Page 305 of 436

If the differential is at operating temperature (warm),
add enough lubricant to raise the level to the bottom of
the filler plug hole.
If the differential is cold, add enough lubricant to raise
the level to 1/2 inch (12 mm) below 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.
Engine Coolant
The cooling system in your vehicle is filled with
new DEX-COOL@ engine coolant. This coolant is
designed to remain in your vehicle for
5 years or
150,000 miles (240
000 km), whichever occurs first,
if
you add only DEX-COOL@ extended life coolant.
The following explains your cooling system and how to
add coolant when
it is low. If you have a problem with
engine overheating, see “Engine Overheating” in
the Index.
A 50/50 mixture of water and the proper coolant for
your vehicle will:
0 Give freezing protection down to -34°F (-37°C).
0 Give boiling protection up to 265 “F (1 29°C).
Protect against rust and corrosion.
Help keep the proper engine temperature.
0 Let the warning gages work as they should.
NOTICE:
When adding coolant, it is important that you use
only
DEX-COOL@(silicate-free) coolant.
If coolant other than DEX-COOL@ is added to
the system, premature engine, heater core or
radiator corrosion may result. In addition, the
engine coolant will require change sooner
-- at
30,000 miles (50 000 km) or 24 months,
whichever occurs first. Damage caused by the use
of coolant other than DEX-COOL@ is not
covered by your new vehicle warranty.
ProCarManuals.com
Page 362 of 436

Short TripKity Maintenance Schedule -- Gasoline Engines
** Drive axle service (see “Recommended Fluids and
Lubricants”
in the Index for proper lubricant to use):
0
e
0
0
Locking Differential -- Drain fluid and refill at first
engine oil change. At subsequent oil changes, check
fluid level and add fluid as needed. If driving in
dusty areas
or towing a trailer, drain fluid and refill
every 15,000 miles
(25 000 km).
Standard Differential -- Check fluid level and add
fluid
as needed at every oil change. If driving in
dusty areas or towing a trailer, drain fluid and refill
every
15,000 miles (25 000 km).
More frequent lubrication may be required for
heavy-duty
or off-road use.
3500 HD Models with applications requiring extreme
overloadtrailer towing conditions and high-speed (above
45 mph or 70 km/h) conditions for extended
periods of time must have the drive axle fluid changed every
30,000 miles (50 OOO km). See “Recommended
Fluids and Lubricants” in this section.
3,000 Miles (5 000 km)
0 Change engine oil and filter (or every
3 months, whichever occurs first).
An Emission Control Service.
0 Lubricate chassis components (or every
3 months, whichever occurs first).
(See footnote
#.)
0 Check readfront axle fluid level and add
fluid as needed. Check constant velocity
joints and axle seals for leaking.
(See footnote **.)
DATE ACTUAL MILEAGE SERVICED BY:
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Page 385 of 436

Long Tripmighway Maintenance Schedule -- Gasdin-
The services shown in this schedule up to 100,000 miles
( 166 000 km) should be performed after 100,000 miles
(166
000 km) at the same intervals. The services shown
at
150,000 miles (240 000 km) should be performed at
the same interval after 150,000 miles (240
000 km).
See “Owner Checks and Services” and “Periodic
Maintenance Inspections’’ following.
Footnotes
The U.S. Environmental Protection Agency or the
California
Air Resources Board has determined that the
failure to perform this maintenance item will not nullify
the emission warranty or limit recall liability prior to the
completion
of the vehicle’s useful life. We, however, urge
that
all recommended maintenance services be performed
at the indicated intervals and the maintenance be recorded.
# Lubricate the front suspension, kingpin bushings,
steering linkage, transmission shift linkage, transfer case
shift linkage, parking brake cable guides, rear driveline
center splines, front axle propshaft splines and brake
pedal springs. Ball joints and kingpin bushings should
not be lubricated unless their temperature is 10 OF
(- 12°C) or higher, or they could be damaged.
+ A good time to check your brakes is during tire
rotation. See “Brake System Inspection” under “Periodic
Maintenance Inspections” in Part
C of this schedule.
** Drive axle service (see “Recommended Fluids and
Lubricants”
in the Index for proper lubricant to use):
0
0
0
Locking Differential -- Drain fluid and refill at first
engine oil change. At subsequent oil changes, check
fluid level and add fluid as needed.
Standard Differential
-- Check fluid level and add
fluid as needed at every engine oil change.
3500 HD Models with applications requiring
high-speed (above
45 mph or 70 kmh) operation for
extended periods of time must have the drive axle
fluid changed every
30,000 miles (50 000 km).
7-31
ProCarManuals.com
Page 406 of 436

USAGE
Manual
Transmission (5-Speed without
Low Gear,
RPO MG5)
Automatic
Transmission
Key Lock
Cylinders
Floor Shift
Linkage
Chassis
Lubrication
FLUIDLUBRICANT
~~
Synchromesh Transmission Fluid
(GM Part
No. 12345349
or equivalent).
DEXRON@-111 Automatic
Transmission Fluid.
Multi-Purpose lubricant, Superlube@ (GM Part
No. 12346241
or equivalent).
Lubriplate lubricant aerosol (GM
Part No. 12346293 or
equivalent) or lubricant meeting
requirements of NLGI
## 2
Categorv LB or GC-LB, ~~~
Chassis lubricant (GM Part
No. 1052497 or equivalent) or
lubricant meeting requirements
of NLGI # 2, Category LB
or GC-LB.
USAGE
Front Wheel
Bearings
Differential,
Front and Rear
Axle
Differential,
C3 (HD3500)
Trucks With
Dana Rear Axle
Transfer Case
Windshield Washer Solvent
Propeller Shaft SplineLJniversal
Joint and
Propeller Shaft
FLUIDLUBRICANT
Wheel bearing lubricant meeting
requirements
of NLGI # 2,
Category GC
or GC-LB (GM Part
No. 105 1344 or equivalent).
Axle Lubricant (GM Part
No. 105227 1) or SAE SOW-90
GL-5 Gear Lubricant.
SAE 75W- 140 Synthetic Gear
Lubricant
(GM Part
No. 12346 140) or equivalent.
DEXR0N'-111 Automatic
Transmission Fluid.
~~
GM Optikleen' Washer Solvent
(GM
Part No. 105 15 15)
or equivalent.
Chassis lubricant (GM Part
No. 1052497 or equivalent) or
lubricant meeting requirements
of
NLGI ## 2, Category LB
or GC-LB.
7-52
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