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3rd Gen Ram Tech2002-2008 Rams: This section is for TECHNICAL discussions only, that involve the 2002 through 2008 Rams Rams. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
My 06 does the same thing, usually after taking off and with the wheels turned a little bit. Kinda sounds like the tires threw a rock out but it makes the sound a lot so I know it can't be rocks.
If it is while the truck is not running and cooling down, it's probably just metal contracting, like pipes in an old house. All vehicles do this to some extent.