(I just had my entire rear end done so that is ruled out) Im getting a metal on metal sound, when i accelerate it accelerates, and the same for deceleration. It sounds very thin though, not a heavy metal clunk, but almost like sheet metal grinding. But since it increases as speed increases it must be something in the drivetrain. Ive looked and prayed for little odds and ends but i havent found anything. Im praying its nothing too serious but its sounding like it. Any advice or experience before i throw it to the shop along with an arm and a leg?