Manual Transmission Operation - GMC C-Series 2001 Owner's Manual

Automatic Transmission Third Gear Hold
(If Equipped)
If your vehicle is equipped with this feature, your range
-
selector has a "2 3" position. You can't shift up to the
next higher gear when the transmission is in this
position unless your engine
such as when going downhill.
This feature is used for certain load and traffic
conditions or when plowing snow. See the Allison
Automatic Transmission Operator's Manual in your
vehicle for further information.

Manual Transmission Operation

Using the Clutch
When you're starting to move the vehicle, it's 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. It's important not to increase the engine
speed sooner or before the clutch begins its engagement.
If you do, you can cause damage to your vehicle.
-
governed speed is exceeded,
Double-Clutching
You must use the "double
shift an unsynchronized gear set. Disengage the clutch,
shift to NEUTRAL and engage the clutch. When
upshifting, slow the engine until the engine rpm and
road speed match. When downshifting, accelerate the
engine until the engine rpm and road speed match. Then
quickly disengage the clutch and move the shift lever to
the next gear position and engage the clutch.
Eaton Fuller 5 and 6-Speed Transmissions
and TTC Spicer 7-Speed Transmissions
These transmissions have gears that automatically
synchronize when you shift up or down (except
FIRST (1) gear on the five
transmission which is unsynchronized). Choose the gear
which will maintain the road speed you want while
keeping the engine above two
speed. When the engine speed drops below two
the governed speed, shift into the next lower gear before
your engine begins to lug. When you shift down, be sure
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to double clutch if required.
-
clutching" method when you
- -
speed and seven speed
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thirds of the governed
-
thirds of
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