Found my dash panel\A pillar squeek which has been driving me nuts over the years. Turns out it was the black plastic cowl cover. Had it off to clean the crap out from underneath it,and the noise is now gone. I used thin butyl tape underneath it to insulate and secure it better. Looks as if it was moving around quite a bit as the paint is worn down to shiny metal in several places. Always thought the noise was coming from inside the cab,but i guess not. Might be something to check on your rig,as a lot of people have this complaint. You can actually lift up the corners a bit and see under it,it will be pretty obvious where it is rubbing.