Some efficiency expert came up with that one. "We need 8 bolt wheels on our HD trucks" "We can save money if we only have 7" Duh! 360° divided by 7 = 51.4285714286°. 360 divided by 8 = 45° Just sayin'
The light duty F-250 and the F-150 both had the same, new body. The 5.4 was the top engine available. The Super Duty F-250 and the new F-350 didn't come out until '99. BTW, that was the first Crew Cab dually that I saw over $40K.