Turned out to be the aftermarket off road light bar.
Roof led light bar wind noise.
Wind noise can come from light bars when they are mounted in such a way that wind can blow across the cooling fins on the back of the bar causing noisy vibrations.
Guaranteed to stop the wind noise from your led light bar the first time.
This led light bar wind noise isolator kit helps cut this annoyance out.
I had a loud whistle or frequency sound on a gmc duramax truck.
Led light bars can more often than not make a good bit of resonating noise as air passes over them when out on a drive.
I bought door edge molding but it is als.
Zroadz wind diffusers are a must have for any roof mounted led light bar.
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Thank you aerox industries.
The zroadz patented noise cancelling wind diffusers provide an easy method to silence noisy roof mounted led light bars.
This is most common on jeep wranglers as the shape of their windscreen makes this a common problem.
Attach silencer while mounted no need to remove light bar.
No permanent modifications some competitor s products use screws to attach to the light bar this ruins the.
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How to stop the light bar noise for once and for all.