FWIW, I am going to modify my steering box to feed a hydraulic assist cylinder and was asked by one of the providers which box I had. He said that the later Jeep boxes had moved the lower sector shaft bearing up to get the seal up inside the housing away from dirt. Doing this, however, created a longer distance from the bearing to the pitman arm, which is more prone to flexing and taking the seal out sooner. The added distance causes the sector shaft to be more prone to breaking. My Waggie box has the seal down at the bottom, so is the better of the two designs. I don't know where the change took place and neither did he. He said it was easy to see the difference by looking at the output of the sector shaft for the seal location. If it is at the "VERY" bottom, it's the better design.
97 ZJ 5.2, 3.8 Atlas TC, 488s, 8.8 rear w/ARB locker, hp30 w/Oxlocker, Alloys F&R, 35" KM2s, 7" Clayton L A, ARB Bull Bar/Warn, ProtoFab w/ tire carrier, Clayton skid, rock sliders, ORO dual rate Swaybar, Redneck steering assist
97 TJ Juggy, 350 V8, 700R4, D60, 14 bolt, locked, 14" ORI Struts, 113" wb, 42" Pit Bulls, Stazworks beadlocks, F&R winches, caged, Anti-Rock, PSI full hyd steering,