I think he got confused by the title. Locking hubs are not used from the factory on your Jeep, instead they use the 2 piece axle with the vacuum actuator. The vacuum systems can be problematic from time to time so many people switch to the Posi-Lok like you have. I used it on mine when I had stock axles and it was great. I liked knowing that the front axle was engaged after stripping the splines off of a couple of shafts with the factory set up. You also have a 2-low option by not engaging the Posi-Lok and shifting the t-case into 4-low.