Maybe.. I would think you would need the following off the top of my head. might be other stuff...
Rear trac-bar bracket or new adj track bar, either a drop pitman or a new front track bar as well. As everything will be out of wack with the 4" a bit more than the two.
Extend front and rear sway bar links might be a good idea too.
brake lines should be fine with 4".
Not sure on adj control arms, wait and see how it turns out. i would think just lowers if you needed them.
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ