It's not too hard. A friend and I lifted a late 70's CJ-7(Spring Lift) in the mid 80's to where 39" tires would fit it. We also decided to mount Dana axles from a Chevrolet pickup for extra stability. The axles were mounted on the bottom of the springs for added height, stock Jeep axles were mounted on top of the spring. Later a Chevrolet 350 CID engine was installed with a nitrous oxide kit. It made a quite good mud-bogger.
 I don't remember what spring kit we used. Remember though, if you get radical with the lift, the steering shaft and box may have to be relocated and/or modified. 
Thanks for the info shroom.  I have a couple of trips I need to make in the next month and then  I'll go ahead and actually get to it an lift the darned thing.  I'm only thinking of getting a 3" lift kit or so.  Not more than that.
Hey Matt, remind me never to take my car to you for work!   

  Two problems with your suggestion:  1.) I don't think 4 people can lift a jeep in the manner that you are suggesting.  There has to be a better way.  2.) I don't think I can find 4 friends. 
