you will need new ubolts, new shocks to compensate length(stock shocks too short), possibly a drop pitman arm. if you choose to keep swaybar get some swaybar disconect links if not ditch them. ditch the tracbars too. thats the bar that connects to frame to axle. on leaf spring yjs they are not needed as the springs themselves are strong enough to center the axle. you will need brakeline extension brackets or just buy longer lines. a transfer case drop kit you will need to compensate for driveline vibs if it has any. trust me you will feel what a driveline vibration feels like. if you got the $ buy a sye kit and new driveshaft. how hard to put on a yj lift? not difficult at all if you have the right tools. the really lengthy part sometimes considered hardpart is taking all the stock old stuff off as the bolts could be rusted and may require cutting off which is time consuming. when i did my yj lift most of the old stuff came off except ubolts, and frame to spring bolts and swaybar links.
"Its a Jeeps World, other 4x4s just get stuck in it."