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STARTING AND OPERATING 157
With the vehicle rolling at 2 to 3 mph (3 to 5 km/h),
shift the transmission into NEUTRAL. While the
vehicle is coasting at 2 to 3
mph (3 to 5 km/h),
shift the transfer case lever firmly to the desired
position. Do not pause in transfer case Neutral.
NOTE:
Pausing in transfer case N (Neutral) in vehicles
equipped with an automatic transmission may
require shutting the engine off to avoid gear
clash while completing the shift. If difficulty
occurs, shift the transmission into NEUTRAL,
hold your foot on the brake, and turn the engine
off. Complete the range shift to the desired
mode.
Shifting into or out of 4L is possible with the
vehicle completely stopped, however difficulty
may occur due to the mating clutch teeth not
being properly aligned. Several attempts may be
required for clutch 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
instrument 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 selectable heights that can be chosen
based on your operating conditions.
The system requires that the ignition be in the ON/
RU
N position or the engine running with zero
vehicle speed for all user requested changes and
load leveling.
Rear Leveling Ride Height Switch
Normal Ride Height (NRH) –
This is the standard
position 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
b
e
used as required while trailer towing. It will
automatically adjust to maintain the rear ride
height as conditions change.
Trailer Decoupling/Unloading - The air suspension
system will continue to load level after the vehicle
has been turned off for 10
minutes without
compressor activation. This allows for easy
removal of a trailer and/or load from the back of
the truck by maintaining the ride height. After
10
minutes you will need to turn the ignition to the
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 settings menu or driving the
vehicle above 5
mph (8 km/h) for Tire Jack Mode,
Al
ignment Mode, Transport Mode and Bed
Lowering Mode.
NOTE:
Most 3500 models will not lower to Alternate
Trailer Height (ATH) when unloaded.
For further information Ú page 210.
4
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