Re: 8 lug conversion kit?
I know that '78 and '79 F250s got a 8 lug Dana44, You'll need to find both Disc and Hub. assuming the rotor was the same size - if it wasn't you'll need the brake hardware and the hanger also. Around here 4x4 F trucks are few and far between so good luck, I don't know of any conversion kits, but I've never looked.
'78 Custom 4"Lift 36"HummV tires Factory Rollbar-QuadShock-4Speed. '78XLT A/C, Cruise. '83Custom A/C and sweet paintjob.