Ford recommends that a flat bed tow service be utilized. If a flat bed tow truck is not available, tow the vehicle with the rear wheels lifted, front hubs unlocked (4WD models) and the steering wheel locked in the straight ahead position using a clamping device designed for towing. DO NOT lock the steering wheel using only the ignition key activated steering lock as damage to the steering column can occur.
Your truck can be towed forward with the driveshaft connected as long as you do not exceed 35 miles in distance and 50 MPH in speed. Severe damage to the transmission can occur if these limits are exceeded. If your truck has to be towed backward and is a 4WD model, unlock the front axle driving hubs, to prevent the front differential from rotating and place the transfer case in neutral. Also clamp the steering wheel on all models, in the straight ahead position with a clamping device designed for towing service.