Ok so I had work done to my rear end back in Nov. and since then, there's been a squeak coming from the rear driver side. It's not always there but when it is, it's really loud. The squeaking also peaks when i hit little bumps in the road. So if my rear is squeaking while just driving, you can hear it peak everytime i hit a small bump if I'm on a bumpy road. Any idea what it could be?