Ford first introduced the Super Duty line in the 50's. I believe it was 1958. What did it mean? It meant it was a heavy TRUCK. Big engines, 5 or 10 lug bud wheels, or spoke, some had air brakes, and a plethora of drivetrain options. Basically, it replaced the Big Job lineup of the early 50's.What makes a Superduty a Superduty? I thought they just applied the name one year . . . .
Cabs were basically pickup cabs, though many had a raised roof to accommodate taller seats, to see over the big steering wheel, a flat floor, ( no trans hump) a different dash insert, ( more gages), doors were pickup doors, but were often rienforced for West Coast mirrors, front ends were completely different, but used a pickup hood, often with an air scoop.
As it pertains to your truck, Ford decided it sounded cool on TV, and used the name to instill the feeling of a heavy tough truck in potential buyers, near as I can tell.
Pic of 66 model badges.
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