I'm not trying to be a smart-a$$, but are you sure it's a metal grinding noise. I just put in new upper control arms and now my tire is rubbing the body mount at the back of the front fender. Only happens when I'm going into a tight turn. I knew what it was because I was expecting it due to the increased caster angle from the new UCA.
Maybe you're just hearing the tire tread chewing on the body mount?