There's a link that's been posted here several times to a write-up on earlycj5.com (you can try going over there and looking for the write-up). It's not as simple as krazy makes it sound...the info he gave you applies to '76 and up. You have to change all of your spring & shackle hangers and figure out the correct spacing for them when positioning them on the frame.
'86 CJ-7 Laredo: 4.2,T-999,D300,D30/D44,'94 YJ tub, full cage, Shrockworks rockers, OYR corners, AC,cruise,restored seats,3 tops,2.5" Superlift,F-T shackle reversal, RS9000x's,35" Dunlop Mud Rovers.
'83 Scrambler: time & money pit under construction with parts from CJ's,YJ's,TJ's,FSJ's,GM,Ford,IH,Honda,Toyota and a whole lotta aftermarket & custom stuff.