arca07

I have the same problem on a 3500 dually was under again tonight and there is a heat shield after the muffler and tucked up under the bed itsvery thin and attached with push in buttons this was part of the rattle then I found the rear disk shroud tapping on everything with a little rubber Mallett made the sound so took off wheels and removed the backer plate back to the road that was part of the sound also the deper rattle still have the vibration in the floor though and it's only at acceleration and up hill mostly