GMC 1999 Jimmy Owner's Manual page 90

Shift Light
This light will show you when to shift to the next higher
gear for best fuel economy.
When this light comes on, you can shift to the next
higher gear if weather, road and traffic conditions let
you. For the best fuel economy, accelerate slowly and
shift when the light comes on.
While you accelerate, it is normal for the light to go on
and off if you quickly change the position of the
accelerator. Ignore the SHIFT light when you downshift.
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If you have a manual
transmission, you have a
SHIFT light.
CAUTION:
If you skip more than one gear when you
downshift, you could lose control of your vehicle.
You could injure yourself or others. Don't shift
down more than one gear at a time when you
down shift.
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If your vehicle has four wheel drive and is equipped
with a manual transmission, disregard the SHIFT light
when the transfer case is in 4LO.
Four Wheel Drive (If Equipped)
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If your vehicle has four wheel drive, you can send your
engine's driving power to all four wheels for extra
traction. To get the most satisfaction out of four
drive, you must be familiar with its operation. Read the
part that follows before using four
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should use two wheel high (2HI) for most normal
driving conditions.
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wheel
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wheel drive. You