I have 07 cummins 6.7. I have a roaring sound in the front end that sounds like what you would hear out of mud tires but I'm running all terrains and it does it on gravel not just asphalt. Already jacked up the back end and checked the rear end but no noise. Also mechanic replaced both front wheel bearings and u joints but didn't help at all. Anybody know what's wrong??

 

Try rotating the tires. Does the tread look like any uneven tread wear at all. That will make a hell of a noise