Some further info , .......
When preparing to weld the spring perches on the rear axle tubes , consider it to be an opportunty to adjust the driveline angles. Additionally if you have a bolt in lift kit , the spacers , used to lower the transfer case can be removed to gain back lost ground clearance . All of this is best done by using a slip yoke eliminator kit on your transfer case and having a double cardon driveshaft built. Excellent driveline angles can be achieved this way , rotating the axle up to point at the TC output yoke , a few degrees lower as a matter of fact , to allow for pinion angle variance / axle wrap.
On mine , I had D.S.I. build two new driveshafts for me , my front needed to be shortened , while writing up the work order at the front counter , it was discovered that my front driveshaft had a slight twist in it , I had them go ahead and build a new one , using heavier tubing. Due to the length of the front shaft and the driveline angles being acceptable , it wasn't necessary to use a double cardon driveshaft in the front.
If you are going spring over , consider using an anti axle wrap bar. Here's one I built.............
It's on the third page , the whole thread is of interest , having bought a seriously messed up 94 YJ and pretty much having to rebuild it end to end , all mechanical repair little to no cosmetic work.
http://www.whiteknight.ca/FORUMS/index.php?showtopic=2784&hl=Ghetto+YJ