User Manual - Page 176

For RAM 2021 3500.

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174 STARTING AND OPERATING
NOTE:
Do not attempt to make a shift while only the
front or rear wheels are spinning, as this can
cause damage to driveline components.
When operating your vehicle in 4WD Low, the
engine speed is approximately three times that of
the two-wheel drive or 4WD High positions at a
given road speed. Take care not to overspeed the
engine and do not exceed 25 mph (40 km/h).
Proper operation of four-wheel drive vehicles
depends on tires of equal size, type and
circumference on each wheel. Any difference in
tire size can cause damage to the drivetrain.
Because four-wheel drive provides improved
traction, there is a tendency to exceed safe
turning and stopping speeds. Do not go faster
than road conditions permit.
Shifting Procedure
NOTE:
If any of the requirements to select a new
transfer case position have not been met, the
transfer case will not shift. The position indi-
cator light for the previous position will
remain ON and the newly selected position
indicator light will continue to flash until all
the requirements for the selected position
have been met. To retry a shift: return the
control switch back to the original position,
make certain all shift requirements have
been met, wait five seconds and try the shift
again.
If all the requirements to select a new
transfer case position have been met, the
current position indicator light will turn OFF,
the selected position indicator light will flash
until the transfer case completes the shift.
When the shift is complete, the position indi-
cator light for the selected position will stop
flashing and remain ON.
2WD To 4WD HIGH
Push the desired position on the four-wheel
drive control switch to shift the transfer case.
Shifts between two-wheel drive and 4WD High
can be done with the vehicle stopped or in
motion. With the vehicle in motion, the transfer
case will engage/disengage faster if you
momentarily release the accelerator pedal after
turning the control switch. If the vehicle is
stopped, the ignition switch must be in the ON
position with the engine either running or off.
This shift cannot be completed if the ignition
switch is in the ACC position.
NOTE:
The four-wheel drive system will not allow shifts
between 2WD/4WD High if the front and/or
rear wheels are spinning (no traction). In this
situation, the selected position indicator light
will flash and the original position indicator light
will remain on. At this time, reduce speed and
stop spinning the wheels to complete the shift.
2WD Or 4WD HIGH To 4WD LOW
NOTE:
When shifting into or out of 4WD Low some gear
noise may be heard. This noise is normal and is
not detrimental to the vehicle or occupants.
Shifting can be performed with the vehicle
rolling 2 to 3 mph (3 to 5 km/h) or completely
stopped. You can use either of the following
procedures:
WARNING!
Always engage the parking brake when
powering down the vehicle if the “SVC 4WD
Warning Light” is illuminated. Not engaging
the parking brake may allow the vehicle to
roll, which may cause personal injury.
21_DJD2_OM_EN_USC_t.book Page 174
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