I was wondering if you have any suggestions on how to isolate the a loud vibrating sound from the rear of the car as my 72 Camaro is idling. Also on low speeds I hear the same sound. Once I start picking up speed noise goes away.. I just replaced out the differential, leaf springs, and shocks. Everything appears to be tight and nothing loose. I did notice some rattling noise as I tap on my trunk lid. I was wondering if there are any rubber pieces to cushion between the top and bottom sheet metal on the trunk lid? I have the mufflers added but not the tail pipe yet. I know it is a bit loud from not having the tail pipe section yet, but nothing loose with the exhaust pipe leading up to the muffler. Thank you.