8.Obviously, there are much cheaper differential options than an ARB locker. But since this Cherokee was going to be a daily driver, there is just no way we could opt for anything but completely manually-selectable lockers for the axles. The ARB units offered a high price, but they also offered the strength and selectability we were after. They would be an acceptable splurge.
Besides the ARB, all we had to get to finish the rear end off was a Superior 5.13:1 ring-and-pinion and install kit from Superior Axle.