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The basic definition seems to be:
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A Hiboy is a Ford truck that came from the factory as having the following:
- Built from 1967 thru 1977.5.
- F-250.
- 4x4.
- Divorced transfer case.
Trucks that are NOT considered a Hiboy are:
- Any truck built after mid-1977. It goes by Consecutive Build Number in the VIN# anything built starting Y80001 is a 77 1/2. **
- Anything other than an F-250.
There will always be a couple very oddball exceptions but, for the most part, this is it.
You might want to check it out there is alot of other info there.
In mid 1977 Ford made some changes to the F250 4x4 that included widening the frame to 37" and lowering the ride height about 3". I also think they changed the springs from 2 1/2" to 3" width. The rest of donjamer's data also applies.
I always just went off the tcase, that the easiest way for me to tell. But, were there other F250 4x4 trucks from 67-77.5 that WERE NOT highboys? I didn't think there was.....