Well Ed, mine's an '05 Unlimited version, but I suspect other than the wheelbase, they're the same. 31X10.5 Goodyear MT tires, 4.10 gears, 4:1 transfer case, Dana 44 axles, both with air lockers, rocker panels, and cool Rubicon graphics
Also I think the springs are a little heavier than other models and the u-joints are made of solid steel, not drilled out for grease fittings like normal vehicles. Also, all breather tubes (for auto transmission and diffs) have tubes that extend up to the level of the radiator so there's less chance of sucking in mud and water. I'm not sure if that's just a Rubicon thing or not, but I thought I read somewhere that it was.
In my opinion, it's the air lockers and that 4:1 transfer case that really make the difference. Oh yeah, and you don't need a SYE kit (or a transfer case drop kit) if your gonna lift her. Mine has a RE 3.5" suspension lift and I have no driveline vibrations at all.