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1975-1986 Chevrolet K20 Automatic Transmission Extension Housing Seal - National SX-4AAS

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New National extension housing seal (MPN: SX-4AAS) for 1975–1986 Chevrolet K20 automatic transmissions. Direct replacement; interchange includes Timken, SKF, C309, VEMO, King 48-7.

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BrandNational
MPN / Part NumberSX-4AAS 1986 1985 1984 1983 1982 1981
OE NumberTimken SKF C309 VEMO King 48-7
Part TypeAutomatic Transmission Extension Housing Seal
PositionExtension Housing
TransmissionAutomatic

Product Description

New National extension housing seal, manufacturer part number SX-4AAS. Designed as a direct replacement for automatic transmission extension housings on Chevrolet K20 trucks from 1975 through 1986. Interchange references include Timken, SKF, C309, VEMO, and King 48-7. Supplied as one piece. No core charge. 1-year manufacturer warranty.

Product Specifications

BrandNational
TypeAutomatic Transmission Extension Housing Seal
Manufacturer Part NumberSX-4AAS 1986 1985 1984 1983 1982 1981
Manufacturer Warranty1 Year
Interchange Part NumberTimken SKF C309 VEMO King 48-7
Placement on VehicleTransmission > Gaskets Sealing Systems
Compatible MakeChevrolet
Compatible ModelK20
Compatible Year1986 1985 1984 1983 1982 1981 1980 1979 1978 1977 1976 1975
Core ChargeFree - No Core Charge
Fitment TypeDirect Replacement
Bundle Description1 pc National Extension Housing Seal
UPCDoes not apply
Manufacturer Warranty1 Year
Core ChargeFree - No Core Charge
Fitment TypeDirect Replacement
Bundle Description1 pc National Extension Housing Seal
UPCDoes not apply

Vehicle Fitment

YearMakeModelEngineTrimTransmission
1975ChevroletK20Automatic
1976ChevroletK20Automatic
1977ChevroletK20Automatic
1978ChevroletK20Automatic
1979ChevroletK20Automatic
1980ChevroletK20Automatic
1981ChevroletK20Automatic
1982ChevroletK20Automatic
1983ChevroletK20Automatic
1984ChevroletK20Automatic
1985ChevroletK20Automatic
1986ChevroletK20Automatic

Always compare the part number and listed specifications with your original part before ordering.