1997 CHEVROLET SUBURBAN transmission

Making ’hms
NOTICE:
Making very sharp turns while trailering could
cause the trailer to come in contact with the
vehicle. Your vehicle could be damaged. Avoid
making very sharp turns while trailering.
When you’re turning with a trailer, make wider turns than
normal.
Do this so your trailer won’t strike soft shoulders,
curbs, road signs, trees or other objects. Avoid jerky or
sudden maneuvers. Signal well
in advance.
Turn Signals When Towing a Trailer
The arrows on your instrument panel will flash
whenever you signal a turn or lane change. Properly
hooked up, the trailer lamps will also flash, telling other
drivers you’re about to turn, change lanes or stop.
When towing a trailer, the arrows on your instrument
panel will flash for turns even
if the bulbs on the trailer
are burned out. Thus, you may think drivers behind you
are seeing your signal when they are not. It’s important
to check occasionally to be sure the trailer bulbs are
still working.
Driving On Grades
Reduce speed and shift to a lower gear before you start
down a long or steep downgrade. If you don’t shift
down, you might have
to use your brakes so much that
they would get hot and no longer work well.
On a long uphill grade, shift down and reduce your
speed to around
45 mph (70 kmh) to reduce the
possibility of engine and transmission overheating.
If you have an automatic transmission, you can tow
in
AUTOMATIC OVERDRIVE (0). You may want to
shift the transmission to THIRD
(3) or, if necessary, a
lower gear selection if the transmission shifts too often
(e.g., under heavy loads and/or hilly conditions).
When towing at high altitude on steep uphill grades,
consider the following: Engine coolant will boil at a
lower temperature than at normal altitudes. If you turn
your engine off immediately after towing at high altitude
on steep uphill grades, your vehicle may show signs
similar
to engine overheating. To avoid this, let the
engine run while parked (preferably on level ground)
with the automatic transmission in PARK
(P) for a few
minutes before turning the engine off. If you do get the
overheat warning, see “Engine Overheating” in
the Index.
4-52
ProCarManuals.com

When You Are Ready to Leave After
Parking
on a Hill
1. Apply your regular brakes and hold the pedal down
while you:
Start your engine;
0 Shift into a gear; and
0 Release the parking brake.
2. Let up on the brake pedal.
3. Drive slowly until the trailer is clear of the chocks.
4. Stop and have someone pick up and store the chocks.
Maintenance When Trailer Towing
Your vehicle will need service more often when you’re
pulling a trailer. See the Maintenance Schedule for more
on this. Things that are especially important in trailer
operation are automatic transmission fluid (don’t
overfill), engine oil, axle lubricant, belt, cooling system
and brake adjustment. Each
of these is covered in this
manual, and the Index will help you find them quickly.
If you’re trailering, it’s a good idea to review these
sections before you start your trip.
Check periodically to see that all hitch nuts and bolts
are tight.
Trailer Wiring Harness
A seven-wire harness is stored under the rear of your
vehicle, between the frame rails. An electrical connector
will need to be added at the trailer end
of the harness, by
a qualified electrical technician. For additional trailer
wiring and towing information, please consult your
dealer. Securely attach the harness to the trailer, then
tape or strap it to your vehicle’s frame rail. Be sure you
leave it loose enough
so the wiring won’t bind or break
when turning with the trailer, but not
so loose that it
drags on the ground. Store the harness in its original
position. Wrap the harness together and tie it neatly
so it
won’t be damaged. If you tow a trailer, your Center
High-Mounted Stoplamp (CHMSL) may not be
properly visible from behind. You should select a trailer
with a CHMSL
on it or, if one is not available, have one
installed. See your GM dealer about how to connect
your vehicle’s wiring to
a trailer CHMSL.
4-54
ProCarManuals.com

Power Winches
If you wish to use a power winch on your vehicle, only
use it when your vehicle is stationary or anchored.
NOTICE:
Using a power winch with the transmission in
gear may damage the transmission. When
operating a power winch, always leave the
transmission in
NEUTRAL (N).
Use the regular brakes, set the parking brake, or block
the wheels to keep your vehicle from rolling.
Power Take-Off (PTO)
I NOTICE:
If you have a PTO that will exceed 35 hp installed
on your vehicle, it could damage the transfer case
or transmission. When having a PTO installed on
your vehicle, make sure that it will not exceed
35 hp.
Before using a PTO, refer to the manufacturer’s or
installer’s instructions.
NOTICE:
Using a PTO while operating in one place before
the vehicle has reached normal operating
temperature can damage the transfer case or
transmission.
If you will be using the PTO while
operating in one place, drive and warm up the
vehicle before using the PTO.
4-55
ProCarManuals.com

To engage a PTO:
1. Turn the ignition off.
2. Set the parking brake.
3. Shift the transmission into NEUTRAL (N).
4. Engage the PTO.
NOTICE:
Using a PTO for more than four hours without
driving your vehicle
can damage the transfer case
or transmission.
If using a PTO for more than
four hours without driving your vehicle, drive
your vehicle for a while to allow the transfer case
and transmission to cool.
5. Start the vehicle. If you are going to drive the
vehicle, shift the transmission into the gear you
want. Then shift the transfer case into the range you
want (if you have four-wheel drive), apply the
regular brakes and release the parking brake.
Using a Transfer Case Mounted Power
Take-Off
1.
2.
3.
4.
5.
6.
7.
Set the parking brake.
Turn the ignition off.
Shift the transfer case into NEUTRAL
(N).
Shift the transmission into NEUTRAL (N).
Engage the PTO.
If you are going to drive the vehicle, shift the
transfer case into the range you want. Then apply the
regular brakes and release the parking brake.
Shift the transmission to THIRD
(3) to start the
Power Take-Off.
Release the regular brakes to drive the vehicle.
4-56
ProCarManuals.com

Other Warning Devices
If you carry reflective triangles, you can set one up at
the side of the road about
300 feet (100 m) behind
your vehicle.
Jump Starting
If your battery (or batteries) has run down, you may
want to
use another vehicle and some jumper cables to
start your vehicle. But please use the following steps to
do it safely.
Batteries can hurt you. They can be
dangerous because:
0 They contain acid that can burn you.
0 They contain gas that can explode or ignite.
0 They contain enough electricity to burn you.
If you don’t follow these steps exactly, some or all
of these things can hurt you.
NOTICE:
Ignoring these steps could result in costly damage
to your vehicle that wouldn’t be covered
by your
vehicle warranty.
Trying to start your vehicle by pushing
or pulling
it could damage your vehicle. With an automatic
transmission, it won’t start that
way.
1. Check the other vehicle. It must have a 12-volt
battery with a negative ground system.
2. Get the vehicles close enough
so the jumper cables
can reach, but be sure the vehicle’s aren’t touching
each other. If they are, it could cause a ground
connection you don’t want. You wouldn’t be able to
start your vehicle, and the bad grounding could
damage the electrical systems.
To avoid the possibility of the vehicles rolling, set the
parking brake
fiiy on both vehicles involved in the
jump
start procedure. Put an automatic transmission
in
PARK (P). If you have a four-wheel-drive vehicle,
be sure the transfer case is not
in NEUTRAL (N).
5-3
ProCarManuals.com

Towing Your Vehicle
Try to have your GM dealer or a professional towing
service tow your vehicle. See “Roadside Assistance” in
the Index. They can provide the right equipment and
know-how to tow it without damage.
If
your vehicle has been changed since it was
factory-new, by adding such things as
fog lamps, aero
skirting,
or special tires and wheels, these things could
be damaged during towing.
Before you
do anythmg, turn on the hazard warning flashers.
When you call, tell the towing service:
That your vehicle has rear-wheel drive, or that it has
The make, model and year of your vehicle.
Whether you can move the shift lever for the
If there was an accident, what was damaged.
the
four-wheel-drive option.
transmission and transfer case,
if you have one. When
the towing service arrives, let the tow operator
know that this manual contains these towing
instructions. The operator may want to see them.
To help avoid injury to you or others:
0 Never let passengers ride in a vehicle that is
0 Never tow faster than safe or posted speeds.
being
towed.
~ 0 Never tow with damaged parts not
’ 0 Never get under your vehicle after it has
~ been lifted by the tow truck.
fully
secured.
0 Always use separate safety chains on each
side when towing a vehicle.
ProCarManuals.com

Towing From the Front
A vehicle can fall from a car carrier if it isn’t
adequately secured. This can cause a collision,
serious personal injury and vehicle damage. The
vehicle should be tightly secured with chains or
steel cables before it is transported.
Don’t use substitutes (ropes, leather straps,
canvas webbing, etc.) that can be cut by sharp
edges underneath the towed vehicle.
Don’t have your vehicle towed on the drive wheels
unless you must. If the vehicle must be towed
on the
drive wheels, be sure to follow the speed and distance
restrictions later in this section or your transmission will
be damaged.
If these limitations must be exceeded, then
the drive wheels have to be supported on a dolly. If
your vehicle is four-wheel drive with a manual
transfer case, use the following directions:
1. Turn the ignition key to the off position.
2. Engage the parking brake.
3. Clamp the steering wheel in a straight-ahead
position with a clamping device designed for towing
service. (Do not use the vehicle’s steering column
lock for this.)
5-9
ProCarManuals.com

4. Put the transmission in PARK (P).
5. Put the transfer case in NEUTRAL (N).
6. When the vehicle is hooked up, release the
7. Maximum speed 55 mph (88 km/h),
If your vehicle is a two-wheel drive or a four-wheel
drive with an electric shift transfer case, use the
following directions:
1. Turn the ignition key to the OFF position.
2. Engage the parking brake.
3. Clamp the steering wheel in a straight-ahead
parking
brake.
distance unlimited.
position with a clamping device designed for towing
service.
(Do not use the vehicle’s steering column
lock for this.)
4. Put the transmission in NEUTRAL (N).
5. Put the transfer case in 2HIGH (2HI).
6. When the vehicle is hooked up, release the
7. Maximum speed 35 mph (55 km/h), maximum
parking
brake.
distance
50 miles (80 km).
Towing From the Rear
I 3
NOTICE:
If your vehicle is equipped with a manual or
electric shift transfer case, a towing dolly must be
used under the front wheels or vehicldpowertrain
damage will occur.
SI1 n
ProCarManuals.com