The F-Series trucks started in 1948 and were designated F-1 through F-8.
F-1 = 1/2-ton weight capacity (payload) in the bed.
F-2 = 3/4-ton
F-3 = 3/4 ton heavy duty
F-4 = 1-ton
F-5 = 1-1/2-ton
F-6 = 2-ton.
F-7 and F-8 were "Big Job" trucks like fire trucks etc.
These designations were replaced in 1953 by the 3-digit nomenclature we are familiar with today.
F-100 was the new 1/2-ton
F-250 replaced the F-2 and F-3
F-350 replaced the F-4
F-5 and F-6 became the F-500 and F-600. The F-7 and F-8 were replaced with F-700, F-750, and F-800. And the F-900 was introduced.
These designations would remain until 1975 when the F-150 was introduced as a heavy-half-ton. The F-100 model was retired in 1984.
These designations are purely academic today as the current F-150 has a payload capacity of just short of 2,000 lbs and can tow (theoretically) 14,000 lbs (powertrain dependent).
cool info. thank you.
OK thanks, and you probably see where I was going with the question. He tried to pull 1.5 tons with a 0.5 ton payload truck. I am sure it can do it (gas or electric), but, with a lot more energy required.