Guys,
Thanks for all of the info. You have been a huge help! It's sounds like the spool is the way to go. Because a few of you asked, here is the skinny on my XJ. 87 Limited, D44R, D30F, NP242, AW-4, 4.0L. Right now it's at the welder getting floors. It was one of those deals you can't pass up..$500. Anyway, I plan on a 6" Tomken Ultra Flex, Spool in the D44, and ARB in the front, 4.56 gears. Also, I will be replacing the drive shafts with CV shafts. I cut the skins, so I should be able to get the Procomp 35X12.5XR15 Xterrains I bought under it. They'll be monted on Eaton 15X8 steelies. I did a few of the basic mods to the 4.0L, you know larger TB and spacer, K&N. I got front and rear bumpers from Truckfarm, and seats from Mastercraft. That should be enough for now. Thanks again.
Jack