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A while back, on ebay (see where I spend my time?) there was a '78 factory 440 short fat bed, either white or light blue, and I THINK the mag article shown with it mentioned that there were only (74?) less than a hundred 440 trucks?

Seems like there would have been more, counting 250s and 350s.

I know at dad's dealership we only sold one, a short/fat W150 adventurer, guy plowed snow with it commercially, it got rusty, patched, and from there, IDK.

Maybe that is where the 74 number came from?

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The 74 number comes from 1/2 ton short bed 2wd production numbers. There were bunches of 3/4 & 1 ton 440 trucks but very few 1/2 ton 2wd short beds.
As for a "Mighty Truck" I've never heard of it and have never seen any literature on one. It's probably some kind of a dealer package but you never know, would have to have some kind of proof to say it's a factory package.