Realize with any leveling kit over 1.3" your upper control arms will contact your spring / Coil buckets at full droop. The only way around this is to install aftermarket control arms for around $600. I wish I knew this before I ordered mine.
Some people say that this isn't a problem "unless you jump your truck" this is not true. The first day I installed mine I hit a dip in the highway at 50mph and they hit and left gouges in the coil spring bucket. Then other people say you just need to grind a little metal off the spring bucket. I also tried this even though it killed me grinding metal off of a non replaceable part on a brand new truck. I found that unless I ground around a 1/2" off the spring bucket the upper control arms would still it.
Mac