I'm not sure you can get 2 inches by turning up the torsion keys but if you can the suspension will suffer. I suggest replacing the keys to get the 2 inches. You should also replace the shock with a longer one or add 1.5 to 2 inches to the lower mount bracket on the shock. I had a local off road shop do my 04 Z71 and they replaced the keys, upper control arms, and modified the shock bottom mount bracket. They also changed the idler arm with a beefed up one and put half inch spacers where the sway bar attached to the frame. Plus an add a leaf to the rear. That cost me $2500.
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