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1977 F250 4WD's (High Boys) before serial number Y20,001 have a divorced transfer case and in-cab fuel tank.
1977 F250 4WD's from serial number Y20,001, 1978/79 F250 4WD's are not High Boys, have a married transfer case, no in-cab fuel tank.
Serial number is the last 6 digits of the VIN
the truck has no vin so the next easyest way to tell is by the gas tank correct? if it has the in cab tank it a highboy/divorced set up
if it has the behind cab tank (non highboy) it has the married set up
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