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The Powertrax is a component kit, which replaces the gears in a stock differential case with a locking differential. An inner coupler replaces the side gear and splines onto the axleshaft. The coupler's straight-cut drive teeth on its face side match the teeth on the driver, which is pinned to the case with a heavy shaft. An active spacer between the two works through a syncro system to allow the differential to lock and unlock.