Locker refers to the type of rear locking differential in your Jeep. Shift on the fly refers to the fact that you can engage 4wd from the comfort of a button. Dana 35 refers the type of rear axle housing/assembly. Dana is the name of the manufacturer. The rear wheels are attached to axles. Axles transmit power to the wheels from the differential. The transmission transmits power to the differential by the driveshaft
