Sounds like you are dealing with two different issues. One is a worn out CV joint on the front drive line and the other is death wobble, a common issue after a lift. Since you are off center anyway, I would suggest getting and installing a new adjustable track bar. Get someone to saw your steering wheel back and forth while you look at all the front end components. Fix anything that moves when it is not supposed to. Also get that front end shop to check your castor angle while your at it.