Chevrolet 2011 Suburban User Manual download pdf (Page 319)

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Chevrolet Tahoe/Suburban Owner Manual - 2011

Driving and Operating 9-39

The 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 is 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 could appear to

be a delayed shift, however the

transmission is operating normally.

The vehicle's transmission uses

adaptive shift controls. Adaptive

shift controls continually 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 the

temperature changes. During this

adaptive shift control process,

shifting might feel different as the

transmission determines the best

settings.

When temperatures are very cold,

shifting could be delayed providing

more stable shifts until the engine

warms up. Shifts could be more

noticeable with a cold transmission.

This difference in shifting is normal.

M (Manual Mode): This position

lets drivers select the range of gears

appropriate for current driving

conditions. If the vehicle has this

feature, see “Range Selection

Mode” under Manual Mode on

page 9‑40.

3 (Third): This position is also used

for normal driving. It reduces vehicle

speed more than D (Drive) without

using the brakes. You might choose

3 (Third) instead of D (Drive) when

driving on hilly, winding roads, when

towing a trailer, so there is less

shifting between gears and when

going down a steep hill.

2 (Second): This position reduces

vehicle speed even more than

3 (Third) without using the brakes.

You can use 2 (Second) on hills.

It can help control vehicle speed as

you go down steep mountain roads,

but then you would also want to use

the brakes off and on.

If you manually select 2 (Second) in

an automatic transmission, the

transmission will start in

second gear. You can use this

feature for reducing the speed of the

rear wheels when you are trying to

start the vehicle from a stop on

slippery road surfaces.

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