I have a very unique problem possibly air flow on my 2006 Ford E350 Super Duty with a Rockport 12 box. I get a fluttering noise that is so annoying. I had the front end done tires even the engine is of while moving you still the noise. Sounds exactly like someone if you car opens up a window but not the other side and you get the pressure sound your ears are screaming for you to open up the other window to balance the pressure. That is the sound but opening my windows on my truck does nothing. Can you help? The sound can be heard from 7MPH and up. 19,000 miles great condition. Would mud flaps help?
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