I had a noise behind the instrument cluster. Kinda like a plastic on plastic "tick". Turns out it was the duct work for the driver side vents. There is a duct for the main vent at the door and one for the small vent above. They were so close that while driving they were tapping each other, making the noise that drove me crazy. I fixed it by stuffing a piece of cloth between them.
If there is one complaint I have about these trucks, it is that there seems to be a lot of squeaks, rattles and other noises from the interior compared to other trucks I have owned/driven. They aren't very loud, and most people don't hear them, but I do and they drive me nuts. This was my first Ram, so maybe I got a dud, or maybe that is a trade-off for a much cheaper sticker price. Having said that, I have no regrets of buying the Ram, and each brand(even each vehicle) has their own quirks, so I guess I'll deal with it for now, 390hp should help me deal just fine....