If its under the hood, look for the black steel tubing that runs along the top of the firewall. This is held in by plastic clips and on my rig, the tubing had popped out from the clips in certain spots and vibrated at high speed/RPM. Someone else reported this on this site so I checked out my rig and hand the same problem.
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Black, Lux, Off-road Package, chrome brush, black step bar, mud flaps
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