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I've had a noticeable roar under the front end of the truck when driven.  The noise is not there when setting still.  I recently replaced the original all terrain, BF Goodrich, tires that were worn, cupped, etc.  I felt that the worn tires were the issue with the noise.  The replacement tires are Uniroyal street tires.  I still have the noise.  I listened to the fan clutch and felt that it might not be working properly.  I changed the fan clutch and the noise remains.  I was told when the new tires were installed that the hub kits were/may be the problem.  I lifted the truck and have not play in the wheel nor noise in the rotation of the wheel.  The truck only has 70 k miles on it.  Any recommendation/answer?