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Rear AxleLIMITED SLIP DIFFERENTIAL(IF EQUIPPED)This axle provides added traction onslippery surfaces, particularly when onewheel is on a poor traction surface. Undernormal conditions, the limited-slip axlefunctions like a standard rear axle. The axlemay exhibit a slight noise or vibrationduring tight turns with low vehicle speed.This is normal behavior and indicates theaxle is working.ELECTRONIC LOCKINGDIFFERENTIAL (IF EQUIPPED)Note: The electronic locking differential isfor off-road use only and is not for use ondry pavement. Using the electronic lockingdifferential on dry pavement will result inincreased tire wear, noise and vibration.The electronic locking differential is adevice housed in the rear axle that allowsboth rear wheels to turn at the samespeed. The electronic locking differentialcan provide additional traction should yourvehicle become stuck. You can activatethe differential electronically and shift iton the fly within the differential operatingspeed range. The differential is for use inmud, rocks, sand, or any off-road conditionwhere you need maximum traction. It isnot for use on dry pavement.The following conditions will affect theelectronic locking differential:• The electronic locking differential willnot engage if your vehicle speed isabove 20 mph (32 km/h) in 4x2, 4x4Auto, or 4x4 High modes• The electronic locking differential willnot engage if your vehicle speed isabove or 56 mph (90 km/h) in 4X4Low• The electronic locking differential willnot engage if you press youraccelerator pedal beyond 50% duringan engagement attempt• In 4x2, 4x4 Auto, and 4x4 High modes,the electronic locking differential willautomatically disengage at speedsabove 25 mph (41 km/h) and willautomatically reengage at speedsbelow 20 mph (32 km/h)• In 4L (4X4 low), the electronic lockingdifferential will automaticallydisengage at speeds above 62 mph(100 km/h) and will automaticallyreengage at speeds below 56 mph (90km/h)• The AdvanceTrac system has theability to take over control of theelectronic locking differential anddisable it during driving maneuverswhen necessaryWhen you switch the system on, if you donot meet the required conditions forelectronic locking differential activation,the instrument cluster will display theappropriate information guiding youthrough the proper activation process.Activating the Electronic LockingDifferential (If Equipped)Note: Do not use electronic lockingdifferential on dry, hard surfaced roads.Doing so will produce excessive noise,vibration and increase tire wear.Note: If the electronic locking differentialhas difficulty disengaging, release theaccelerator pedal and turn the steeringwheel in the opposite direction while rolling.161F150 (TF6) , enUSA