Has Anyone Successfully Installed Gm Nav Unit In Silverado

I HAVE AN 04 SILVERADO SS THAT CAME STOCK WITH THE SIX DISK INDASH DOSE UNIT WITH THE AMP AND SUB JUNK.....ANYWAY DECIDED TO ADD THE NAV UNIT THAT COMES IN DENALIS AND CADDI....INSTALLED UMIT TODAY. ALL NAV FETURES WORK GREAT VOICE PROMTS AND STUFF ....BUT THERE IS NO OTHER AUDIO ...CD,XM,FM IF ANYONE HAS SUCCESSFULLY COMPLETED THIS INSTALL PLEASE REPLY ....I WOULD EVEN BE WILLING TO PAY FOR THIS INFO

THANKS,
DAVE

check on www.jpcustoms.com he may have some type of harness adapter you may need he has alot of interfaces for things like that with the factory radios and onstar stuff all that junk. good luck.

-KRAZYMATT