Wind flexes the roof on cab

Question

Hello, I have a 2007 Chevy 3500 Classic extended cab, 2009 AR 990. There is about an 8 inch gap between the cab-over and top of truck roof. Speeds above 50 I hear and feel the top of the cab flexing slightly from wind. Any ideas how to stop this, do you think a bug deflector may change the wind pattern to stop it.

My 2000 F350 didn't have this problem, the distance was closer though.

Thanks,

bighatnohorse · Answer

It's only a suggestion with no proven evidence, but you might consider applying a few Airtabs to either the cab roof or the underside of the cabover.AIRTABS

geoboy · Answer

If your 2007 is the old style, the roof flexing happens when the drivers window is down. If you have a extended or crew cab you can eliminate the flexing by opening the rear windows. The newer GM’s have reinforcing ribs to stop the flexing.

rtbmrgl · Answer

GeoBoy wrote:If your 2007 is the old style, the roof flexing happens when the drivers window is down. If you have a extended or crew cab you can eliminate the flexing by opening the rear windows. The newer GM’s have reinforcing ribs to stop the flexing.  Thanks, your absolutely correct, I only hear it with the drivers window down, apparently the cab slightly holds pressure and keeps the cab from flexing. I'll try the opening of the rear window next trip.Also the Airtab thing is interesting.  Maybe I can rig up a drywall ceiling support, that might do it. :R

wnjj · Answer

Our 2005 roof oil cans in gusty winds with the camper on. I roll the windows up and turn the fan up and that usually stops it.

Opening the rear window might stop the repeated oil canning but I guessing that’s because the roof stays bent down. The high pressure above the cab doesn’t go away by decreasing the in cab pressure.

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Wind flexes the roof on cab

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