24. DRIVE AXLE SERVICE? - Check readfront axle fluid level and
add
as needed. Check constant velocity joints and axle seals for
leaking.
0
0
0
0
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
15,000 miles (24 135 kilometers) and refill.
Standard differential - Check fluid level and add as needed at
every
oil change. In dusty areas, or trailer towing applications,
drain fluid every
15,000 miles (24 I35 kilometers) and refill.
More frequent lubrication may be required on heavy-duty or
off-road use.
3500 HD Models - 3500 HD Models with applications requiring
extreme overload/trdiler tow conditions
and high speed conditions
(above 45 mph (72
kdh)) for extended periods of time must
change drive axle fluid every
3,000 miles (4828 kilometers) or 3
months, whichever comes first, OR must use 75W-140 synthetic
fluid meeting
GM specifications. See “Recommended Fluids and
Lubricants” at the end of this section for the proper fluid to use.
25.
BRAKE SYSTEM INSPECTION-f - When the engine oil is
changed, inspect the lines and hoses for proper hookup, binding, leaks,
cracks, chafing, etc. Check the parking brake adjust, and the fluid level
in the master cylinder. A low fluid level can indicate worn disc brake
pads which may need
to be serviced.
When the wheels are removed for rotation, inspect disc brake pads for
wear and rotors for surfxe condition. Also inspect drum brake linings
for wear and cracks. Inspect other brake parts, including drums, wheel
cylinders, parking brake, etc., at the same time. Remove any
rust or dirt
from the wheel and mounting surfaces before mounting the wheel.
Inspect brakes more often if driving habits or conditions result in
frequent braking.
?A fluid loss in these systems may indicate a problem. Have them
inspected and repaired at once.
7-22
ProCarManuals.com
What You’// Find in the Index;
A list of all PSP’s published by GMC Truck in a model year. PSP’s
covering all models of GMC light trucks are listed in the same index.
Ordering information so you can buy the specific PSP’s you may want.
Price information for the PSP’s you may want to buy.
How You Can Get an Index:
Indexes are published periodically. Most of the PSP’s which could
potentially apply to the most recent GMC Truck models will be listed
in the
most recent publication for that model year. This means you may want
to
wait until the end of the model year before ordering an index, if you are
interested
in buying PSP’s pertaining to a current model year car or truck.
Some
PSP’s pertaining to a particular model year vehicle may be published in
later years, and these would be listed in the later year’s index. When you order
an index for a model year that is not over
yet, we’ll send you the most recently
published issue. Check the ordering form
for indexes for earlier model years.
Cut out the ordering form,
fill it out, and mail it in. We will then see to it
that an index is mailed to you. There is no charge for indexes for the
1939-1 994 model years.
Toll-Free Telephone Number
If you want an additional ordering form for an index or a subscription, just
call toll-free and we’ll be happy to send you one. Automated recording
equipment will take your name and mailing address. The number to call is
1-800-551-4123.
Copies at Participating Dealers
Copies of Indexes and individual PSP’s are at your participating GMC
Truck dealer.
You can ask to see them.
A Very lmportant Reminder
These PSP’s are meant for technicians. They are not meant for the
“do-it-yourselfer”. Technicians have the equipment, tools, safety
instructions, and know-how
to do a job quickly and safely.
GMC Truck reserves
the right to change these procedures without notice
after November, 1992.
GMC Truck Service Publications
You can get these Product Service Publications by using the order form. You
can also get Service Manuals and Owner Publications.
8-8
ProCarManuals.com
M
Maintenance OtherItems
.................................................. 6-49
Periodic Inspections
........................................... 7-24
Record
...................................................... 7-27
Scheduled Maintenance
.................................... 7.3. 7.18
When Towing
a Trailer ......................................... 4-44
Convexoutside ............................................... 2-55
Electric Outside
............................................... 2-54
Inside
....................................................... 2-54
Outside
..................................................... 2-54
Vanity
...................................................... 2-56
ModelReference
.................................................. 111
Underbody .................................................. 6-87
Master Cylinder (See “Brakes”) Mirrors
........................................................ 2-54
...
0
Odometer ...................................................... 2-68
Off-Road Driving (See “Driving”)
Off-RoadRecovery
.............................................. 4-10
Oil (Except Diesel) ............................................... 6-17
Additives
.................................................... 6-23
DisposalofUsed
.............................................. 6-28
Pressure Gage
................................................ 2-80
To(3lheck
.................................................... 6-18
WhatKindtoUse
............................................. 6-19
WhentoAdd
................................................. 6-18
Whentochange
.............................................. 6-28
Oil(Diese1)
..................................................... 6-24
Additives
.................................................... 6-28
DisposalofUsed
.............................................. 6-28
ToCheck
.................................................... 6-25
WhatKindtoUse
............................................. 6-26
WhentoAdd
................................................. 6-28
Whentochange
.............................................. 6-28
Owner Checks and Services ........................................ 7-22
Parking OnHills
..................................................... 4-43
Over Things That
Burn ......................................... 2-32
Torque Lock (Automatic Transmission)
............................ 2-29
Your Vehicle (Manual Transmission)
.............................. 2-32
Passing Other Vehicles
....................................... 4-10. 4-60
Periodic Maintenance Inspections
................................... 7-24
ParkingBrake
................................................... 2-28
7
ProCarManuals.com
