I'M NOT QUALIFIED TO ANSWER YOUR QUESTION
HOWEVER,
"CARADIODOC" IS THE MAN AN THIS SITE FOR RADIO STUFF!
HERE'S JUST ONE ANSWER THAT MIGHT SORTA HELP YOU UNDERSTAND THE SEVERITY OF "MAYBE WHAT HAS BEEN DONE!
PLEASE READ THESE ANSWERS HE GAVE IN THIS LINK
https://www.2carpros.com/questions/2004-pontiac-gto-had-stereo-installed-soon-left-place-felt-big-difference-loss
IF YOU WILL GO TO THE TOP OF THIS PAGE AND GO TO "SEARCH" ON THE BIG BLUE BAR. INSTALL THESE WORDS "CARADIODOC GM RADIO DEALERSHIP COMPUTER" OR ANY OTHER COMBINATION WITH "CARADIODOC"s NAME IN IT, YOU WILL FIND MANY OTHER POSTS HE HAS ANSWERED ON THE GM RADIO SUBJECT.
MANY TIMES "DOC" WILL SEE A RADIO QUESTION AND JUMP ON IN!
IF YOU NEED ME TO, I CAN SEND HIM A 2CAR MESSAGE AND MAYBE HOOK HIM UP WITH YOU IF THIS OTHER STUFF AIN'T HELPIN"
HOPEFULLY "ME AND WILLY" HAVE STEERED YOU IN A GOOD DIRECTION
THE MEDIC
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Monday, September 7th, 2015 AT 5:58 PM