If you're going through the trouble of a spring-over lift, might as well install stronger axles while you're at it. Jeep Wagoneer d44 front and Isuzu Rodeo d44 rear are a good combination, similar width to the stock axles, 4whl disc brakes, and matching 6-lug at all 4 corners. JP Mag did an install of a pair a few years back, same set I've got in mine. Getting ready to put another set in a friend's YJ.
Advantage of the d44 is a stronger housing, stronger axleshafts, serviceable bearings, locking hubs, more inexpensive highsteer options, lower gearing options, more plentiful and affordable locker and gear choices.