Hello everyone, I'm having this rear end noise coming from what seems like both rear sides of my Stang. It sounds like a grinding/loose metal on metal noise. I took it to my local mechanic, changed the shocks and sway bar links but sound is still there. The noise only shows up if I'm driving on a bumpy road or if my car is going up or down a drive way/road. The mechanic suggested to take it to the dealer, which I will be doing this week, does anybody have an idea of where the sound is coming...

2012 Ford Mustang GT rear side grinding noise (with video)