The 4x4 or 4WD Auto Locking Hubs are located on the front wheel hubs of your Ford F250, F350, F450, F550 Super Duty, Ford Expedition, Excursion, or Lincoln Navigator.. These hubs connect to the axle assemblies and control how power is transferred from the axle to the fronts wheels of your truck. If your 4x4 system is not working properly a failing actuator is likely the cause. This actuator is a direct replacement for both the front right (passenger side) and front left (driver side) actuator on your Ford.