My 2010 Power Wagon finally started to get a bad vibration, only has 42000 miles. Dealer found rear driveshaft U-joint bad, still had vibration, found front axle u-joint bad, still had vibration. They put different wheels and tires on, change to another drive shaft. Still had vibration. They finally listened after I told them, it was a u-joint bad or one of the axles has a bad bearing or ring and pinion going bad. Now the rear axle is going to be rebuilt, so far the bearings are bad. Some dealers will not listen. Sure am glad it still under warranty.