Whistle at 48-49mph

At exactly 48-49mph I get a whistle noise. Seems to come from the front. Anyone else get this? I think it's always been there, but Im paying more attention to it now. Seems also to only be in 5th and 6th gear. I'm thinking some sort of resonance.....again? BTW not diff howl. I have that, and it's a completely different sound.

 

/thread

 

I was thinking that. Is this a known/common thing ?

 

yes, I believe so.

 

Control arms TSB possibly. This stopped the whistling on mine, then I lost the plugs off road and it started whistling again.

https://www.tacomaworld.com/threads/lower-control-arms-tsb-is-a-thing.435490/

 

I am not too sure whether it's the roof rack or control arms. I seem to hear it exactly at 48-49mph in 5th or 6th gear. If it were the rack or the control arms, I should hear it regardless of gear.....

 

The control arm would be heard despite the gear as well.

 

What's the pitch of the whistle?

 

I thought I had a harmonic whistle but I discovered it’s the AC at certain rpms.

 

My AC does the same thing. The noise cycles about every 20 seconds.