Am a little fuzzy as per memory recall as per your slight modification.., but I'd go to the arbusa.com web site, and obtain the contact telephone number. Some of the fellers there have XJ's, and are quite knowledgeable as per your question.., well.., they were the last time I talked to them several years ago, lol.
You are aware that you will probably have to do the SYE modification, and perhaps the necessary different length propeller shaft to go up 3"--4" and up right? I could only go up to the 2" lift for the RENIX, or I would have to do the SYE mod. Thats what.., $600 bucks for the kit, and extra for however you obtain a proper length shaft.., whether you cut, and weld one, or purchase one already done.., as best as I can recall. The latter approaches a grand in cost for the extra inch, and beyond for our RENIX vehicles in order to run on 31 inch tires, and above.
BTW: I went with Hankook Dynapro MT tires as they are really a good mud tire, fairly quite on the highway, but not much else, (google for the Mud Tire Shoot Out), and they are available at 30". Good Year Wrangler Kevlar types is what I really wanted, but they are not available at the smaller 30" size. With something like the JKS front sway bar disconnects, and removing the rear stabilizer, with 30" tires you will have a good all-around set-up for most simple off-roading, easier to get in, and out of, and well balanced for a generally top heavy vehicle, especially when utilizing cargo rack. RENIX Brakes suck, so take that into consideration when deciding the type of foot print each tire provides overall.
With Old Man Emu shocks, (all around), I can report outstanding performance so far on pot holed asphalt, dirt, as well as corduroy dirt, and major ruts, whether in dirt, mud, or ice. Me.., I'd rather build up with the 1999 model, (easier to find parts too), as it seems to have good reviews, and less cost to mod., imho. Well that's really a 'relative thing', 'eh? :soapbox: