So I can't figure out how others are using these for the high arms
I'm with Steve. Are you sure others are actually using these? Don't remember any other discussions about it myself. Doesn't mean it hasn't been done of course, but I sure don't remember any.
Wouldn't it just be easier to use the existing knuckles and go TRO rather than replace the knuckles to get that higher arm location? Or are you intending to take the high arms and still go TRO and just wanted Ford disc brakes?
unless they work with the chevy disc brakes and not the ford
Possible, but still would require some extra fab work and additional thinking because you can only use the Ford spindle and caliper bracket with that five-bolt knuckle. Larger bore and only five studs holding it in place.
Is the Ford F150 spindle the same as the F250? If you have the spindles, how about finding a number on the side of the flange?
Either way, will the Ford spindle be the proper length and work with the same bearings and caliper spacing as the Chevy disc brake components?
Sure, it's a Ford hub and rotor, so it might just work. But seems there are enough dimension questions to do a lot more checking and double-checking to be sure.
We can check wheel bearings and seals from the books, but fewer people have the spindle numbers and specs. And I don't remember anyone re-drilling a GM caliper bracket to work with a Ford 5-bolt disc brake knuckle.
Good luck.
Paul