I have a 99 GTP making a humming bearing noise while driving above maybe 20 mph. It is louder if I'm holding a speed whith light gas and when I let off the gas It sounds just like a bearing. I just did the driver side bearing a few months ago and this car had the cv axles done like a year ago. I've done bearings before and know to turn the wheel while driving to hear when it goes away or gets worse to determine the bearing bad but this Is wierd because when I'm on the highway it sounds like the right side bearing and if in doing like 40 or so off the highway it sounds like the driver side i just did. I'e read it could be like a differncial bearing or somthing?? Not sure on this one need some help.