at 4" be sure to get new drive lines too. remember a good lift is measured at the rear so the front is going to be like 5+. this is a lot of lift on a Jk. Lifts atthis size should be a COMPLETE and from a GOOD company. if it cuts corners at that height you will not be happy how it handles. depending on the lift ; flipped drags and raised track bars to keep the roll center flatter. so much at 3aqnd up that the cost gets people. plan on about 1k per inch at that height. all in.