I have a vibration type noise when slowing down below 20 mph and it goes away when i shift into neutral. It almost sound like a cupped tire type of road noise. I installed brand new tires 100 miles ago. The old tires were cupped. I also hear a whining noise when I maintain a slow speed and bring engine rpm up from coast to very slight acceleration. Seems to be a front differential type of noise that you'd hear in the rear diff between the ring and pinion gears. Could this be in the transfer case? I'm into this 04 Yukon for a new hub bearing, new tires, and now more issues to nickle dime me to death. Also need new calipers and rear backing plates. What next!!!!