For the last 2-3 months i have been getting a vibration in the rear end especially at lower speeds. for the last week it has progressively worsened and now the rear end sounds kinda "rattley" when i go over bumps and the "wawawa" noise has gotten a little worse at slower speeds, say under 10 mph.

I just got an oil change and I had the tech look at the rear end of the car while it was up on the lift and he said everything looked great and was nice and snug except for my left rear caliper (brake caliper I am assuming) has lost its bushings and is most likely what is causing what I am hearing.

i know absolutely nothing about cars, but this seems like something too little to be causing what I am experiencing.

i havent taken it to the dealer yet, i hate the dealer around here.

any clue anyone??