Have a 2004 1/2 3500 quad cab. I have noticed a rattle that sounds like it's coming from the dash/cup holder/ash tray????? Finally narrowed it down to the 4wd shifter. If I apply a little pressure to it, or actually stop and shift it to neutral, then back to 2wd, the rattle goes away for a short time. Anyone else experiencing this problem. Haven't taken it to the shop to complain about this yet!