I have replaced both hubs which includes the bearing on my '98 4x4 blazer. I just recently had a tire rotation done on my car and everything seemed fine for a while. Now i am getting some whining noise coming from the front right side of the car, almost like a bearing noise again. however this time if i jerk the car back and forth, there is no audible change to the sound, which leads me to believe it is not the bearing. Also, the noise seems to come and go - more prevalent in the cold. again this morning after i took the tire off and put it back on the sound no longer exists. Does anyone have any ideas where this sound may be coming from? It is definitely rotational. As i go faster the sound gets much higher pitched and lower at slow speeds.