I thought this article was interesting
in particular about the missing front ELSD
"Finally, the downgraded Quadra-Drive II system is different from previous versions; the locking diff up front is gone. However, amazingly enough the system is so much better in sensing wheel slip that if you actually drive the beast it can get the job done. Rockcrawling, on the other hand, is still best left to a solid-axle vehicle, such as the Jeep Rubicon."