have the same problem on my 2000 bought new tires and aligment and still has a little of a hum sound like a truck with big tires right? Im going to turn the roters and try that and if that don't fix it i figure that it is just the type of tire that is made for the suv's i'm willing to bet that if we put street tires on them that it will go away but you probley will get stuck ? Have fun I am.