Just been wondering about various elements that may contribute to the shaft breakages. I know there's not much difference in length but things like the shorter side failing more often, the type of locker used eg. loads coming on and off as a Lockrite locks and unlocks compared to ARB, a manual compared to an auto trans as a clutch is dumped, the size and grip of a tire and the type of surfaces you drive on and obviously how hard you drive your rig.