i had a 47 3ton grain truck that i turned into basicly a 1ton flat bed, BUT to get 5 lug disc up front on a straight axel, i was told to get a car or 1/2ton truck spindle because they use the same king pin set from the cars to 3ton trucks.
so at a swap meet i found an old ford dealer that had a table, had him clairify what i was told, just to be sure. then bought a set of OEM Ford king pins for the truck & traded my old spindles to a guy who wanted them for a set of car spindles that he had.
then i got a disc brake kit for a 40's car/truck, bolted it all up & awaaaaaaaaaaaaaay i went....joe