Trying to Diagnose A Noise

[CapeX5]

My 2001 4.4 has had an unusual "whirring" noise for a few months now. At first I thought it was a tire going bad. Than I thought wheel bearing. I have had it jacked up, pushed and pulled on numerous parts of suspension. Wheels on, wheels off, no clunks or discernible unusual noises. It sounds like the rear, but could be front. Considered the front diff. Changed the oil, everything seems fine. Now, turning wheel suddenly to the right while driving lessens the noise for a moment. So, it's driving me nuts and slowly getting worse. Anyone have any suggestions on how to diagnose a bad wheel bearing? My next step is to jack it up, all 4 wheels off the ground and run it to listen more closely. Want to fix this before it goes on me while driving. Any help would be appreciated.