It was totally unsafe but I clamped vice grips on the stud with the cotter through the hole and drove down the road to harbor freight. I doubt that the vice grips would have held up in the case that the pitman arm broke free while driving, but luckily its seized so tightly that I made it safely. I bought a 45 pc tap and die set, but the die stock was too long and hit the pitman arm when I tried to turn it. So I decided to try spinning the (circular) die with vice grips but the die snapped in half. At this point I realized I needed a hex die, but unfortunately I couldn't find anywhere that had a m14x1.5 hex die so I had to order one with next day shipping. Since it's the weekend it won't be sent until Monday. I was able to tap the castle nut (which was also damaged) so it will match the m14x1.5 threads on the stud.
The stud is locked in place on the drag link so it shouldn't spin when I re thread it. Although I planned on re threading it with the pitman arm still on, since I only need to repair the threads to the point where the castle nut snugs tight on the pitman.
The lesson I learned out of all this is if you beat the crap out of the pitman arm to remove it, at least leave the nut on the top of the stud to prevent mushrooming the threads.
