I had a creaking in my dash after about 8-10k miles, and it slowly got worse and worse to the point where just the motor vibration at real low rpms would cause it, I finally pulled the dash apart around the radio bezel, (I have bucket seats with center console ) so part of that had to come apart too, but like I said I ended up stripping all of the front bezel off around the radio, a/c controls etc. and then I turned the truck on to get it to vibrate and just had to listen real closely, it ended up being one of the screws on a bracket that held either the radio, or one of the small cross bars it was in a little bit of a bind, so I just loosend the screw and let everything relax wherever it settled and then tighened everything back up and it has been good ever since.
However, now I have a creaking/rattling somewhere in the upright piece between the driver side front and rear door. Only does it over bumps but it is begining to get annoying.