yesterday, when I was at work (delivering pizza), I began to hear a thud/knocking noise coming from the rear of the car. it seems to be coming from the driver's side, and it makes this noise when any time i go over a relatively large bump or dip in the road. it also makes noise when making a LEFT turn, but not when i make a RIGHT turn. any ideas? i think these shitty East Toledo roads are beginning to take a toll on old lum ops: .