New vibration/noise. Need help

[Cow_doc.308]

This has happened on 2 occasions now and both have been in high wind (20-30mph) at interstate speed (65-75mph).

My truck will literally sound like an exhaust break on an 18 wheeler. Thats the best way I know to describe it. Its running fine and stops when I slow down a bit. The noise is definitely forward of the cab. It doesn't make the truck unstable or anything and always stops when I slow down.

Any ideas?

 

[Cow_doc.308]

No one?

 

[jgue467]

Flexing?

So you're sayin' it otherwise runs OK? Does power diminish when this sound is heard? so it sounds like a big rig using its engine brake? that is loud. all I can think of is some kind of exhaust leak that comes at a point where the engine is under stress (high speed w/high wind) and something is flexing. toyo's exhaust piping does leave a fair amount to be desired....

 

[Cow_doc.308]

Yea. No loss of power. I always back out of the throttle cause it's a little scary. Lol but yea it's running normally. Rpms stay steady and the ride doesn't become unstable. It's just loud.

 

[jgue467]

or maybe its something loose

well that is good engine output is not affected. will it do it right away again if you proceed to speed up again?

Now I would check for loose fender well parts. Could be a plastic skirt just forward of either left/right tire that is pulling back with the wind and hitting your tire, that made an awful noise on mine when it got loose. what else could do this-anyone?

 

[Cow_doc.308]

It may or may not if it again if I speed back up. It did a little yesterday then I just slowed down til I got where I was going.

But no problems doing 75 on my way to work this morning.