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This guide covers the replacement of front air suspension struts on 2003-2006 Ford Expedition and Lincoln Navigator models. The system uses electronically controlled air springs integrated with the strut assembly, typically operating around 90-150 psi. Begin by lifting the vehicle and supporting the frame. Remove the wheel and disconnect the upper strut retaining nut, sway-bar link, brake line bracket, and air line. Mark the mounting orientation before removing the lower knuckle bolts. Install the new strut by reversing removal, verify airline sealing, and use a scan tool to command the suspension to ride height. Torque all fasteners to factory specifications and perform a system bleed if required.