My 05 Gx470 when travle under 50 MPH is quiet, But in between 55--70MPH, not too loud
"woo ..woo "noise come from front. After did some research (most of good one are from this club), I believe one of front bearing is bad. My question is How do I know which side? I was
try to jack up one side, I can not spin the wheel.

Thanks

 

jack up each side and wiggle the wheel and see which side woobles more.

 

Which side wobbles when loaded? If on a right hand bend and it doesn't wobble then the right side is bad. Vice versa for left....

In my case, right went bad first. Left lasted almost 15k more. YMMV but good luck

 

Also, touch your wheels near the center...it should be noticably hotter

 

You can take off the wheel and spin them by hand and listen to each one. Not a tough job. I had the local shop press out the bearings after I pulled the whole thing apart. It is quite an expensive job if you take it into the stealer. If you replace one, you may as well replace both. The second one always goes twice as fast.

 

If it went twice as fast then it would've gone first

 

I recall there is a TSB to the Drone noise when GX achieves at the speed. Will try looking around and see if that is similar to the one you are experiencing and post it.