I get this popping sound under my truck directly under the passengers side floorboard when my truck get hot. I went on a trip and after driving over 100 miles or so I heard a pop that sounded almost like metal flexing under the passengers floorboard. My wife sad that she could feel a vibration in the floorboard also. I pulled over and took my flashlight and looked in the wheelwell and everything looked fine. The truck doesn't do this on my everyday commute. It only seems to happen when I drive it for a while. I would appreciate if anyone could explain what this noise might be. Thank You!
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