[i3o2Matt]

its most likely the brakes, but you could be right BP2K2...when i had my grand prix, i had the same problem...when i was driving i could hear a lil screeching noise and sometimes when i backed up it was really, really loud, deffinately metal rubbing against metal somewhere...i took the wheel off n looked at the pads...they were like completely gone. when i got my max, it had a torn cv boot, but it had apparently been that way for almost a year, so i just needed a new axle...i couldn't hear any grinding noise or metal rubbing against metal because of it...