The Rubicon I drove back in January featured beefier Dana 44 axles front and rear with electronic lockers (the Sahara sports a Dana 30 up front, which is 14 fewer Danas), an upgraded transfer case, a 4:1 low range crawl gear (as opposed to 2.72:1 in the Sahara), a front swaybar disconnect and knobby 32 - inch tires. (speedsportlife.com)
I would add that most cars are biased for understeer from the factory, and that adding a stiffer rear swaybar can give a huge handling boost by dialing out some of this understeer bias. (mechanics.stackexchange.com)
In its most extreme trims, the Grand Cherokee can be outfitted with skid plates to make runs to the ski lodge up an unplowed private dirt road with its front swaybar disconnected. (bestride.com)