1993 GMC SIERRA differential

Senrice d& Appearance Cam
Front Axle
When to Check and Change Lubricant:
Refer to the Maintenance Sched,ule to determine
lubricant and when to change it. See “Scheduled
the Index.
How to Check Lubricant:
how often to check the Maintenance Services” in
PO231
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
(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.
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23. EXHAUST PRESSURE REGULATOR VALVE INSPECTION* -Check that
the valve works properly. Correct any binding. Inspect hoses fo\
r cracks, chafing or decay. Replace parts as needed.
24.
TIRE AND WHEEL ROTATION AND INSPECTION -For proper wear
and maximum tire life, rotate tires at the first
6,000 miles (1 0 000
kilometers) for Schedule I (t) or 7,500 miles (12 500 kilometers) for
Schedule
II (.) and then every 15,000 miles (25 000 kilometers)
thereafter. Follow the instructions and patterns shown in Section 6.
Check tires for uneven wear or damage.
If irregular or premature wear is
apparent, check wheel alignment. Also, check for damaged wheels.\
See
“Tires” in the Index for more information.
For dual wheels, whenever the vehicle, wheels, or fasteners are new,
have the wheel fastener torque set at the first 100,
1,000 and 6,000
miles (160, 1600 and 10
000 km).
For 3500 H.D. Models, block the tires opposite those being removed to
keep the vehicle from rolling.
25.
DRIVE AXLE SERVICE -Check readfront axle fluid level and add as
needed. Check constant velocity joints and axle seals for leaki\
ng.
Locking differential-Drain fluid at first oil change and refill. Check
fluid level and add as needed at subsequent oil changes.
In dusty
areas, or trailer towing applications drain fluid at every 15,0\
00 miles
(24 135 kilometers) and refill$
every oil change. In dusty areas, or trailer towing applications, drain
fluid every 15,000 miles
(24 135 kilometers) and refi1l.t
More frequent lubrication may be required on heavy-duty or off-road
use.
Standard differential -Check fluid level and add as needed at
26.
BRAKE SYSTEM INSPECTION -When the engine oil is changed,
inspect the lines and hoses for proper hookup, binding, leaks, \
cracks,
chafing, etc. Check the parking brake adjustment, and the fluid level in
the master cylinder.
A low fluid level can indicate worn disc brake pads
which may need to be sewiced.t
*An Emission Control Service
tA fluid
loss in these systems may indicate a problem. Have them
inspected and repaired at once.
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Recommended Fluids & Lubricants
NOTE: Fluids and lubricants identified below by name, part number or
specification may be obtained from your
GM Dealer.
USAGE I FLUID/LUBRICANT
Engine Oil
I
GM Goodwrench Motor Oil or equivalent for API Service SG
or SGlCE of the recommended viscositv.
Engine Coolant Mixture
of water and a good quality ethylene glycol base
antifreeze conforming
to GM-6038-M (GM Part No. 1052103).
Hydraulic Clutch System Hydraulic Clutch Fluid (GM Part
No. 12345347 or equivalent).
Hydraulic Brake Systems Delco Supreme
11
@ brake fluid (GM Part No. 1052535 or
DOT-3).
Parking Brake Cables
GM Lubricant (GM Part
No. 1052182) or equivalent.
Manual Steering Gear GM Power Steering
Fluid (GM Part
No. 1050017) or
Power Steering System Chassis grease meeting requirements of
NLGl Grade 2,
Automatic Transmission DEXRONB
HE Automatic Transmission Fluid (GM Part
No.
Catagory LB or GC-LB (GM Part No. 1052497).
equivalent conforming
to GM spec 9985010.
1051
855l.
Manual Transmission:
a. 5-Speed with Low Gear
b. Standard Transmission Fluid (GM Part
No. 12345349).
b. 5-Speed without Low Gear a.
CastrolB Syntorq or equivalent (GM Part
No.
1 2346074).
Differential:
a. Standard (Saginaw) Front
b. SAE-80W-90 gear lubricant (GM Part No. 1052271). b. Locking a.
SAE-80W-90 gear lubricant (GM Part
No. 1052271).
and Rear Axle
Transfer Case Gas Line De-lcer (GM Part
No. 1051516).
Gas Line DexronB
IIE Automatic Transmission
Fluid (GM Part No.
12345881).
Weather Strips
Category LB or GC-LB (GM Part
No. 1052497).
Chassis grease meeting requirements
of NLGl
Grade 2,
Clutch Fork Ball Stud Category
LB or GC-LB (GM Part
No. 1052497).
Shift Lever, and Propeller Shaft. Chassis grease meeting requirements
of NLGl Grade 2,
Column Shift, Transfer Case Spray-A-Squeek
(GM Part
No. 1052277).
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