I have not had this problem with ford truck tansmisions, but in my aunts ford countour (it had a 4cylinder) I tried to split the nut (that ussually works), but I severly damaged the stud, and I was able to just press out the stud with a clamp, and then press in a new one. Just becouse they are studs, does not mean that they are "one with the torque converter" (LOL). I would look at what a junkyard or parts store has visible, and see if they are removable.
Good luck