Here's the trick... I'll presume you have a blown rear-end.
Remove the rear-end, and take it with you to a junkyard.
Ask them for a matching rear-end with a matching axle ratio.
If you don't get what I mean here, axle ratio is VERY VERY VERY important to be matching on a 4wd.
According to the specs I found, you could have a 3.07, 3.73 or 4.11 ratio. You probably have the 3.73 unless you got one of the other special models....
Axle Ratio
3.73 - 2.4L and 4.0L; 3.06 - Std. X and Sport; 4.11 - Rubicon