Here's some advice from an old guy that was a mechanic also. I installed a R.E. 7000 which is 4.5 inches and a R.E, one inch body lift. Added to that some 35 MTR's and lwered my wheels to 15 inch for the extra sidewall benefits. BTW, I own a '04 Rubicon. Went to 12.5's for balence. As you go higher, you need a wider tire. Love the performance, especially with 4:88's. Hate the maintenace! Everytime I mud, I have to inspect and grease the jeep. It seems I added about twenty new zerks to grease! Dusty trails require the same maintenace in a timely fashion. Going thro water, you have to re-grease. Plus I added Currie steering and have more to do. After adding $36K worth of mods, I have an awesome jeep.
One day, while b.s.-ing with my club, a light bulb went off! All I need to do to get roughly the same benefits, in hindsight, would have been a different choice! Rubicon Express has a bushing problem in all the control arms. They compress easily and therefore malfunction. You can still drive it home but you'll need another $60 for new bushings! Alot of my extreme
members got rid of those control arm assemblies by modifying them with a johnny joint instead of a bushing.
The easy solution to all the problems of having a lift is to install a 2 inch spring lift and a one inch body lift. Add to that a set of quick disconnects and you're almost set. I'd choose 33 inch tires with a 12.5 width and a 15 inch rim. All that together would give you alot of articulation and some height. If you go the way I did, you have to modify the steering box, the entire brake system, beef up the axles, steering knucles, change gears so you can move those tires that you added!