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I could be wrong here but I believe ALL F250's from 67-77.5 had divorced cases. I'm sure someone somewhere out there will say "my such and such Ford came with a married case stock" but that's beside the point. A "highboy" (which BTW is not an official name given by Ford) is simply an F250 built from 67-77.5. They were called highboys because of the taller stance they had but that's the way ALL of those F250's came.
i found a website yesterday that listed f250 4x4 highboys and lowboys in the same year range. If you do a google search for 77 highboy it is the return listed as template.
That would be because 77 was the split. Up to 77.5 were the old style F250's, after 77.5 came the new lower style F250's. You commonly see the new style listed as "78-79" but in reality they started making them in 77. There were a lot of changes made at this time in the Ford trucks. Ford never offered a "highboy" or "lowboy", just an F250 and the year you own will determine if it sat higher or if it has the standard height.
yea, ivan's got it right. i've seen 1 76 f250 with a married tcase and an automatic transmission. also had full time 4x4. had the ranger package and carpeting and a\c. a very rare truck i think, i would have bought it if it were at all saveable, the frame and body were toast. the thing i thought was odd was it sat much lower than my 75. i just thought this was very odd since they both are considered "highboys". although my truck was supposedly built by the fire dept to have a suspension that could carry some serious weight.