i have a 96 xj. dana 44 up front and 9in in rear. 6.5in springs n front and has stock rear leafs with adjustable shackles. i thought about just buying 6.5in lift leafs but i would really like to move axle back. i read people run mj comanche leafs and shackle relocations kits. then i read people run s10 springs... ect.. whats the best leaf spring set up to run so i can move axle back and have good flex? if i had the money rite now id just 4 link it but i dont lol
How much do you want to move it back? Flipped XJ spings give a 6" stretch and YJ springs give a 3" stretch. If all you want is an inch or two you can use spring perches that have multiple mounting holes for the centering pin. You'll also need to move the gas tank and shock mounts as well as lengthen the drive shaft if you go more than 3", drive shaft if more than an inch depending on what type you're running.
4" will mean relocating the gas tank and cutting a good bit out of the rear fenders and redoing the wheel tubs. I've got about 2-2.5" on mine and it centered my wheels and didn't have to move the tank. My 60 clears by less than an inch. Also didn't have to change shock mounts with that much.