Chevrolet Low Cab Forward 6.7L 2022 Owner's Manual page 164

Normal Driving
When you move the selector lever from "P"
(models with P-range) or "N" (models
without P-range) into "OD", shifting takes
place in the automatic mode. Check that
"OD" 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.
To Accelerate
To accelerate when the accelerator pedal is
pressed further, kickdown operates and the
speed increases. The transmission will
downshift at speeds below
88 km/h (55 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.
Driving and Operating
Driving Uphill or Downhill
Uphill driving:
With the selector lever in OD, if you press
down on the accelerator pedal, kickdown
(change to a low speed gear) may operate
causing the engine revolutions to suddenly
increase (increasing the speed).
Driving for a prolonged duration on an
uphill road with the selector lever in OD
may cause the automatic transmission fluid
to overheat.
Drive with the overdrive off switch ON to
keep the engine revolutions constant to
enable smoother driving with fewer changes
in engine revolutions.
Drive with the selector lever in the 3
position to keep the engine revolutions
constant to enable smoother driving with
fewer changes in engine revolutions.
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