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[updated:LAST EDITED ON 01-Apr-02 AT 07:29 PM (EST)]My 2WD 1975 SuperCab has disc brakes--I always assumed they were stock. My 1973 Shop Manual indicates you could get disc brakes on the 2WD models of the F100, F250 & F350. Good luck.
EDIT: And none of this helps you a bit does it? I don't know the answer to your question & apologize for not reading it more carefully in the first place.
find a later model f100 with the disc brakes. youl lneed to change your proportioning valve and mastery cylinder with units made for disc brakes, otherwise youll have alot of problems.
go to bronco.com they have in thier tech articals they have a step by step artical on how to do this check it out I had a 77 and the axle had been swaped when I bought it so heres the sit