Audio Systems: 2005 Impala dash vibration after radio install, vibration noise, metal brackets

Question
I had an aftermarket Panasonic installed into my 2005 Impala.  After the radio install, I have noticed a vibration noise that is getting worse. The noise is most noticable when stereo is off and driving on a rough road. I would like to remove the dash myself (I am mechanically capable) but have never removed a dash, except when building a street racer.  Can you direct me to some instructions before I grab a crowbar and start prying?  Thanks

Answer
sorry i have not work on that car before i know the complet dash comes out in one piece  you need to get a rear radio bracket and screw that in to the back of the radio  the original radio mount with 4 screws 2 metal brackets and a rear screw the new radio is mount in to a plastic  kit and the back of the radio is in the air
good luck