2011 Ford F450 Super Duty Crew Cab Owner Guide 4th Printing - Page 281

Driving For 2WD vehicles and vehicles equipped with a manual shift 4WD system: Turn the control to ON. The indicator light will display in the instrument cluster. light is displayed in the instrument cluster, both rear wheel Once the axle shafts will be locked together providing added traction. indicator light in the instrument cluster turns off, one of the If the following has occurred: • The vehicle speed is too high. • The left and right rear wheel speed difference is too high during an engagement attempt. • The system has malfunctioned and will be accompanied by the CHECK LOCKING DIFFERENTIAL message in the message center. See your authorized Ford dealer for assistance. Note: The ELD may have difficulty disengaging either by operator command or automatically if the driveline is under torque. If driving conditions allow, releasing the accelerator pedal or turning the steering wheel in the opposite direction may assist in disengagement. Note: The ELD is designed for off-road use only and is not intended for use on dry pavement. PREPARING TO DRIVE WARNING: Utility vehicles have a significantly higher rollover rate than other types of vehicles. WARNING: In a rollover crash, an unbelted person is significantly more likely to die than a person wearing a seat belt. Utility vehicles and trucks have larger tires and increased ground clearance, giving the vehicle a higher center of gravity than a passenger car. 281 2011 F-250/350/450/550 (f23) Owners Guide, 4th Printing USA (fus)