high-pitched squeel on highway curves
 

Need some expert advice please:

Driving down the highway.

Get a super high-pitched metal on metal squeal that sounds like a dog whistle. It is faint, not loud.

Does this whenever taking a right-bank or left-bank curves at highway speed. No noise on straight stretches. No noise on 30mph slow speed curves or turns.

Checked the brakes and pad wear sensors. Pads at 90% (since new with 60K miles on her). The H2 will wear out before the pads do.
So it is not the wear sensors. Rotors are clean and smooth too.

The noise is only there when either side is loaded up during the curves. Does not sound like CV clacking. Can not tell where it is coming from, but suspect the front end (as opposed to the rear of the vehicle).

I am guessing front bearings? Is there anything else that could make this type of noise at highway speed on curves? Rear bearings?

Re: high-pitched squeel on highway curves
 

Sounds like bearings to me. Usually you will hear them when turning and they will make a clicking noise when it's pushed in neutral.

Re: high-pitched squeel on highway curves
 

So here is the weird thing, which makes me wonder if it is a bearing or not. There is none of that tell-tale clicking sound when a pin bearing goes. Not sure what kind of bearings the H2 has.

You can only hear the squeal at highway speed, not noticeable at all at low speed. I will try to push it in neutral with engine off, to see if I hear anything. Thanks for that suggestion.

Re: high-pitched squeel on highway curves
 

Stock wheel and tire sizes? Any change if you lock the transfer case? On the gas or off make any difference?

Re: high-pitched squeel on highway curves
 

Yes, stock wheels and tires. On or off the gas makes no difference.

I have not locked the transfer case. It is in 4 high, because I think it has to be at 65+mph on dry roads?

Re: high-pitched squeel on highway curves
 

I guess I'd find a lift somewhere and start rotating stuff one part at a time. See if there is any play in the bearings once the truck weight is unloaded. Good luck.