Virtually none. There have been numerous threads about this and people have actually tried it and the resulting lift is virtually none. The spring rate is different and I think the JK's are available with something like 27 different springs and combinations thereof but the height differences are not enough to be measurable. Save your money and buy a real lift. A simple budget boost will give you more height for less money that buying four door rubicon springs and shocks.
2014 Copperhead Pearl Unlimited Sahara in progress