1. The TJM Pro Locker has a one-piece cross shaft and four large pinion gears inside the thick carrier. It works with mechanical movement of the internal selector ring by the fork on the actuator (a separate unit not shown in this diagram). The selector ring engages the locking ring which locks the side gear to the carrier and immobilizes the ability for axleshaft speed differentiation, thus turning the open differential into a fully locked unit. The Pro Locker is available for the Dana 44 and Toyota Tacoma and Land Cruiser axles. Dana 30 and Dana 60 applications are coming.