Four-Wheel Drive; Transfer Case); Drive Systems - Chevrolet 2012 Suburban Owner's Manual

When Tow/Haul Mode is selected
the tow/haul indicator light will come
on. See Tow/Haul Mode Light on
page 5 24.
The Tow/Haul Mode works with the
®
Autoride feature, if the vehicle has
this, to enhance the ride when
trailering or with a loaded vehicle.
See Continuous Damping Control
(CDC) on page 9 51.
Grade Braking (Hydra-Matic
6-Speed Automatic
Transmission)
The Grade Braking shift modes can
be activated by pressing the button
on the end of the shift control lever.
While in Range Selection Mode,
Grade Braking is deactivated
allowing the driver to select a
desired range of gears.
Grade Braking is only active while
the Tow/Haul Mode is selected and
you are not in the Range Selection
Mode. See Tow/Haul Mode listed
previously and Manual Mode on
page 9 35 for more information on
the Range Selection Mode. Grade
Braking assists in maintaining
desired vehicle speeds when driving
on downhill grades by automatically
implementing a shift schedule that
utilizes the engine and transmission
to slow the vehicle. This reduces
wear on the braking system and
increases control of the vehicle.
Grade Braking monitors vehicle
speed, acceleration, engine torque
and brake pedal usage. Using this
®
information, it detects when the
truck is on a downhill grade and the
driver desires to slow the vehicle by
pressing the brake.
Also see Towing Equipment on
page 9 79 for more information.
I n f o r ma t i o n P r o v i d e d b y :
Driving and Operating

Drive Systems

Four-Wheel Drive

(Two Speed Automatic

Transfer Case)

If the vehicle has four-wheel drive,
you can send the engine's driving
power to all four wheels for extra
traction. Read the following before
using four-wheel drive.
Notice: Driving on clean, dry
pavement in Four-Wheel Drive
High or Four-Wheel Drive Low for
an extended period of time may
cause premature wear on the
vehicle's powertrain. Do not drive
on clean, dry pavement in
Four-Wheel Drive High or
Four-Wheel Drive Low for
extended periods of time.
While driving on clean dry pavement
and during tight turns, you may
experience a vibration in the
steering system.
9-37