Called the vender who could check the blue prints and give me the actual spec. Of the pitman arm and the new arm was inspect. I had to crank the pinch bolt a bit tighter and the pitman arm is now nice and tight to the shaft.
So, did the vender say it was forged? If so that would give peace of mind that really torqueing the bolt won't hurt the arm or set it up for a future stress crack.
John