Page 243 of 372

How to Add Fluid Rear Axle
Refer to the Maintenance Schedule to determine what
kind of transmission fluid to use. See “Recommended
Fluids and Lubricants”
in the Index.
Add
tluid only after checking the transmission fluid
HOT. (A COLD check is used only as a reference.) If
the fluid level is low, add only enough of the proper
fluid to bring
the level up to the HOT area for a hot
check.
It doesn’t take much fluid, generally less than a
pint (0.5 L). DOLJ ’t overfill. We recommend you use only
fluid labeled DEXRON@-111, because fluid with that
label is made especially for your automatic transmission.
Damage caused by
fluid other than DEXRON-111 is not
covered by your new vehicle warranty.
After adding fluid, recheck the fluid level as
described under ”How to Check.”
When the correct fluid level is obtained, push the
dipstick back
in all the way; then flip the handle
down to lock
the dipstick in place.
When to Check and Change Lubricant
Refer to the Maintenance Schedule to determine how
often to check the lubricant and when to change
it. See
“Scheduled Maintenance Services” in the Index.
How to Check Lubricant
If the level is below the
bottom of the filler plug
hole,
you’ll need to add
some lubricant. Add
enough lubricant to raise
the level
to the bottom of
the filler plug hole.
What to Use
Refer to the Maintenance Schedule to determine what
kind
of lubricant to use. See “Recommended Fluids and
Lubricants”
in the Index.
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Page 270 of 372

A CAUTION:
Mixing tires could cause you to lose control while
driving.
If you mix tires of different sizes or types
(radial and bias-belted tires), the vehicle may not
handle properly, and
you could have a crash.
Using tires of different sizes may also cause
damage to your vehicle. Be sure to use the same
size and type tires
on all wheels.
Uniform Tire Quality Grading
The following information relates to the system
developed by the United States National Highway
Traffic Safety Administration, which grades tires
by
treadwear, traction and temperature performance. (This
applies only to vehicles sold
in the United States.) The
grades are molded
on the sidewalls of most passenger
car tires. The Uniform Tire Quality Grading system does
not apply
to deep tread, winter-type snow tires,
space-saver or temporary use spare tires, tires with
nominal
rim diameters of 10 to 12 inches (25 to 30 cm),
or to some limited-production tires.
While the tires available on General Motors passenger
cars and light trucks may vary with respect
to these
grades, they must
also conform to Federal safety
requirements and additional General Motors Tire
Performance Criteria
(TYC) standards.
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Page 271 of 372

Treadwear Temperature -- A, B, C
The treadwear grade is a comparative rating
based on
the wear rate of the tire when tested under controlled
conditions
on a specified government test course. For
example, a tire graded 150 would wear one and a half
(1 1/2) times as well on the governrnent course as a tire
upon the actual conditions
of their use, however, and
may depart significantly from the norm due
to variations
in driving habits, service practices and differences in
road characteristics and climate.
b oraded 100. The relative performance of tires depends
Traction -- A, B, C
The traction grades, from highest to lowest, are A, B, and
C, and they represent the tire's ability to stop on wet
pavement as measured under controlled conditions on
specified government test surfaces of asphalt and concrete.
A tire marked C may have poor traction pelformance.
Warning: The traction grade assigned to
this tire is based
on braking (straightahead) traction tests and does not
include cornering (turning) traction. The temperature
grades are
A (the highest), B, and C,
representing the tire's resistance to the generation of
heat and its ability to dissipate heat when tested under
controlled conditions
on a specified indoor laboratory
test wheel. Sustained high temperature can cause the
material
of the tire to degenerate and reduce tire life, and
excessive temperature can lead
to sudden tire failure.
The grade
C corresponds to a level of performance
which all passenger car tires must meet under the
Federal Motor Vehicle Safety Standard
No. 109.
Grades B and A represent higher levels of performance
on the laboratory test wheel than the minimum required
by law.
Warning: The temperature grade for this tire
is
established for a tire that is properly inflated and not
overloaded. Excessive speed, underinflation, or
excessive loading, either separately or
in combination,
can ca~w heat. buildup and possible tire failure.
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Page 354 of 372
Roadside Assistance
n
Flat Tire Cl~~lngu: Installation of spare tire will be
covered at no charge (customer is responsible for repair
or replacement of tire).
Fuel Dcli\!ery: Delivery of enough fuel for the customer
to get to the nearest service station (up to
$4.00) will
be covered.
JLIIIZ~ Smt: No-start situations which require a battery
jump start
will be covered at no charge.
Lock Out: Replacement keys or locksmith service will
be covered at no charge if you are unable to gain entry
into your vehicle. Delivery of the replacement key
will
be covered at no charge within 10 miles (16 km).
Emergc~17cy 7bkr;ing Ser-vic~: Towing to the nearest
GMC Truck dealer for warranty related disablements
will be covered.
GMC Truck’s Roadside Assistance provides stranded
owners with over-the-phone roadside repairs, location
of the nearest GMC Truck dealer or the following
special services:
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