Dude your dealers dumb, anyway he must have bumped his head on a tree limb or there is something I don't know. I just took the nav out of my 04 and put in the 6 disc. Everything plugged in the same, BUT the nav uses an extra anttena for the gps , just another anttena pluggin on the back, and of course the regular anttena. But really think about it the nav system in the trucks isn't quit as great as some aftermarkets or in the dodge cars. I'm not saying its not good, just the screen isn't as large as it could be. If I can help anymore let me know thanks.