FORD 2013 Explorer v.3 - Manual (Page 369)

Four-Wheel Drive (4WD) System (if equipped)
WARNING: Do not become overconfident in the ability of 4WD
vehicles. Although a 4WD vehicle may accelerate better than
two-wheel drive vehicle in low traction situations, it won’t stop any
faster than two-wheel drive vehicles. Always drive at a safe speed.
A vehicle equipped with four-wheel drive (when selected) has the ability
to use all four wheels to power itself. This increases traction which may
enable you to safely drive over terrain and road conditions that a
conventional two-wheel drive vehicle cannot.
Power is supplied to all four wheels through a transfer case or power
transfer unit. Four-wheel drive vehicles allow you to select different drive
modes as necessary. Information on transfer case operation and shifting
procedures can be found in the Transmission chapter. Information on
transfer case maintenance can be found in the Maintenance chapter.
You should become thoroughly familiar with this information before you
operate your vehicle.
On some four-wheel drive models, the initial shift from two-wheel drive
to four-wheel drive while the vehicle is moving can cause a momentary
clunk and ratcheting sound. These sounds are normal as the front
drivetrain comes up to speed and is not cause for concern.
368 Wheels and Tires
2013 Explorer (exp)
Owners Guide gf, 3rd Printing
USA (fus)