Whistle sound

Hey all. Just wanted to get some opinions from you all. Got a whisling sound coming from the rear end at highway speeds. Didn’t notice it until after my 5k maintenance. All they did was rotate tires. Any opinions are appreciated.

 

Turn. On re circ on your ac. Might be rear diff . Howl more noticeable when it’s open.

 

That helped

 

The only thing odd that I have found is I’ve got a nail in a rear tire.

 

The frame vibrates at certain speeds and inclines. If the noise only last a few seconds then it’s probably just the harmonic noise and you can’t do much about it. If the sound is constant then it may be the rear diff.