Sounds like a prop plane going down the road always worried that it may besomething serious. My tires are also cupped from an previous problem with bad shocks. is it the tires making that sound?
Cupped tires can make noise rotate them to the front to see if the problem goes with the tires they do have wheel bearings that go bad and the rear diff but the rear diff will change noise when your on and off the gas
SOURCE: Whinning noise
first checkout the drive belt and the powersteering fluid and this make help with your problem that you are having
SOURCE: '03 Merc Mountaineer humming noise when turning
If same tires as before & air pressure set correctly, or as usual, a humming when swerving, or turning one way or the other or both, it's usually a pretty good indicator.
SOURCE: 2002 Mountaineer SUV, 4WD, Especially while turning the wheels
I had the same problem with my 2002 Mountaineer at about forty thousand miles. Murcury replaced the steering column free under warranty. I now have ninty two thousand miles and it's back. The rear end is making a whining noise, the tranny is starting to slip, and the rear window regulator went out. Why did we buy a Mercury?????? Disgusted Dave!!!
SOURCE: lOAD HUMMING NOISE DRIVER SIDE
sounds like you wheel bearings need to be greased up. Good ideal to have full grease job anyways. U-joints, tie rods, and bearing especially
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look more at the rear wheel bearings if the noise is constant if not all wheel drive jack up the rear end and have someone run the truck up ti the speed the noise starts and hold a long screw drive to the different housings hold the other end to your ear see what are is the loadest
when driving down the road tires make a roaring sound
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