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1997 Ford went to a metric pattern on the F150 from the previous 5 on 5 1/2" pattern that they used for over 30 years. I'm not sure when the changeover was for the bigger trucks. I changed mine out to a 5 on 4 3/4" pattern to accept aftermarket wheels.
To my knowledge the 97 3/4 tons had the same pattern all the way down to......when ever they should work. i think it was 98 or 99 when they went to the 7 lug light duty 3/4 tons.
dan
The F250 Light duty ran from 97-99. In 2000, the 250 distinction was pulled and it became an F150 with the 7700 weight package.
I don't think the 7700 F150s have the 7 lug wheels, but I could be wrong.