Ford TRANSIT 2017 Owner's Manual page 148

Transmission
If Your Vehicle Gets Stuck in Mud
or Snow
Note: Do not rock the vehicle if the engine
is not at normal operating temperature or
damage to the transmission may occur.
Note: Do not rock the vehicle for more than
a minute or damage to the transmission and
tires may occur, or the engine may overheat.
If your vehicle gets stuck in mud or snow,
you may rock it out by shifting between
forward and reverse gears, stopping
between shifts in a steady pattern. Press
lightly on the accelerator in each gear.
145
Transit (TTH) Canada/United States of America, HK3J 19A321 AA enUSA, Edition date: 04/2016, First Printing