Here's an update...
Early this morning (5:00 AM) I started off to work with the High pitched squeel as I drove up the street. Lately, I have been trying to get the Air pressure the same in all tires, and the right rear was showing 2 pounds over the others. I pulled over and in those early morning hours, when all is still and quiet, and with the motor off, I bent down to pop the stem cap. With my ear just in front of the rear wheel, I could hear some lower frequency sound coming from just in front of the rear wheel but near the bottom of the Jeep.
I'm wondering if it is related to my other problem, but don't have any idea as to what is located just in front of that wheel.