Page 276 of 404

Front Axle
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.
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 (1 2 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
TM (orange-colored, silicate-free) engine
coolant. This coolant is designed
to remain in your
vehicle for
5 years or 100,000 miles (1 66 000 km),
whichever occurs first.
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.
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Page 332 of 404

Short TripKity Maintenance Schedule -- Gasoline Engines
The services shown in this schedule up to 100,000 miles
(1 66 000 km) should be performed after 100,000 miles
(166 000 km) at the same intervals.
Footnotes
T 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°F
(- 12°C) or higher, or they
could be damaged.
:f: :1:
0
0
0
e
Drive axle service:
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
I5,OOO miles (25 000 km).
More frequent lubrication may be required for
heavy-duty or off-road
use.
3500 HD Models with applications requiring extreme
overload/trailer towing conditions and high-speed
(above
45 mph or 70 kmh) conditions for extended
periods
of time must have the drive axle fluid changed
evey
30,000 miles (50 000 km). See “Recommended
Fluids and Lubricants’’
in this section.
7-6
ProCarManuals.com
Page 355 of 404

Long Tripmighway Maintenance Schedule -- Gasoline Engines I
The services shown in this schedule up to 100,000 miles
(1 66 000 km) should be performed after 100,000 miles
(166 000 km) at the same intervals.
Footnotes
j- 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°F (- 12°C) or higher, or they
could be damaged.
‘k‘k Drive axle service:
a
e
e
a
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 engine 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 kmh) conditions for extended
periods
of time must have the drive axle fluid changed
every
30,000 miles (50 000 km). See ”Recommended
Fluids and Lubricants”
in this section.
I
ProCarManuals.com
Page 375 of 404

USAGE
Manual
Transmission (5-Speed
with
Low Gear, RPO
MW3)
Manual
Transmission
(5-Speed without
Low Gear, RPO
MG5)
Automatic
Transmission
Key Lock
Cylinders
Floor Shift
Linkage
FLUID/LUIBRICANT
GM Goodwrench Synthetic
Manual Transmission Gear Oil
(GM Part No. 12346 190
- 1 qt.),
Castrol Syntorq@
LT or equivalent
SAE 75W-90 GL-4 gear oil.
Synchromesh Transmission Fluid
(GM Part
No. 12345349 or
equivalent).
~~ ~~
DEXRON@-I11 Automatic
Transmission
Fluid.
Multi-Pu ose Lubricant,
Superlube
% (GM Part
No. 1234624
1 or equivalent),
Lubriplate Lubricant aerosol (GM
Part
No. 12346293 or equivalent)
or lubricant meeting requirements
of NLGI Grade 2 Category LB or
GC-LB.
I USAGE
Chassis
Lubrication
Front Wheel
Bearings
Differential,
Front and Rear
Axle
I
Differential, C3
(3500 HD)
Trucks With
Dana Rear Axle
I Transfer Case
FLUID/LUBRICANT
Chassis lubricant (GM Part
No. 1052497 or equivalent) or
lubricant meeting requirements of
NLGI Grade
2, Category LB or
Wheel bearing lubricant meeting
requirements of NLGI Grade 2,
Category GC or GC-LB (GM Part
No. 105 1344 or equivalent).
Axle Lubricant
(GM Part
No. 105227 1) or SAE 80W-90
GL-5 Gear Lubricant.
SAE 75W-
I40 Synthetic Gear
Lubricant. GC-LB.
~~
DEXRON@-I11
Automatic
Transmission Fluid.
~~ ~ ~ -~ -
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ProCarManuals.com