DRIVE (D):This position is for normal driving.
It provides the best fuel economy for your vehicle.
If you need more power for passing, and you are:
Going less than about 35 mph (55 km/h), push
your accelerator pedal about halfway down.
Going about 35 mph (55 km/h) or more, push
the accelerator all the way down.
By doing this, the vehicle shifts down to the next
gear and has more power.
DRIVE (D) can be used when towing a trailer,
carrying a heavy load, driving on steep hills, or for
off-road driving. You may want to shift the
transmission to a lower gear selection if the
transmission shifts too often.
Downshifting the transmission in slippery road
conditions could result in skidding, see Skidding
underLoss of Control on page 338MANUAL MODE (M):This position lets drivers
select the range of gears appropriate for current
driving conditions. If your vehicle has this feature,
see Driver Shift Control (DSC) later in this
section.
Notice:Spinning the tires or holding the
vehicle in one place on a hill using only the
accelerator pedal may damage the
transmission. If you are stuck, do not spin the
tires. When stopping on a hill, use the
brakes to hold the vehicle in place.
Your vehicle has a shift stabilization feature that
adjusts the transmission shifting to the current
driving conditions in order to reduce rapid upshifts
and downshifts. This shift stabilization feature is
designed to determine, before making an upshift, if
the engine will be able to maintain vehicle
speed by analyzing things such as vehicle speed,
throttle position and vehicle load. If the shift
stabilization feature determines that a current
vehicle speed cannot be maintained, the
transmission does not upshift and instead holds
the current gear. In some cases, this may appear
to be a delayed shift, however the transmission
is operating normally.
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Your vehicle’s transmission uses adaptive shift
controls that compares key shift parameters
to pre-programmed ideal shifts stored in the
transmissions computer. The transmission
constantly makes adjustments to improve vehicle
performance according to how the vehicle is
being used, such as with a heavy load or when
temperature changes. During this adaptive
shift controls process, shifting may feel different as
the transmission determines the best settings.
When temperatures are very cold, the
Hydra-Matic
®6L80 automatic transmission’s gear
shifting may be delayed providing more stable
shifts until the engine warms up. Shifts may
be more noticeable with a cold transmission. This
difference in shifting is normal.
Driver Shift Control (DSC)
Your vehicle has a Driver Shift Control (DSC). The
DSC controls the vehicle’s transmission and
vehicle speed while driving down hill or towing a
trailer by allowing you to select a desired range of
gears.
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Grade Braking
Grade Braking assists when driving on a downhill
grade. It maintains the vehicle’s speed by
automatically implementing a shift schedule that
uses the engine and the transmission to slow
the vehicle. This reduces wear on the brakes
system and increases control of the vehicle. The
system constantly monitors the vehicle’s speed,
acceleration, throttle position, and whether
the brake pedal is being pressed, and determines
when to keep the current vehicle speed or to
slow down. The system will then automatically
command downshifts that reduces the vehicles
speed, until the brake pedal is no longer
being pressed. This indicates the desired vehicle
speed has been reached.The tow/haul mode and grade braking shift modes
can be activated by pressing the button on the
end of the shift control stalk. While in the
DSC mode, grade braking is deactivated, allowing
the driver to select a gear.
SeeAutomatic Transmission Operation on
page 129for more information.
Parking Brake
To set the parking brake, hold the regular brake
pedal down with your right foot. Push down
the parking brake pedal with your left foot.
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