I haven't actually tried this, but I don't believe it'll work. The '77 has different-size kingpins, and the spindle is what you'd need to swap over. You could swap over the entire suspension, since it'll be a bolt-on, but then of course you'd have a 5-lug setup in front.
While I agree that 'free' is always good, in this case it's not really going to help you out much. You're just going to have to find an F250 to use as a donor, so that everything will bolt up correctly.
F250 disc brake swap
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re: F250 disc brake swap
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'67 F-100 2WD SWB ~ '69 F-100 4WD SWB w/7" chop ~ 1975 F-250 Ranger XLT Supercab Camper Special



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-> Posting and you! <-a MUST watch for all!!
-O-----O- Keith
'67 F-100 2WD SWB ~ '69 F-100 4WD SWB w/7" chop ~ 1975 F-250 Ranger XLT Supercab Camper Special



My '67 restoration video
-> Posting and you! <-a MUST watch for all!!
- flyboy2610
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re: F250 disc brake swap
NO. I found this out myself this past weekend when I got a set of F250 I-beams and spindles from Keith. The F250 spindles are much beefier than the F150 spindles. I would like to help you with the spindles, but they were from a drum brake equipped truck as well. 

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If you're going to live like there's no hell...............
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Jamie, I had a 72 F250 As a parts truck a while back. It had disc brakes on the front. They were the duel piston type. Maybe you can luck up and find one of these in a yard somewhere and swap them over.
clint
clint
71 F100 SportCustom
460 C6. Disc Brake/Power-steering/automatic Swap. 3.00
1986 Bronco 5.0 AOD
460 C6. Disc Brake/Power-steering/automatic Swap. 3.00
1986 Bronco 5.0 AOD