Thought I had a blow out!

[Denny B]

I had the craziest thing happen today. 2021 1500 Limited, crew cab. I’ve had this truck for 6 months and never drive with the windows open (I live in Florida A/C is always on). I was driving down a country road doing 55 MPH and for some reason decided to open the rear door windows. As I was opening the passenger side rear window I started experiencing a pretty violent shake in the whole truck. I immediately thought I just had a tire go flat. I pulled off to the side of the road to check which tire was flat and to my surprise all 4 tires were just fine.

I got back in the truck and started down the road. As I reached about 40 MPH the truck started shaking again. The faster I went the more pronounced the shake became. Then I realized the rear seat and headrests were shaking pretty hard too. I CLOSED THE WINDOW AND THE SKAKE STOPPED! CRAZY!

Every time I would open either rear door window the rear seat would begin to shake enough that I could feel it throughout the whole truck. If I opened the front windows while the rear windows were open the shake would go away.

Try it. Crew Cab…rear door windows open…55 MPH.

 

[CanRebel]

strange. I often have back windows open, sometimes the rear window.
I'm often driving faster than though. 140-160km. no issues.
I have Rebel 2021. I have hellwig (middle) and changed wheels/tires.
Related or not, unknown, just making comment it's not stock anymore.

 

[PolarisCobra]

Open another window, it will stop. Has to do with aerodynamics. On many cars, if you open the sunroof beyond a certain point, the same thing will happen. Crack a window, it stops. It is a pressure buildup that happens.

 

[Sandevino]

The infamous Helmholtz Resonance.

 

[Rado]

As mentioned Normal. Sound's like a helicopter
Open 2 windows part way and the noise stops.
Happens to my car as well !
Neither vibrate like yours but loud as heck

 

[Moose2]

When I do that all I hear is a whistle, through my ears!

 

[Firebird]

Back windows only will buffet like crazy, always have to open the rear slider if I drop those windows

 

[soapy]

There is a vent behind the rear seats that is probably not big enough to equalize the air pressure coming into the cab. I just open the sliding rear window a little and no more problem.