Mid1977, Ford discontinued using the narrow frame and divorced transfer case for the F250/350 4wd pickups. People then started referring to the 19671977 F250/350 4wd pickups as highboys. There is an incorrect, albeit common, belief that Highboy was an option package available on all 6777 Ford …The Ford FSeries is a series of trucks marketed and manufactured by Ford.In production since 1948, the FSeries is a range of lightduty trucks marketed as fullsize pickup trucks, slotted above the compact Ford Ranger in the Ford truck model range. Since 1999, the FSeries also includes the heavierduty Super Duty series, which includes pickup trucks, chassis cab trucks, and mediumduty trucks.
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