My rear U joint went out at 50K on 2005 ram 3500 4wd. No off road, average use, mostly hwy unloaded. No angle issues. , Occasionally carry Lance Camper or pull light two horse slant trailer. Noticed slight vibration (whirring noise) at 50mph outside Barstow leaving a Flying J that disappeared at 65. Got progressively worse in San Diego. Dealership replaced the U Joint in the rear but not front. I am back in Wyoming and notice I still have a subtle vibration. It could be in the front of the rear drive shaft or ???