I have a thump (doesn't sound like metal to metal) sound coming from my front driver's side when I go over bumps/potholes at certain angles. It doesn't make the thump at all angles or when hitting all holes. No sound coming from passenger side. I noticed it more once I replaced the front bumper w a ironman bumper. I attempted to see if it's the bumper it don't move I jumper up on it, I weigh 200 lbs. What am I looking for possible bushings? What evidence would I see if it's a worn bushing?