I can't tell, it feels like the whole truck. The vibration has gotten worse, I can see it in my mirrors. I also noticed this weekend that when I have my 4wheeler in the back of my truck and I hit a dip in the road I get a little rub sound, it is not my truck bottoming out it almost sounds like my carrier bearing. I have gotten under my truck and with a little effort I can crush the rubber surrounding the bearing. Hoping someone has a clue.
Shane