Question about 2004 Ford Expedition
Most likely it is a Hub bearing worn out. If you have access to a highway with a sweeping curve the outside tire turns faster than the inside tire following the curve. So if the noise increases on a left curve, the right side is bad. If the noise increases on a right curve, the left bearing is bad.
You did not state whether you have 4 wheel drive or 2 wheel drive.
The 4 wheel drives have the Hub bearing. Check around for parts prices. The price can vary by $100 from store to store. If you have the 2 Wheel version it is much cheaper to replace and you will need a wheel bearing seal.
Do spend a little time checking the other components in a 4x4 as the additional components can also make noise.
Posted on Jul 12, 2010
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Posted on Jan 02, 2017
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