which one? OTK or UTK? i beleive that the OTK setup is the same rods, just with a different joint and setup over the knuckle. there is more fab work involved with goin OTK, so depending on your skills you may want to have them install it if you go that route.
i know many people that have ran their steering under the knuckle and liked it
I have the JCR 1-ton setup on my XJ axles (the ones for sale) in the OTK configuration with the bushings and a dropped pitman arm with 8" of lift. It will require you to rework your sway bar bracketry on the axle. The easy solution for me was to use Teraflex sway bar brackets that weld to the knuckle yoke. Also had the lower track bar bracket relocated higher up, like at about 10-11:00 on the tube. Got everything up and out of the way of the rods. Like it very much. XJ is very stable and handles very well at highway speeds.