Here's a good website for XJ owners
ericsxj.com/ AND... he authored a
GREAT book! Even if you don't want to Wheel ur XJ, but want to know more about it and maybe do some work on it, this book CAN'T be beat. Here's a good deal, of course, you can always get it on Amazon.
(I removed the link, it was bad, here's the eBay Auction #250888563738, it was going for $20.77 Shipped, not a bad deal) Of course if doesn't matter WHERE you get it, just as long as you get it!
If your Wrangler had a 4 cyl, it would've had 4.11 gears in the Diffs. If it also had a manual Trans, the first gear would be a lot lower then the first gear in the AW4 you have now
plus this XJ (unless it has a Factory Tow Package) will have 3.55 gears. That all makes a difference. The Good News is... your late model XJ has bigger rear axle shafts, 29 Splines, compared to '96 and earlier which only have 27 Splines.
Jack