Chevrolet Low Cab Forward 4500 2019 Series Owner's Manual page 168

2. Start the engine and move the
selector lever into D6/D4 for
forward movement, or R for
backward movement while
firmly pressing the brake pedal
with your right foot.
3. Make sure that the shift
indicator indicates the correct
gear (D6/D4 for forward
movement, or R for backward
movement), release the
parking brake, release the
brake pedal, and then
gradually press the accelerator
pedal. The vehicles starts
moving as you press the
accelerator pedal further.
On a steep slope:
Make sure that the shift indicator
indicates the correct gear (D6/D4 for
forward movement, or R for
backward movement), check the
area around the vehicle is clear,
release the brake pedal with your
right foot, and then slowly press the
accelerator pedal.
After you feel the vehicle start
moving, gradually release the
parking brake lever and start driving
the vehicle.
When the brake pedal is not
pressed, the shift lock system
operates and the selector lever
cannot be shifted from P to any
other position.
See Starting and Stopping the
Vehicle 0 154, Selector Lever 0 172,
and Automatic Transmission Shift
Lock Control Function Check 0 215.
Normal Driving
When you move the selector lever
from P into D6, shifting takes place
in the automatic mode. Check that
D6 is displayed in the shift indicator.
If the automatic transmission fluid
temperature is too low, the
transmission may not initially make
automatic shift to the 4th, 5th, and
6th gear. This condition is normal
and will be resolved as the fluid
temperature rises.
Driving and Operating
To Accelerate
To accelerate when the accelerator
pedal is pressed further, kickdown
operates and the speed increases.
The transmission will downshift at
speeds below 112 km/h (70 MPH) to
provide greater acceleration.
Kickdown
If you press the accelerator pedal
fully while driving, in accordance
with the current speed the gear
automatically shifts down and the
engine speed rises, enabling
sufficient acceleration. This is called
kickdown.
You can easily accelerate to the
required speed when overtaking
other vehicles or when joining traffic
on a highway. In order to maintain
speed when driving on an uphill
road, as you gradually press the
accelerator pedal the engine may
automatically shift down in
accordance to the current speed
(shifts to a lower speed gear),
increasing the engine speed and
increasing vehicle speed.
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