Have this noise coming from the rear of my car..In the last 1.5 year or so I have changed the Springs(SVT) changed the struts(Mcpherson fron napa.. and I just recently changed the sway bar links and bushings.. the sound happens more with little gas and subsides a bit with a full tank, it sounds like metal on metal. It can happen on big bumps or even the little ones.. Driving me crazy cuz I cannot pin point it.. Any suggestions,, Could it be a broken spring?