i just purchased a 2002 disco from a used car dealer.its a one owner car clean, with no accidents. the tire appeared to have been switched around the rear tire were badly cupped and looked like the were originally on the front of the truck.at around 52-55 miles per hour i would notice a low frequency drone or vibration almost as if there were an off road tire on the right front of the rover.I put new nitto 420s tires on this saturday and notice the same problem . however if i steer to the left about 1/2 an inch the sound seems to go away any one have any ideas truck is stock no lift.there are no vibes or shimmy in the wheel . im going to get the truck aligned anyway because the way the old tires were cupped.any other ideas thanks wayne