Automatic Transmission Third-Gear Hold; Manual Transmission Operation - GMC T-Series 2007 Owner's Manual

See Instrument Panel Overview on page 100 for
more information.
Press the button to turn on the overdrive defeat.
Press the button again to turn off the overdrive
defeat. The indicator light in the button will come
on whenever overdrive defeat is active.
Automatic Transmission
Third-Gear Hold
If your vehicle has this feature, your range
selector has a 2-3 position. You cannot shift up
to the next higher gear when the transmission is in
this position unless your engine-governed speed
is exceeded, such as when going downhill.
The overdrive defeat
button is located in the
instrument panel to
the right of the steering
column.
This feature is used for certain load and traffic
conditions or when plowing snow. See the Allison
Transmission Operator's Manual in your vehicle
for more information about this.

Manual Transmission Operation

Using the Clutch
When you are starting to move the vehicle, it is
important to begin with the engine speed at idle.
Then start to engage the clutch and listen for an
engine speed drop of about 100 rpm. At this point,
the clutch is engaging, so you should increase the
engine speed and fully engage the clutch.
Notice: If you increase the engine speed
before the clutch is fully engaged, you could
damage your transmission. Always allow
the clutch to fully engage before increasing
engine speed.
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