Chevrolet 2009 Suburban Owner's Manual page 142

1 (First): For the Hydra-Matic
this position reduces vehicle speed even more than
2 (Second) without using the brakes. You can use it
on very steep hills, or in deep snow or mud. If the shift
lever is put in 1 (First) while the vehicle is moving
forward, the transmission does not shift into first gear
until the vehicle is going slowly enough.
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For a Hydra-Matic 6-Speed transmission, this position
reduces vehicle speed without using the brakes.
You can use it for major/severe downgrades and
off-road driving where the vehicle would otherwise
accelerate due to steepness of grade. When you shift
to 1 (First) it provides the lowest gear appropriate to
the vehicle's current road speed and continues to
downshift as the vehicle slows, eventually downshifting
to 1 (First) gear.
Notice: 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.
2-36
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4-Speed transmission
Range Selection Mode (Hydra-Matic
6-Speed Transmission)
Base trim shown (uplevel similar)
The vehicle may have a Range Selection Mode.
The Range Selection Mode helps control the vehicle's
transmission and vehicle speed while driving down hill
or towing a trailer by letting you select a desired range of
gears.
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