Re: CJ add-a-leaf on YJ
CJ springs have more arch than YJ springs, using CJ rear add-a-leafs which get 1-1/2 to 2 inches on a CJ will get you 2-1/2 to 3 inches on a YJ. I have done this on a couple YJ's to get a friend a quick and cheap lift. It ain't the best way to do it, but it does work.
I have not needed to drop the t-case or go SYE with this set up. Both of the YJ's I did were manual trans, auto may be different. Don't know what you have.
BTW just in case there is some misunderstanding I did not mean to install 2 kits front and 2 kits rear. You need 2 CJ rear kits, one for the front and one for the rear of your YJ.
This will clear 33's on the street, but they will rub off-road. A body lift will give the added clearance for articulation. Longer shackles would also do it, but you will have to check driveline angle. I have never used longer shackles with this set up so I don't know.
Like I said, I have done this for friends as a quick/cheap solution. Usually this was done to get them up and wheelin' while they saved for a better lift kit and other upgrades. One friend in particular had enough money for a good lift or enough to do this add-a-leaf job and get a Lock-Rite for the rear. I have seen them run for over a year before being replaced and there were no problems related to the lift.
My other car is a bulldozer!