Wow...I have a standard bed (two piece drive shaft) and have had nothing but issues with the vibration. So far they have replaced Wheels, tires, driveshaft, changed pinion angle, and changed spacer on driveshaft...been in the dealership now for over 5 weeks. I paid 50K for a piece of SHIT truck and now GM wants to trade me out for something else. I was told the issues were in the Standard Bed (two piece drive shaft) so now I hear that its a short box it makes me skeptikal. Not sure what to do....