Because in a year you will be replacing sagging rear leafs again. Full leaf packs are the way to go. Check CL and the classifieds here on the forum. You can piece together a full lift for a great price. I found my rear leafs on CL for $100 full packs 4.5. The guy ran them for less than 3 months before he upgraded to 6.5. I needed them to replace the sagging aal the PO installed barely a year before.
Going with a 4.5 you will need to extend your rear break lines, you can use one from a 92 or later YJ (advanced auto for less than 20). You may also need to look into an SYE kit and new ds (can use one from the front of an XJ)
Just a little FYI, I've had my AAL for over 3 years (3" AAL) and have lost .25" TOPS. Don't knock AALs unless your leafs suck to begin with. Mine were in awesome condition, probably why they've lasted so long.
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4.5" x series is still short arms. short arms are control arms that still mount to the stock locations. once you go above 4.5" of lift, i'd say you need long arms. i wouldn't hesitate to get a 4.5" lift with short though.
aftqer 4.5" of lift, your control arms look nearly vertical, with no room to swing down for flex. long arms are control arms that mount to a cross member that is mounted farther underneath (usually where the tcase crossmember goes) so they have more room to travel.
lockers don't work unless you have Rubicon stickers
Definitely go with the X-series! With the basic kit, you only get lower control arms and they are fixed so the only adjustment u have is the shims. And that's just the tip of the iceberg. If I would have known at the time, when I bought my 4.5x kit I would have gotten a track bar with a drop mount. Now I will get the iro double shear track bar and bracket. (when I shave the money)
My build thread: http://www.jeepforum.com/forum/f22/operation-cherokee-freedom-1336269/