Several attempts may be required for teeth alignment
and shift completion to occur. The preferred method is
with the vehicle rolling 2 to 3 mph (3 to 5 km/h). Avoid
attempting to engage or disengage 4L with the vehicle
moving faster than 2 to 3 mph (3 to 5 km/h).
•
Do not attempt to shift into or out of 4L while the
transmission is in gear.
Transfer Case Position Indicator Light
The Transfer Case Position Indicator Light in the instru-
ment cluster is used to alert the driver that the front
axle is fully engaged and all four wheels are driving.
AIR SUSPENSION SYSTEM — IF EQUIPPED
DESCRIPTION
This air suspension system is a rear leveling ride height
system. The main purpose of this system is to maintain
the truck’s rear ride height level. There are two select-
able heights that can be chosen based on your operat-
ing conditions.
The system requires that the ignition be in the ON/RUN
position or the engine running.
Standard Ride Height (SRH) – This is the standard posi-
tion of the suspension and is meant for normal driving.
It will automatically adjust to maintain the rear ride
height as conditions change.
Alternate Trailer Height (ATH) – Lowers the vehicle
approximately 1 inch (25 mm) for a level truck, to be
used as required while trailer towing. It will automati-
cally adjust to maintain the rear ride height as condi-
tions change.
NOTE:
If lightly loaded, 3500 models will lower as close to 1
inch (25 mm) as possible.
Trailer Decoupling/Unloading – The air suspension
system will continue to load level after the vehicle has
been turned off for 5 minutes without compressor acti-
vation. This allows for easy removal of a trailer and/or
load from the back of the truck by maintaining the ride
height. After 5 minutes you will need to turn the ignition
to the ON/RUN position for the air suspension to
re-level due to addition/removal of load in the vehicle. If
the air suspension system is disabled using the settings
menu (Tire Jack Mode, Transport Mode, Alignment
Mode, or Bed Lowering Mode) the system will remain
disabled when the vehicle is turned off. Reactivating
the air suspension can be accomplished via the set-
tings menu or driving the vehicle above 5 mph (8 km/h)
for Tire Jack Mode, Alignment Mode, Transport Mode
and Bed Lowering Mode.
NOTE:
•
Most 3500 models will not lower to Alternate Trailer
Height (ATH) when unloaded.
•
For further information page 156.
WARNING!
The air suspension system uses a high pressure vol-
ume of air to operate the system. To avoid personal
injury or damage to the system, see an authorized
dealer for service.
AIR SUSPENSION MODES
The air suspension system has multiple modes to pro-
tect the system in unique situations:
Tire/Jack Mode
To assist with changing a tire, the air suspension sys-
tem has a feature which allows the automatic leveling
to be disabled
page 85 or page 174.
NOTE:
This mode is intended to be enabled with the engine
running.
Transport Mode
For towing your vehicle with four wheels off the road,
the air suspension system has a feature which will put
the vehicle into Bed Lowering Mode and disable the
automatic load leveling system
page 85 or
page 174.
NOTE:
This mode is intended to be enabled with the engine
running.
Wheel Alignment Mode
Before performing a wheel alignment, this mode must
be enabled
page 85 or page 174.
Rear Leveling Ride Height Switch
STARTING AND OPERATING 113
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