I found the solution to my major rattle online somewhere. I had a major rattle fromo behind the radio...a metal type rattle. I inserted a piece of 1/4" hard rubber hose sideways into the gap between the center console and the bottom of the radio/AC control panel. Put it another way...if you look at the most forward part of the center console...you'll see it goes under the bottom of the radio/AC panel. I just sqeezed the hose in that gap on both the right and left side...problem fixed.
Just thought I'd mention it...something to try.