Also the warranty company has to prove that the lift caused the part to fail. So most of your warranty should be good. Your CV axles and suspension parts might not be covered anymore but they can't say your motor blew up because you lifted your jeep. Thats my understanding anyway. Oh and JBA UCA means Jeepin by Al Upper control arm. Any more questions feel free to ask
Additional comments
Ok was able to check that kit out. I wouldn't do it just based on the height alone without addressing the CV angles. Like I said earlier anything over 2" not addressing the CV angle is bad. The rough country will give you a solid 2" lift ($150) and a level ride bringing the nose up. This will allow a max of 32" tires with slight modification to the pinch weld and wheel well plastic. That combination will allow you to do some serious off road action. Gives you time to save up for the SL kit. But I would invest in the armor first.