Thanks katuah... was planning on just taking it to a local mechanic if all else fails, but ECGS would certainly be better set up to look into this. I definitely wasn't expecting these sorts of driveline vibe issues after the lift... guess it would have been too easy if everything had gone smoothly (no pun intended). I also think the lift ended up being taller than advertised, probably closer to 3".
Did notice today that there's much less (if any) noise with a full tank of gas and 240 lbs of concrete bags in the trunk. Guess that points to a shaft angle that is too steep.
See you around Durham... PS, any good spots to do a little light wheeling around here, besides Uwharrie?