2006 cherokee auto when u get past 90 mph it will hum untill you go back below 90. anyone had this same problem?

90mph? where do you live to drive that. If you was to take that to a dealer, they would say, dont drive over the speed limit, and send you on your way, they wouldnt even get in the jeep. That could be anything at that speed, tranny, tires, road noise, rear gear. These are jeeps, not race cars.