2002 Ford Focus Sounds like a wheel bearing but could it be

Hi - I have a Ford Focus ZTS and have been having noises that sound like a wheel bearing going out. I have had the wheel bearings checked, and have been told they are fine. Have all brand new tires on the car, and a new alignment. The noise is still present, and someone told me that it could be the transmission. The car shifts fine, no issues at all. Help.