the camper special's and the snow fighter F-250's had the HP60 but they where only two years 78/79, then ford went to the TTB 50 till 85 or 86 then back to the HP60 but only in the F-350. i did find a 77 with a HP60 front and a divorced 205 ( camper special ) but the build date was 11-77 so my guess would be the last months of 77 you could get one.
before 78 ( or late 77 ) they where low pinion dana 60 but with 30 spline inners and ( i think ) 19 spline outers and only in the F-350, i picked up a 76 cause it had a divorced 203 and i noticed the front ( LP60 ) when we got it back to the shop, i sold it cheap but kinda wished i held onto it.
the other odd ball 60 i got was from a 75 or 76 IH ( no paper work ) it had 4.56 gears and was open knuckles, looked just like a chevy or dodge and i thought maybe somone put it in there but after looking thru the 60 bible on pirate they did come thru with them in one of the two years, jason.