'09 F250 Vibration - Need Help

[jramsey0008]

I have an '09 F250CC KR Long Bed that has developed a terrible vibration that sounds like a kazoo. It only happens on the interstate at ~70+MPH and has to have a strong cross wind. If I travel 70MPH on a calm day, no noise. It is coming from the drivers side, near the base of the windshield. If I turn the wipers on, it stops when the wipers are at top. If I even crack the drivers side window it stops. It is definitely related to airflow over / around the cab. I've zip tied and secured things in the fender well, under the hood, etc... and it seems to be getting progressively worse. And by worse its more frequent, and lasts longer, pitch and noise level are constant. I'm starting to think it may be inside the fresh air intake between hood and windshield, and when I crack the window the pressure in the cab equalizes and air isn't flowing in there. If I turn the blower on full it doesn't affect it. Has anyone heard of such a thing or have a hair-brained clue as to what this might be? I thought it may be related to cabin air filter (I live on gravel road so could explain why it is getting worse, but I now know there isnt' a cabin filter on my truck) I have an 800mi round trip to KY Lake next weekend and would rather not have to drive with window down the whole time.

Thanks
Jason

[f250ghost]

My 08 did the same thing...i have the rain x latitude wipers and theyre known to do that at higher speeds...i guess its the wind slipping under the blade

[jramsey0008]

No kidding???? I have Rain-X wipers on it. I'm replacing them tonight with Bosch's. Thank you for the reply, that makes a lot of sense based on symptoms and how it is getting worse. Its worth throwing a new set at it anyways.... hopefully its a fix.

Thanks again...

[f250ghost]

No problem man! Freaked me out the first time it happened to me lol