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Note:
The AdvanceTrac® with RSC® stability
enhancement system can be switched off
by deselecting the feature in the cluster
menu. See Using Traction Control (page
243). This disables the engine management
feature, allowing the vehicle to maintain full
power and enhanced momentum through
the obstacle.
Note: The AdvanceTrac system can take
control of the transfer case clutch and
disable it during driving maneuvers when
necessary.
Your vehicle engages 4X4 modes based on
the currently selected Drive Mode.
See
Drive Mode Control (page 299).
Note: The information display could show
messages during 4WD operation.
See
Information Messages (page 138).
2H - 4X2
2H turns on when you select
NORMAL or
CONSERVE. Power is delivered to the rear
wheels only. This mode is appropriate for
normal on-road driving on dry pavement and
provides the best fuel economy. 4A - 4X4 Auto
4A turns on when you select
EXCITE,
NORMAL 4x4 AUTO or SLIPPERY. It
provides electronically controlled four-wheel
drive with power delivered to all four wheels,
as required, for increased traction. 4A is
calibrated in conjunction with Drive Mode.
4A in EXCITE is less aggressively tuned and
is appropriate for dry road surfaces. 4A in
NORMAL 4x4 AUTO
is appropriate for all
on-road driving conditions, such as dry road
surfaces, wet pavement, light snow or gravel.
4A in
SLIPPERY is more aggressively tuned
and is appropriate for slippery surfaces, such
as light snow or gravel.
4H - 4X4 High
4H turns on when you select
DEEP
CONDITIONS. It provides electronically
locked four-wheel drive power to both the
front and rear wheels for use in off-road or
winter conditions such as deep snow, sand
or mud. This mode is not for use on dry
pavement. 4L - 4X4 Low - (If Equipped)
4L turns on when you select
SLOW CLIMB.
It provides electronically locked four-wheel
drive power to both the front and rear wheels
for use on low traction surfaces, but does so
with additional gearing for increased torque
multiplication. Intended only for off-road
applications such as deep sand, steep
grades or pulling heavy objects. 4L does not
engage when your vehicle is moving above
3 mph (5 km/h); this is normal and should be
no reason for concern.
Shifting Between 4WD System Modes
Note: Momentarily releasing the accelerator
pedal when a shift in progress message
displays improves engagement and
disengagement performance.
Note: Do not perform this operation if the
rear wheels are slipping.
Note: You may hear some noise as the
system shifts or engages; this is normal.
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Navigator (TB9) Canada/United States of America, enUSA, Edition date: 201907, Second-Printing Four-Wheel Drive
(If Equipped)
Page 436 of 622

7.
Reinstall the jack properly on the bracket
and secure with the wing nut. 8. Close the access hole with the rubber
plug. 9. If the vehicle has an access panel,
reinstall.
10. Unblock the wheel.
TECHNICAL SPECIFICATIONS
Wheel Lug Nut Torque Specifications WARNING: When you install a wheel, always remove any corrosion, dirt or foreign m\
aterials present on the mounting surfaces of the
wheel or the surface of the wheel hub, brake drum or brake disc that contacts the wheel. Make sure to secure any fasteners that attach
the rotor to the hub so they do not interfere with the mounting surfaces\
of the wheel. Installing wheels without correct metal-to-metal contact
at the wheel mounting surfaces can cause the wheel nuts to loosen and th\
e wheel to come off while your vehicle is in motion, resulting in
loss of vehicle control, personal injury or death. lb.ft (Nm)
1
Bolt Size
150 lb.ft (204 Nm)
M14 x 1.5
1 Torque specifications are for nut and bolt threads free of dirt and rust.\
Use only our recommended replacement fasteners.
Retighten the lug nuts to the specified torque within 100 miles (160 kil\
ometers) after any wheel disturbance, such as tire rotation, changing a
flat tire or wheel removal.
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Navigator (TB9) Canada/United States of America, enUSA, Edition date: 201907, Second-Printing Wheels and Tires
Page 450 of 622
Transfer Case
Capacities
Quantity
Variant
1.5 qt (1.4 L)
Four-wheel drive with torque on demand.
1.6–1.8 qt (1.5–1.7 L)
Four-wheel drive with electronic shift on the fly.
Materials Specification
Name
MERCON® LV WSS-M2C938-A
Motorcraft® MERCON® LV Automatic Transmission Fluid (U.S.)
Motorcraft® MERCON® LV Automatic Transmission Fluid / Huile pour boîte auto-
matique MERCON® LV Motorcraft® (Canada)
XT-10-QLVC (U.S.)
CXT-10-LV6 (Canada)
Front Axle
Capacities Quantity
Variant
1.8 qt (1.7 L)
All.
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Navigator (TB9) Canada/United States of America, enUSA, Edition date: 201907, Second-Printing Capacities and Specifications