Mabye you should do some research before you accuse someone...Don't post unless you know.
Ford knuckles, this shows a 1/2 ton knuckle verse a 3/4 ton knuckle. The red arrow shows the notch in the 1/2 ton which clears the caliper. The 3/4 ton does not have this, thus you can not swap Ford 3/4 ton knuckles on a 1/2 ton axle. If you run the 3/4 ton knuckles you must run the 3/4 ton brakes, rotor and hub. (Unless you do some custom work, NOT RECOMMENDED!) the knuckle area on the 3/4 knuckle is not meant to be ground down to that thiness. Now if you want to risk something like that, thats fine but I wouldnt go telling people that they 'fit' with a little 'grinding'. Note Ford Supercab knuckle is the same as the F150 but with a flat area on top. That would be your best option for a swap. Or like you stated, the FSJ/Chevy option is another good choice
Cheers