4WD Vacuum Hub Axle Actuator Locking 7L1Z-3C247-A For Expedition 04-15 F150 03-15 This 4WD vacuum hub axle actuator is designed for use with Expedition models from 2004 to 2015 and F150 models from 2003 to 2015.It enables the locking mechanism of the front wheel hubs through vacuum , supporting engagement and disengagement of the four-wheel drive system.The actuator replaces 7L1Z-3C247-A and is built to match specifications for fitment and function.It connects directly to the vehicle's vacuum system and works in conjunction with the front axle disconnect mechanism to provide 4WD performance under various driving conditions.