Chevrolet Low Cab Forward 6.7L Diesel Engine 6500XD (GMNA-Localizing-
U.S.-15749874) - 2022 - CRC - 12/1/21
168
Driving and Operating
Selector Lever
Models with ALLISON2550RDS Model
Transmission
Move the selector lever to make a shift into
each gear position.
P (Parking) :
Used when the vehicle is
parked or when starting the engine. The P
position is to be used with the parking
brake. The P and N positions are the two
positions in which the engine can be started.
R (Reverse) :
Used when backing up the
vehicle. Bring the truck to a complete stop
before moving the selector to the R position.
N (Neutral) :
Can be used when starting the
engine, but for safety, get in the habit of
starting the engine in the P position. See
OD (Normal Driving) :
The OD position is for
all normal forward driving. The system
automatically selects the gear according to
the vehicle speed. Press the overdrive off
switch to switch to the overdrive "ON"
position for greater fuel economy.
3 (Third) :
Used when driving on urban roads
with heavy traffic. Return the selector to the
OD position for normal driving.
2 (Second) :
May be used when driving on
downhill roads or when the engine brake is
required. Select the 2 position at speeds
below 40 km/h (25 MPH) when traveling
down a moderate grade. Return the selector
to the OD position for normal driving.
1 (Low) :
Used on steep downhill roads or
when strong engine braking is required.
Return the selector to the OD position for
normal driving.
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Warning
When pulling away, always visually check
the position of the selector lever for
safety.
Only push the button for gear selection
when necessary. Pushing the button
unnecessarily may result in unintended
gear selection.
Never move the selector to the P position
when the truck is in motion.
Do not run the vehicle with the
transmission in neutral. Not only will the
engine brake not function, but the
transmission will also be damaged. You
and others could be seriously injured.
When repeatedly shifting between forward
and reverse gears for a multiple-point turn,
firmly press the brake pedal and confirm
that the vehicle is completely stopped
before operating the selector lever.
The selector lever cannot be moved from
the "P" position unless the engine control
switch is in the "ON" position, the brake
pedal is depressed and the air tanks have air
pressure sufficient to activate brake lights.
Before pulling away, be sure to keep the
