Chevrolet 2005 Silverado 1500 Pickup Owner's Manual page 114

DRIVE (D): This position is for normal driving. 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.
You will shift down to the next gear and have 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
THIRD (3) or, if necessary, a lower gear selection if
the transmission shifts too often.
If your vehicle is equipped with the Allison
®
Transmission , it will initially attain first range when
DRIVE (D) is selected. As vehicle speed increases, the
transmission will upshift automatically through each
available range up to FIFTH (5). As the vehicle slows,
the transmission will downshift automatically.
2-28
The Allison Transmission
feature to adjust the transmission shift schedule to the
current driving situation 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 throttle position, vehicle load, and hill grade.
If the shift stabilization feature determines that 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 hanging shift,
however the transmission is operating normally.
The Allison Transmission
controls. Adaptive shift controls continually compares
key shift parameters to pre-programmed ideal shift
conditions. The Allison Transmission
adjustments to improve vehicle performance according
to the way the vehicle is being used, such as with a
heavy load. During this adaptive shift controls process,
some shifts may feel different as the transmission
determines optimum settings for a particular shift.
®
uses a shift stabilization
®
also uses adaptive shift
®
constantly makes