Driving and Operating 289
6-Speed Automatic Transmission
Gear before shifting from D
(Drive) to M (Manual Mode)
6th 5th 4th 3rd 2nd 1st
Range after shifting from D
(Drive) to M (Manual Mode)
M4 M4 M3 M2 M2 M1
8-Speed Automatic Transmission
Gear before shifting
from D (Drive) to M
(Manual Mode)
8th 7th 6th 5th 4th 3rd 2nd 1st
Range after shifting
from D (Drive) to
M (Manual Mode) –
Tow/Haul not
engaged
M6 M6 M5 M4 M3 M3 M2 M1
Range after shifting
from D (Drive) to
M (Manual Mode) –
Tow/Haul engaged
M6 M5 M4 M3 M3 M3 M2 M1
Grade Braking is not available when
Range Selection Mode is active.
See Tow/Haul Mode 0 290.
While using Range Selection Mode,
cruise control and the Tow/Haul
Mode can be used.
If the vehicle has an exhaust brake,
it can also be used, but will not
automatically downshift the
transmission. See “Exhaust Brake”
in the Duramax diesel supplement.
Caution
Spinning the tires or holding the
vehicle in one place on a hill
using only the accelerator pedal
may damage the transmission.
The repair will not be covered by
the vehicle warranty. If you are
stuck, do not spin the tires. When
stopping on a hill, use the brakes
to hold the vehicle in place.
Low Traction Mode
If equipped, Low Traction Mode
assists in vehicle acceleration when
road conditions are slippery, such
as with ice or snow. While the
vehicle is at a stop, select M2 using
Range Selection Mode. This will
limit torque to the wheels and help
to prevent the tires from spinning.
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