buzzing noise

[Dusty]

next week I head to st george utah where My 2 brothers and my dad have our yearly "raber rock crawl challenge". I have my cruiser almost built to challenge a couple of modified tjs and a 4runner w solid axles on 36's. My truck is a contender this year

the problem is I have had this noise for the past year that is driving me bonkers and even more so as I have a long drive next week

the noise is a loud fluctuating buzz-like a big insect-that sounds to be comming from the dash and comes on at 45 mph. I suspect it is something vibrating from the wind at speed. I have tried removing a the wipers and trying different ac settings (cold vs hot vs ac vs off etc) but the buzz continues. I took off the shroud in front of windshield but could see nothing wrong.

has anyone had a similar problem? any ideas?

 

[KliersLC]

Do you have anything touching the transfer case shifter or the boot around it?

That thing likes to buzz if there is the slightest piece of anything touching it.

If your hood is fitted correctly you should have anything blowing around outside the cab....

 

[Dusty]

thanks for reply

not the boot at shifter. I get that noise when somrthing plastic is down there. it sounds like its comming from dash or just in front of it

 

[KliersLC]

Not related to fan speed??

Only at 45 MPH???

Or faster also??

 

[Dusty]

it starts at 45mph and stays constant therafter regardless of speed. when I slow down under 45mph the buzz goes completely away. And it dosesn't start buzzing slowly-at 45mph the buzz comes on loud and then goes away when I slow just as abruptly. nothing to do with fan speed and is there if fan is off or on

 

[CJF]

Wow, that would drive me nuts! I'd probably end up ramming someone on the freeway...

How about having someone else drive it on a safe, uncrowded road while you crawl around in the cabin looking/listening?

Curtis

 

[KliersLC]

could it be a driveline vibe??

 

[Dusty]

i am going crazy and next week i drive all the way to utah from fresno.

 

[alaskacruiser]

Try having someone press on various places on top of the dash and A-pillar while driving to see if this helps isolate the noise. Also note that items in the cupholders will create buzzing, as well as anything left in the passenger seat.

 

[Dusty]

i have tried the dash push idea. it isn't anything in the cup holders or down below. this is no subtle buzz-it is a loud buzz

 

[91Cruizer]

Check the transfer case shifter. Mine makes a buzzing at hwy speeds.