Rear end vibration

[chuzie]

3.5" suspension is the upper limit for a stock shaft. I suspect you may either have a bad u-joint in the cv or the cv head may be toast. Try pressing the shaft vertically from the bottom on the transfer case side. Do you get movement? If so, it is likely a worn cv bearing. I don't think that would cause your wobble though. A wobble in the shaft is most likely from failed bearings in a u-joint cap causing a shift in the center line of the shaft.