Hey all- Been chasing this annoying vibration in my 05 quad cab long bed, The truck will start to vibrate around 48mph up to 65mph (roughly). Mostly felt in the seats, but a small amount in the steering wheel as well. Feels like its coming from the rear. Changed the rear diff fluid, everything looked to be in fine shape. U joints have been changed as well, although I noticed while the driveshaft was out, the rubber support in the carrier bearing was detached about 3/4 of the way around the bearing. Is it possible the carrier bearing could be causing this vibration? Tires are pretty worn/cupped as well.