Yes you should be at 4". At 4" you would need extended sway bar links, A-Arm spacer. You would probably also need adjustable front track bar and it would be a good idea to get adjustable control arms. You might also need a xfer case drop if you have vibration problems. Also new extended shocks.
Previous Jeeps: 84 CJ7 (A True Jeep), 2000 XJ (163,000 Miles/Totaled (Pictures of wrecked Jeep in gallery)), 2004 WJ (parting out die to major electrical issues)
If you don't have time to do it right the first time, how do you have time to do it over.
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2011 Tango/Mango JKU