I have leaves on the front of my MJ. I'm using Waggy 44's front and rear with YJ 4" ProComp leaves up front and the MJ rear leaves over-the-axle. I used YJ confer shackles up front (I think they are 1.5"ers), with a main eye leaf from stock YJ pack welded to steel reinforcements on front bumper. In the rear of the front lower CA mount we cut a window in the outside LCA reinforcement to get a bolt in there for the eye on the rear of the leaf pack. The MJ's have a heavily reinforced LCA. Leaf spring fits right in there. I made some shock mounts for the front out of 1/4 angle that bolt on top of the outside u-bolts on each side.
I used two XJ shackles per side in the rear, with a piece of angle welded inbetween for the second shackle to rest on. I'm not sure how much lift, I think about 8"s, enough to clear 38x14.50's on 10" rims with 3.75 B.S. I'm using adj. Ranchos, "and the ride, I said the ride, is so sweet, you must be a limmosine..." Woops, jumped into a little Prince (ess) there.
Right now I'm using the MJ trac bar, shortened and sleeved to fit the Waggy axle mount. I have a "z" bent Waggy drag link (with a ZJ TRE, and a ZJ pitman arm), and a standard Waggy tie-rod. This I'm going to change for over knuckle steering very soon. I have some flat top knuckles from a K-5 blazer D-44. I'm going to buy some high steer arms, use Chebby TRE's and some thick a** tie rod and drag links.
You will want to bump the rear axle width a bit with some spacers. I'm using 1.5" spacers per side.
My D-shafts bolted right up, I added some u-bolt style pinions. I have plenty of flex with this set-up.
Here are some pics, it's not quite finished;