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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.
I assume it occurs while your truck is in motion. My '04 does it "sometimes". In my case, it's the rear brake rotors and pads. Nothing to worry about. Not saying that's what is going on with your truck, but that's what happens on mine.