Ford F series Owner's Manual page 174

NOTE: Change rear axle lubricant if the axle
has been submerged in water.
NOTE: Refer to the Diesel Engine Owner's
Guide Supplement for driving through
deep water information.
Additional Special Driving
Instructions for 4-Wheel Drive
Vehicle Operators
Driving on Hill or Slope Terrain
When driving on a hill, avoid driving crosswise
or turning on steep slopes, you could lose
traction and slip sideways. Drive straight up,
straight down or avoid the hill completely.
Know the conditions on the other side of a hill
before driving over the crest.
When climbing a steep hill, start in a lower gear,
rather than finding it necessary to downshift
from a higher gear after the ascent has started.
This reduces strain on the engine and the
possibility of stalling.
When descending a steep hill avoid sudden
braking. Rapid pumping of the brake pedal will
help slow the vehicle and still maintain steering
control.
Driving on Snow or Ice
A four-wheel drive vehicle has advantages over
two-wheel drive vehicles in snow and ice but
can skid like any other vehicle. If so equipped,
keep the vehicle in four-wheel drive if icy or
slippery conditions exist.
Avoid sudden applications of power and quick
changes of direction on snow or ice. Apply the
accelerator slowly and steadily when starting
from a full stop.
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