimmy front axle service.

Key Features

• S-Nitrile material for sealing performance in steering knuckle applications
• Reinforced outer case helps resist installation damage and supports durability
• Ribbed rubber inner diameter helps seal minor spindle imperfections
• Internal contamination exclusion system helps block debris entry
• Vent holes promote lubricant flow around the seal lip to reduce heat buildup
• Dimensions: 1.787 in. outside diameter, 1.781 in. housing bore, 1.000 in. shaft diameter, 0.469 in. width

Detailed Description

Timken 204005S is a steering knuckle seal for front axle service where lubricant retention and contamination control are critical. It is sized for select Dana/Spicer 44-series axle applications and is used on vehicles such as the 1966-1972 Ford Bronco front, 1975-1977 Ford F-250 front, 1969-1972 Chevrolet Blazer front, 1968-1972 Chevrolet K10 Suburban front, 1968-1972 Chevrolet K20 Suburban front upper and front lower, and 1970-1972 GMC Jimmy front. This part cross-references National 204005 and Anchor 10035 for the same application. The Timken 204005S seal is a practical choice when servicing a front steering knuckle that needs reliable lubricant control and contamination resistance.

What It Helps Fix

• Gear oil or grease leakage at the steering knuckle
• Contamination entering the front axle seal area
• Seal wear caused by heat buildup around the lip
• Poor sealing on spindles with minor surface imperfections
• Damage from a worn or compromised original seal

Installation Notes and Tips

Verify axle type, housing bore, shaft diameter, and seal width before installation. Clean the bore and spindle surface thoroughly, then install the seal squarely to avoid distortion of the reinforced case. For best results, inspect the spindle and related steering knuckle components for wear, scoring, or contamination before reassembly. Fits 1975-1977 Ford F-250, front; 1969-1972 Chevrolet Blazer, front; 1968-1972 Chevrolet K10 Suburban, front; 1968-1972 Chevrolet K20 Suburban, front upper and front lower; 1966-1972 Ford Bronco, front; and 1970-1972 GMC Jimmy, front.

Quality Assurance

Timken manufactures sealing components with precision-fit designs and contamination control features for axle and steering service. Part number 204005S is built to the listed dimensions and application requirements for the confirmed vehicle fitments above.