72charger, i had the SAME thing happen to me. only happens when i'm rolling through a parking lot or turning the wheel or whatever. i actually just had my car in the shop for something else, and the guy said he thinks its something in the driveshaft. dunno, i might replace it and i'll let ya know if it works

 

Update: i called the dealer and told them that i want to pick it up on saturday today being monday... i told him my concern about the sound and it being a possiblility of the rear end and he said he will bring it into the shop have some one drive it and see the diagnosis... im going to also ask them to document it just incase the car does crap out on me down the road jesus this is scarry already havnt got the car and have to worry about something but dont wanna pass up a otherwise clean beautiful camaro... o well ill keep you guys updated...