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How to fix loud humming noise?

Recently my 2000 ford focus lx has started making a loud humming noise from the back of the car.I had the bearings checked not that long ago and they seem fine.
Once the car hits about 30mph it starts,and gets louder the faster i go?
neal, October 2010
wheel bearings are deceptive and would get the front checked also

cdc, October 2010
link Click here to see other fixes for Ford Focus LX.