Out back, the factory leaf springs are notorious for sagging. If you are on a budget, it is easy to cobble together a spring pack that will work well and resist axlewrap. The Cherokee leaf springs are 2 1/2 inches wide, so many later model pickups can donate leafs to build an at-home custom pack. Look at small trucks like the Comanche, Dakota, Durango, S-10, and Ranger. Keep the factory XJ main leaf and throw the rest of the stock stuff out. Make sure the second leaf is as close to the same length as the Cherokee main leaf as possible. If you’ve got a bit more cash, we really like the Old Man Emu springs. If you want to convert to spring-under, both Alcan and Deaver are good choices and have lots of XJ experience.