
Brake  Adjustment 
Every time you make a brake  stop,  your  disc brakes  adjust for wear. 
If  your  brake  pedal  goes  down  farther  than normal, your rear drum brakes 
may need  adjustment.  Adjust them  by backing 
up and firmly  applying the 
brakes 
a few  times. 
Replacing Brake System  Parts 
The  braking  system  on a modeffl VEShicle is complex.  Its many parts have to 
be  of top quality  and work well  together if the  vehicle 
is to have really good 
braking.  Vehicles  we design  and test  have  top-quality 
GM brake parts in 
them, as your vehicle  does when it is new.  When  you replace  parts of your 
braking  system 
- for  example,  when your brake linings wear down and 
you  have  to have  new ones  put 
in - be sure  you get new  genuine GM 
replacement  parts. If you don't,  your brakes  may  no longer work properly. 
For example,  if someone  puts in brake  linings  that are wrong  for your 
vehicle, the  balance between  your  front and rear brakes can  change 
- for 
the worse.  The braking  performance  you've  come  to expect  can change 
in 
many  other ways  if someone  puts in the wrong  replacement  brake parts. 
Front Shock Absorbers 
The  front  shock  absorbers of your vehicle do many  things. They help the 
vehicle ride smoothly and 
also control the travel of the  suspension  system. 
When  the shock  absorbers  are  serviced,  any replacement  shock absorbers 
must  be the  same  as the  original  equipment shock absorbers 
in both 
extended  length and  strength. 
I NOTICE: 
If you  use  shock  absorbers  that  are  not  the  same  as the  original 
shock  absorbers,  the  shock  absorbers 
or suspension  system 
could  be  damaged. 
6-45 
ProCarManuals.com 

Fuse Block 
The fuse block access 
door  is on the  driver’s 
side  edge 
of the 
instrument panel. 
Pull 
off  the  cover  to access 
the fuse block. 
You can  remove  fuses 
with  a fuse extractor. 
The  fuse  extractor  is 
mounted to the  fuse 
block access door. 
To remove  fuses  if  you don’t have  a  fuse extractor, hold the end  of the  fuse 
between  your thumb and index  finger and pull straight out. 
Be  sure  to  use  the correct fuse. If  you  ever have  a problem 
on the  road  and 
don’t have  a  spare  fuse,  you can “borrow”  one 
of the correct  value. Just pick 
some  feature  of your  vehicle that 
you can get along  without-like  the  radio 
or  cigarette  lighter-and  use  its fuse,  if 
it is of the value you need. Replace 
it  as  soon  as  you can.  See “Fuses and Circuit Breakers”  in  the Tndex  for 
more  information. 
Specification Charts 
Replacement  Parts 
Replacement  part numbers listed in this section are based on the latest 
information  available at the  time 
of printing,  and  are subject to  change. If a 
part listed in this manual  is not the same  as the part used in your vehicle 
when  it was built, 
or if  you  have any questions,  please contact your GM 
truck dealer. 
These  specifications  are  for  information 
only. If you have any questions,  see 
the  service  manual  for the  chassis  or refer 
to the body manufacturer’s 
publications. 
6-80 
ProCarManuals.com 

Every 50,000 Miles (83 000 km) 
Automatic Transmission Service 
Every 60,000 Miles (100 000 km) 
Crankcase Depression Regulator  Valve (CDRV)  System Inspection 
Engine  Accessory  Drive Belt Inspection 
Exhaust  Gas Recirculation  (EGR) System Inspection 
(if equipped) 
Exhaust Pressure Regulator  Valve Inspection 
Maintenance  Schedule I - Gasoline  Engines  With 
Light 
Duty Emissions 
The services  shown in this  schedule up to 60,000 miles (1 00 000 km)  should 
be  performed  after 
60,000 miles (100 000 km) at the  same  intervals. 
Footnotes 
3 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 vehicle useful life.  We, 
however,  urge that all recommended  maintenance services  be performed at 
the indicated  intervals and the maintenance  be recorded. 
:$* 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). 
0 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 overload/trailer 
towing  conditions  and high  speed (above 
45 mph or 72 kmh) 
conditions  for extended  periods of time must have the  drive  axle fluid 
changed  every 
3,000 miles (5 000 km) or 3 months, whichever  occurs 
first,  or must  use 
75W-140 synthetic fluid meeting GM specifications. 
See  “Recommended Fluids and Lubricants” 
in this  section. 
7-12 
ProCarManuals.com 

Maintenance  Schedule I - Gasoline Engines  With 
Light  Duty  Emissions 
27,000 Miles (45 000 km) 
a Change  engine  oil and  filter  (or  every 3 months. whichever  occurs 
first). 
Arz Enzissiorz Control Service. 
0 Lubricate  the front  suspension,  king pin bushings,  steering linkage, 
transmission  shift linkage, transfer  case shift linkage. parking brake 
cable  guides,  rear driveline center  splines,  front axle propshaft  splines. 
brake  pedal springs and clutch  pe,dal springs. 
Ball joints  and king  pin 
bushings  should  not  be lubricated unless their temperature  is 
10" F 
(-12" C), or higher. When weather is  cold, let the ball  joints and king 
pin  bushings  warm up before lubrication  or they could  be damaged. 
Perform each  of the listed lubrication  service items  at this mileage 
interval (,or every 
6 months. whichever  occurs  first). 
Ll Check  readfront  axle  fluid level  and  add  fluid as needed. Check 
constant  velocity joints and axle  seals  for leaking.:!::': 
30,000 Miles (50 000 km) 
CI Change  engine  oil and filter  (or  every 3 months, whichever occurs 
first). 
An Euzission Corltrol Service. 
0 Lubricate  the front  suspension,  king pin bushings,  steering linkage, 
transmission  shift linkage, transfer case shift  linkage, parking brake 
cable  guides,  rear driveline center splines,  front  axle propshaft splines, 
brake  pedal springs  and clutch pedal  springs.  Ball joints  and king pin 
bushings should not  be lubricated unless their temperature  is 
10" F 
(-12" C), or higher.  When weather  is cold,  let the  ball  joints  and king 
pin  bushings  warm 
up before  lubrication  or they  could  be damaged. 
Perform each 
of the listed lubrication service items  at this mileage 
interval  (or every 
4 months. whichever  occurs  first). 
Check  readfront axle fluid level and add fluid as needed. Check 
constant  velocity joints and axle seals  for leaking.'+:+ 
(Contimed) 
7-18 
ProCarManuals.com 

LI 
c 
Maintenance Schedule I - Gasoline  Engines  With 
Light  Duty  Emissions 
(Contimed) 
Drain, flush  and refill  cooling  system (or every 24 months, whichever 
occurs  first).  See  "Engine  Coolant'' 
in the lndex  for what to use. 
Inspect hoses. Clean radiator. condenser. pressure  cap and  neck. 
Pressure  test 
the cooling system and pressure  cap. An Emission  Control 
Service. 
For 2-Wheel Drive vehicles  only: Clean  and repack  the front  wheel 
bearings  (or at each brake relining, whichever  occurs  first). 
Replace  spark plugs. 
An E~~zissior~ Corztrol Ser-vice. 
Replace  air cleaner filter.  Replace  filter more often under dusty 
conditions. 
An Emission Cor~tr-01 Service. 
Rotate tires.  See "Tire  Inspection  and Rotation" in the lndex for proper 
rotation pattern  and additional information. 
I DATE I ACTUAL MILEAGE I SERVICED BY: 
33,000 Miles (55 000 km) 
0 Change  engine  oil and  filter  (or every 3 months, whichever  occurs 
first). 
An Er7rissiou Contmi Service. 
0 Lubricate  the front  suspension,  king pin bushings, steering  linkage, 
transmission  shift  linkage, transfer case shift linkage,  parking brake 
cable  guides,  rear driveline  center  splines,  front  axle propshaft  splines, 
brake pedal  springs  and clutch pedal  springs. 
Ball joints  and king  pin 
bushings  should  not  be lubricated  unless their temperature  is 
10" F 
(-I 2" C), or higher.  When  weather is cold, let  the ball joints  and king 
pin bushings  warm up before lubrication  or they could be damaged. 
Perform 
each of the listed lubrication  service items  at this mileage 
interval  (or every 
6 months,  whichever  occurs  first). 
ProCarManuals.com 

Maintenance  Schedule II - Gasoline Engines With 
Light  Duty  Emissions 
The  services  shown in this schedule up to 60.000 miles ( 100 000 km)  should 
be  performed  after 
60.000 miles ( 100 000 km) at the same  intervals. 
Footnotes 
-i- 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 vehicle  useful  life. We, 
however.  urge  that  all  recommended  maintenance  services  be performed at 
the  indicated  intsrkrds 
and t!w rnlrinlcn;nnx be recor-ded. 
0 
0 
0 
0 
Locking Differential - Drain iluid mci wi.il! :ii !.iI-st cngine oii 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 tluid  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 overload/trailer 
towing  conditions  and  high speed  (above 
45 mph or 72 km/h) 
conditions  for  extended  periods 
of time must have the drive axle fluid 
changed  every 
3,000 miles (5 000 km) or 3 months, whichever  occurs 
first,  or  must  use  7SW-140  synthetic tluid  meeting 
GM specifications. 
See  "Recommended  Fluids and  Lubricants" 
in this section. 
7,500 Miles (12 500 km) 
0 Change  engine oil and filter  (or  every 12 months. whichever  occurs 
first). 
A11 E1?7iLs.~io1I Corlti-ol Serl7ic-e. 
Lubricate  the front  suspension,  king  pin  bushings.  steering linkage, 
transmission  shift linkage, transfer  case  shift linkage. parking brake 
cable  guides. 
rear driveline  center splines, front axle propshaft  splines, 
brake  pedal  springs and clutch  pedal springs. 
Ball joints  and  king  pin 
bushings  should 
not be  lubricated  unless their temperature is 10" F 
(-12" C). or higher.  When  weather  is cold,  let  the  ball  joints and king 
pin  bushings  warm  up before lubrication  or they  could  be damaged. 
Perform  each of  the  listed lubrication  service items  at  this mileage 
interval  (or every 
12 months.  whichever  occurs  first). 
(ColltillltL'd) 
7-27 
ProCarManuals.com 

I 
Maintenance  Schedule II - Gasoline  Engines  With 
Light  Duty  Emissions 
0 Replace spark plugs. At1 Emission  Control  Senlice. 
0 Inspect spark plug wires. Ai7 Emission Control  Service. ; 
0 Replace  air  cleaner filter. An E~~zission Control Sunice. 
- 
r! Inspect fuel tank, cap and lines for  damage or leaks. Inspect fuel  cap 
gasket  for  any  damage.  Replace parts 
as needed. An E~nission Control 
Service. ? 
DATE 
SERVICED BY: ACTUAL MILEAGE I 
< 
Maintenance  Schedule I - Gasoline  Engines  Heavy 
Duty  Emissions 
The  services  shown in this schedule  up to 60.000  miles ( 100 000 km)  should 
be  performed  after 
60.000 miles (100 000 km) at the same intervals. 
Footnotes 
*<: Drive  axle  service: 
a 
a 
0 
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 00 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 72 km/h) 
conditions  for  extended periods  of time must  have the drive  axle fluid 
changed every 
3,000 miles (5 000 km)  or 3 months, whichever occurs 
first,  or must  use 
75W-140 synthetic fluid meeting GM specifications. 
See  “Recommended  Fluids and Lubricants” 
in this section. 
7-34 
ProCarManuals.com 

Maintenance  Schedule I - Gasoline  Engines  Heavy 
Duty Emissions 
(Continued) 
L! If your  engine  has a thermostatically controlled cooling fan, inspect all 
hoses and ducts  for proper  hook-up  (or every 12 months, whichever 
occurs  first). 
Be sure the valve  works  properly. This is a Noise 
Emission  Control  Service.  Applicable  only  to vehicles  sold  in  the 
United  States. 
DATE  SERVICED BY: ACTUAL  MILEAGE 1 I 
Maintenance  Schedule II - Gasoline  Engines  With 
Heavy  Duty  Emissions 
The  services shown in this schedule  up  to 60.000 miles ( 100 000 kn1) should 
be  performed  after 
60.000 miles ( IO0 000 km) at the same intervals. 
Footnotes 
.I, .!. -~*-~- Drive axle service: 
0 Locking  Differential - Drain fluid and  refill  at  first engine oil change. 
At  subsequent 
oil changes. check fluid 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). 
0 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). 
0 More frequent  lubrication  may be required for heavy-duty or off-road 
use. 
0 3500 HD Models  with  applications requiring extreme overload/trailer 
towing conditions  and  high speed  (above  45 
mph or 72 km/h) 
conditions for extended  periods of time  must  have the drive axle fluid 
changed  every 3.000  miles 
(5 000 km) or 3 months, whichever occurs 
first,  or  rnust  use  75W-140  synthetic tluid  meeting 
GM specifications. 
See  "Recommended  Fluids  and  Lubricants" 
in this section. 
7-52 
ProCarManuals.com