Yes, you will need to address something with the shocks. You can us extensions or relocation brackets. The best option would be to replace them. The popular option is the Bilstein 5100's that was mentioned. We have heard some say that they ride a little stiff though. We really like the ride you get from the RK RRD's but you dont get quite as much travel out of them.
Another thing to also keep in mind with this lift is you will need to look at making or purchasing break line relocation brackets. Or, you could upgrade to a longer break line. And speaking of upgrading, a nice up gread especailly on the 2dr JK's is the front lower control arms!
Overall though, this is a great kit and you can build it and upgrade it into just about anything you imagine from RK! Let us know if you have any quesitons or if there is anything we can do to help!