GMC 2003 Envoy - Manual (Page 95)

Four-Wheel Drive
li your vehicte iias four-vvh&el drive, you can send your
engine's driving power to ell (our wheels lor e>itra
traclion. To get the most saiisfaclion out of four-wheel
drive, you must be lamiliar with jls oporafion. Head
tha pan tha! follows before using lour-wtieei drive
Vou should use two-wheel drive hi-gh (2HI) for most
normal driving conditions-
Driving In the 4-WHEEL HIGH (4HI) nr
4'WHEEL LOW |4LOJ positions fof a tohg lime an
dry or wel pavemenl could shorten the life ot
your vehicEe^s drivetrain+
Automatic Transfer Case
If your vehicle is equipped
with Ihe auEomatic transfer
case, the transfer
iinob is located lo liie right
of the steering wheel on the
instrumenl panel. Use this
Knob to shift Into and out of
four-wheel drive.
2Hl (Two-Wheel High^ This setting is for drivrng in
most slieet and highway siluations. Vour front axle is not
engaged in two-wheel drive. il also provides the besi
fuel economy.
A4WD (Automatic Four-Wheel Drive): This selting is
ideal for use whor^ road conditions are variable
When driving your vehicle in A4WD, the (ronl axle is
engaged, but Iho vehicle’s power is sent le the
rear wheels. When the vehicle senses a loss o1 traclion,
Ehe system will automaiicnily engage four-wheel
drive. Driving in this mode resulls in slightly lower fuel
economy lhan 2Hl
4HI (Four-Wheel High): Use 4HI when you need extra
traclion, Eucli as on snowy or icy roads or Irt mosl
off-road situations. This selting also engages your front
axle
10 help drive your vehicle.
4L0 {Four-Wheel Low): This setling also engages
your from flxte and delivers exlra lorque. You may never
need 4L0. It sends mexlmunn power lo all tour wheels.
You might choose 4L0 if you are driving oft-road in
deep sand, deep mud. and clirnbing or descending
steep hills.
2-26