So I had myself some fun wheeling today and before I left my spot my steering started acting up. I can make slight steering movements like changing lanes with no issues, but when attempting to make sharp turns the steering fights me and I get a vibration you can feel from the passenger side floor board along with a whine. My power steering pump pulley has had a wobble when viewed from the side since I bought the truck, so my first thought is to look at replacing the pump. Any other ideas from you fine forum folks? 
Could be a bearing hub locking up, and locking hub still locked or broken, ball joint half? failed lol, steering box or that pump you mentioned. Dunno
