1997 Taurus front end noise

I have a 1997 Taurus and a howling noise is comming from the front end. The noise starts at about 30mph and gets loudest at about 45mph
and up. A vibration is also felt along with the noise. The noise is the same when accelerating, decelerating and braking and doesn't change when turning. The auto trans fluid level is ok and fluid color looks good. The noise doesen't seem to be comming from one side of the car or the other. Any ideas?
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