National 204005 Steering Knuckle Seal - Front

Brand National 204005
Position Front
Housing Bore (Inch) 1.780
Housing Bore (MM) 45.210
Material Nitrile
Outside Diameter (Inch) 1.785
Outside Diameter (mm) 45.340
Part Description Oil Seal
Series 204000
Shaft (Inch) 1.000
Shaft (MM) 25.400
Type 204
Unit of Dimension Inch
Width (Inch) 0.468
Width (mm) 11.890
Fits Chevrolet, GMC, Ford, Dodge, and Fargo · 134 vehicles

Nitrile seal. Helps resist wear and maintain a reliable seal.

Oil seal design. Controls fluid leakage in steering sealing applications.

Premium sealing solutions. Backed by more than 75 years of industry experience.

Cross-references Anchor 10035, Timken 204005S and Walker Exhaust 47980 for the same application. See all 6.

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Steering Knuckle Seal for Front Axles

National 204005 is a steering knuckle seal built with nitrile material and sized for precise housing and shaft dimensions. It is used in front axle applications where a reliable oil seal is needed to help maintain proper sealing at the knuckle area.

  • Part number: 204005
  • Part description: oil seal
  • Material: nitrile
  • Housing bore: 1.780 in. / 45.210 mm
  • Outside diameter: 1.785 in. / 45.340 mm
  • Shaft size: 1.000 in. / 25.400 mm
  • Width: 0.468 in. / 11.890 mm
  • Series: 204000
  • Unit of dimension: inch

Fitment and Application Details

Compatible with front axle applications on classic Chevrolet, GMC, and Ford trucks and SUVs, including 1975-1977 Chevrolet K10 front, 1967-1977 Chevrolet K20 Suburban front, and 1959-1965 Ford F-100 front. This part number 204005 also appears in front axle service applications for Chevrolet Blazer, GMC Jimmy, Ford Bronco, Ford F-250, and Ford F-350 models with the listed Spicer axle and ring gear configurations.

  • Fits 1975-1977 Chevrolet K10, front, with Spicer 44-5F axle(s) and 8.5 inch ring gear.
  • Fits 1967-1977 Chevrolet K10 Suburban, front, with Spicer 44-5F axle(s) and 8.5 inch ring gear.
  • Fits 1975-1977 Chevrolet K20, front, with Spicer 44-5F axle(s) and 8.5 inch ring gear.
  • Fits 1967-1977 Chevrolet K20 Suburban, front, with Spicer 44-5F axle(s) and 8.5 inch ring gear.
  • Fits 1975-1977 Chevrolet K5 Blazer, front, with Spicer 44-5F axle(s) and 8.5 inch ring gear.
  • Fits 1975-1976 GMC Jimmy, front, with Spicer 44-5F axle(s) and 8.5 inch ring gear.
  • Fits 1970-1972 GMC Jimmy, front, with Spicer 44-5F axle(s) and 8.5 inch ring gear.
  • Fits 1974-1975 Ford F-250, front, with Spicer 44-6EF axle(s) and 8.5 inch ring gear.
  • Fits 1974-1975 Ford F-350, front, with Spicer 44-6EF axle(s) and 8.5 inch ring gear.
  • Fits 1969-1974 Chevrolet Blazer, front, with Spicer 44-5F axle(s) and 8.5 inch ring gear.
  • Fits 1971-1972 Ford Bronco, front, with Spicer 44-1F axle(s) and 8.5 inch ring gear.
  • Fits 1966-1972 Ford F-100, front, with Spicer 44-7F axle(s) and 8.5 inch ring gear.
  • Fits 1964-1972 Ford F-250, front, with Spicer 44-6CF axle(s) and 8.5 inch ring gear.
  • Fits 1964-1972 Ford F-250, front, with Spicer 44-6F axle(s) and 8.5 inch ring gear.
  • Fits 1964-1972 Ford F-350, front, with Spicer 44-6CF axle(s) and 8.5 inch ring gear.
  • Fits 1964-1972 Ford F-350, front, with Spicer 44-6F axle(s) and 8.5 inch ring gear.
  • Fits 1966-1971 Ford Bronco, front, with Spicer 30-AF axle(s) and 7.125 inch ring gear.
  • Fits 1964-1971 Ford F-250, front, with Spicer 44-6FHD axle(s) and 8.5 inch ring gear.
  • Fits 1964-1971 Ford F-350, front, with Spicer 44-6FHD axle(s) and 8.5 inch ring gear.
  • Fits 1959-1965 Ford F-100, front, with Spicer 44-F axle(s) and 8.5 inch ring gear.
  • Fits 1959-1965 Ford F-250, front, with Spicer 44-F axle(s) and 8.5 inch ring gear.
  • Fits 1959-1965 Ford F-350, front, with Spicer 44-F axle(s) and 8.5 inch ring gear.

What This Seal Helps Address

  • Oil seepage at the steering knuckle or spindle area
  • Contamination entering the front axle sealing surface
  • Wear-related leakage on older front axle assemblies
  • Service replacement needs on classic Chevrolet, GMC, and Ford 4x4 front ends

Installation Notes and Tips

Verify housing bore, shaft diameter, and width before installation to confirm the seal matches the axle assembly. Clean the sealing surfaces thoroughly and inspect the knuckle, spindle, and shaft for wear or scoring before pressing the seal into place. Confirm the axle configuration and ring gear notes listed in the fitment data for Chevrolet K10, Ford Bronco, and Ford F-250 applications.

Quality Assurance

National has supplied sealing products for more than 75 years and continues to develop sealing solutions for modern and legacy vehicle service needs. This part cross-references Timken 204005S for the same application.

This part fits 134 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelDrive TypePositionNotes
1977ChevroletK10FrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1977ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1977ChevroletK20FrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1977ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1977ChevroletK5 Blazer4WDFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1976ChevroletK10FrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1976ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1976ChevroletK20FrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1976ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1976ChevroletK5 Blazer4WDFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1976GMCJimmy4WDFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1975ChevroletK10FrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1975ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1975ChevroletK20FrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1975ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1975ChevroletK5 Blazer4WDFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1975FordF-2504WDFrontwith Spicer 44-6EF Axle(s); with 8.5 (in) Ring Gear
1975FordF-350Frontwith Spicer 44-6EF Axle(s); with 8.5 (in) Ring Gear
1975GMCJimmy4WDFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1974ChevroletBlazerFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1974ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1974ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1974FordF-2504WDFrontwith Spicer 44-6EF Axle(s); with 8.5 (in) Ring Gear
1974FordF-350Frontwith Spicer 44-6EF Axle(s); with 8.5 (in) Ring Gear
1973ChevroletBlazerFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1973ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1973ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1972ChevroletBlazerFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1972ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1972ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1972FordBroncoFrontwith Spicer 44-1F Axle(s); with 8.5 (in) Ring Gear
1972FordF-1004WDFrontwith Spicer 44-7F Axle(s); with 8.5 (in) Ring Gear
1972FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1972FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1972FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1972FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1972GMCJimmyFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1971ChevroletBlazerFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1971ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1971ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1971FordBroncoFrontwith Spicer 44-1F Axle(s); with 8.5 (in) Ring Gear
1971FordBroncoFrontwith Spicer 30-AF Axle(s); with 7.125 (in) Ring Gear
1971FordF-1004WDFrontwith Spicer 44-7F Axle(s); with 8.5 (in) Ring Gear
1971FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1971FordF-250Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1971FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1971FordF-350Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1971FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1971FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1971GMCJimmyFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1970ChevroletBlazerFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1970ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1970ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1970FordBroncoFrontwith Spicer 30-AF Axle(s); with 7.125 (in) Ring Gear
1970FordF-1004WDFrontwith Spicer 44-7F Axle(s); with 8.5 (in) Ring Gear
1970FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1970FordF-250Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1970FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1970FordF-350Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1970FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1970FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1970GMCJimmyFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1969ChevroletBlazerFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1969ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1969ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1969FordBroncoFrontwith Spicer 30-AF Axle(s); with 7.125 (in) Ring Gear
1969FordF-100Frontwith Spicer 44-7F Axle(s); with 8.5 (in) Ring Gear
1969FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1969FordF-250Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1969FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1969FordF-350Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1969FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1969FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1968ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1968ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1968FordBroncoFrontwith Spicer 30-AF Axle(s); with 7.125 (in) Ring Gear
1968FordF-100Frontwith Spicer 44-7F Axle(s); with 8.5 (in) Ring Gear
1968FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1968FordF-250Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1968FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1968FordF-350Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1968FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1968FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1967ChevroletK10 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1967ChevroletK20 SuburbanFrontFits vehicles with Spicer 44-5F Axle(s) and 8.5 inch Ring Gear.
1967FordBroncoFrontwith Spicer 30-AF Axle(s); with 7.125 (in) Ring Gear
1967FordF-100Frontwith Spicer 44-7F Axle(s); with 8.5 (in) Ring Gear
1967FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1967FordF-250Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1967FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1967FordF-350Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1967FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1967FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1966FordBroncoFrontwith Spicer 30-AF Axle(s); with 7.125 (in) Ring Gear
1966FordF-100Frontwith Spicer 44-7F Axle(s); with 8.5 (in) Ring Gear
1966FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1966FordF-250Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1966FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1966FordF-350Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1966FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1966FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1965FordF-100Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1965FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1965FordF-250Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1965FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1965FordF-250Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1965FordF-350Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1965FordF-350Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1965FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1965FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1964FordF-100Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1964FordF-250FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1964FordF-250Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1964FordF-250Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1964FordF-250Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1964FordF-350Frontwith Spicer 44-6FHD Axle(s); with 8.5 (in) Ring Gear
1964FordF-350Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1964FordF-350FrontFits Axle Spindle Seal for Spicer 44-6CF Axles with 8.5 inch Ring Gear.
1964FordF-350Frontwith Spicer 44-6F Axle(s); with 8.5 (in) Ring Gear
1963FordF-100Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1963FordF-250Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1963FordF-350Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1962FordF-100Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1962FordF-250Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1962FordF-350Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1961FordF-100Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1961FordF-250Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1961FordF-350Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1960FordF-100Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1960FordF-250Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1960FordF-350Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1959FordF-100Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1959FordF-250Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
1959FordF-350Frontwith Spicer 44-F Axle(s); with 8.5 (in) Ring Gear
Directly replaces or cross-references 6 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Anchor — 10035Timken — 204005SWalker Exhaust — 47980C6TZ3171APM204005T811