
Every 50,000 Miles (83 000 km) 
Automatic Transinission Service 
Every 60,000 Miles (100 000 km) 
Spark Plug Wire  Inspection 
Exhaust  Gas Recirculation  (EGR) System Inspection 
Fuel  Tank,  Cap and Lines Inspection 
Evaporative Control System Inspection 
Electronic  Vacuum Regulator  Valve 
(EVRV j Inspection 
Schedule  I1 Definition - Gasoline Engines  With  Heavy  Duty 
Emissions 
Follow Schedule TI only if none of the  conditions  from Schedule I is true. 
Schedule  I1 Intervals - Gasoline  Engines with-Heavy  Duty 
Emissions 
Every 
6,000 Miles (10 000 km) 
Engine Oil and Filter Change (or every 3 months.  whichever occurs  first) 
Clussis Lubrication (or every 3 months,  whichever occurs first) 
Drivc Axle  Scrvice 
At 6,000 Miles (10 000 km) - Then  Every 12,000 Miles (20 000 km) 
Tire Rotation 
Every 12,000 Miles (20 000 km) 
1 
Engine Accessory  Drive  Belt Inspection 
Shields  and Underhood  Insulation Inspection 
Thermostatically  Controlled Engine Cooling 
Fan Check (or every 12 
months, whichever  occurs  first) 
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Every 24,000 Miles (40 000 km) 
Cooling  System  Service (or every  24 months,  whichever  occurs  first) 
Air  Cleaner  Filter Replacement 
Front Wheel  Bearing Repack  (or at Each  Brake  Relining)  (2-Wheel Drive 
Only 
1 
Fuel Filter  Replacement 
Engine  Timing Check 
Thermostatically  Controlled Air  Cleaner  Inspection 
Air Intake  System Inspection 
Every 27,000 Miles (45 000 km) 
Spark  Plugs  Replacement 
Every 30,000 Miles (50 000 km) 
Clutch Fork Ball Stud Lubrication  (5-Speed Transmission with Deep-Low 
Only) 
Every 50,000 Miles (83 000 km) 
Automatic  Transmission  Service 
Every 60,000 Miles (100 000 km) 
Spark Plug Wire Inspection 
Exhaust 
Gas Recirculation  (EGR) System Inspection 
Fuel  Tank,  Cap and Lines  Inspection 
Evaporative  Emission  Control  System Inspection 
Electronic  Vacuum Regulator  Valve (EVRV) Inspection 
Schedule I Definition - Diesel Engines 
Follow  Maintenance  Schedule I if any one of these is true  for your  vehicle: 
0 
0 
0 
0 
Most trips  are less  than 5 to 10 miles (8 to 16 km).  This is particularly 
important  when outside  temperatures  are  below freezing. 
Most trips  include  extensive  idling  (such as  frequent  driving 
in stop and 
go traffic). 
You  operate  your  vehicle 
in dusty  areas or off-road  frequently. 
You  frequently  tow 
a trailer. 
Schedule I should also be followed if the vehicle is used for delivery 
service.  Dolice, taxi, 
or other commercial  application. 
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I Schedule  I  Intervals - Diesel  Engines I 
Every 2,500 Miles (4 000 km) 
Engine Oil  and Filter  Change  (or every 3 months, whichever occurs  first) 
Chassis  Lubrication  (or every 
3 months, whichever  occurs  first) 
Air  Cleaner  Filter Inspection. 
if Driving in Extremely Dusty or Dirty 
(Off-Road)  Conditions 
Every 5,000 Miles (8 000 km) 
Drive Axle Service 
Every 7,500 Miles (12 000 km) 
Air Cleaner Filter Inspection, if Driving in Dusty Conditions 
At 7,500 Miles (12 000 km) - Then  Every 15,000 Miles  (24 000 km) 
Tire Rotation 
Every 10,000 Miles (I 6 000 km) 
Shields  and Underhood Insulation Inspection 
Thermostatically  Controlled Engine Cooling  Fan Check  (or every 
12 
months,  whichever  occurs  first) 
Air Intake System Inspection 
Every 15,000 Miles  (24 000 km) 
Air Cleaner  Filter Replacement 
Front Wheel Bearing Repack 
(or at  Each  Brake Relining)  (2-Wheel  Drive 
Only j 
Every 30,000 Miles (50 000 km) 
Clutch Fork Ball Stud Lubrication  (%Speed  Transmission  with  Deep-Low 
Only:) 
Fuel Filter  Replacement 
Cooling 
System Service (or every 24 months, whichever  occurs  first) 
Every 50,000 Miles (80 000 km) 
Automatic Transmission Service 
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Every 60,000 Miles (100 000 km) 
Crankcase Depression  Regulator Valve (CDRV)  System  Check 
Engine  Accessory  Drive Belt Inspection 
Fuel Tank,  Cap and Lines  Inspection 
Evaporative  Control System Inspection 
Exhaust  Gas Recirculation  (EGR) System  Inspection 
(if equipped) 
Exhaust  Pressure  Regulator Valve Inspection 
I Schedule 11 Definition - Diesel Engines 
Follow  Schedule II on!\- if none ofrhe conditions i'wm Schcdtilc I Is truc. 
-- 
I Schedule  I1 lntervals - Diesel  Engines 1 
Every 5,000 Miles (8 000 km) 
Engine Oil and Filter  Change (or every 12 months, whichever  occurs  first) 
Chassis  Lubrication 
(or every 12 months,  whichever  occurs  first) 
Drive  Axle Service 
At 5,000 Miles (8 000 km) - Then  Every 10,000 Miles (16 000 km) 
Tire Rotation 
Every 10,000 Miles (16 000 km) 
Shields  and Underhood  insulation  Inspection 
Air Intake  System Inspection 
Thermostatically  Controlled Engine  Cooling  Fan Check  (or every 
I2 
months,  whichever  occurs  first) 
Every 30,000 Miles (48 000 km) 
Cooling  System  Service  (or every 24 months,  whichever  occurs  first) 
Front Wheel  Bearing Repack  (or 
at Each Brake  Relining)  (2-Wheel  Drive 
Fuel  Filter  Replacement 
Air  Cleaner  Filter Replacement 
Clutch Fork  Ball  Stud Lubrication  (5-Speed Transmission  with  Deep-Low 
Only) 
Only) 
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60,000 Miles (100 000 km) 
c; 
0 
0 
0 
il 
0 
Change  engine oil and filter  (or every 3 tnonths. whichever occurs 
first). 
AI? Emission Control Service. 
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 
6 months, whichever occurs  first). 
Check rear/fi-ont axle fluid level and add fluid as needed. Check 
constant 
-\;elociry joint5 and axle seals for leaking.';'';' 
For  2-Wheel  Drive vehicles only: Clean and repack the front  wheel 
bearings  (or at each brake relining, whichever  occurs  first). 
Inspect  engine accessory drive belt. 
An Emissiolz  Comrol  Ssrvice. 
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. 
,411 Erltission Control 
Service. 
Replace spark plugs. AI? Emission Control Service.. 
Replace air  cleaner  filter. Replace filter  more often  under dusty 
conditions. 
Arz Emission Colztrol Service. 
Inspect fuel  tank,  cap and lines  for  damage  or leaks . Inspect fuel  cap 
gasket  for any  damage.  Replace parts  as needed. 
A17 E~nission Control 
Service. -i- 
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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. 
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Maintenance  Schedule I - Gasoline  Engines  Heavy 
Duty  Emissions 
12,000 Miles (20 000 km) 
0 
0 
0 
CI 
Change  engine  oil and filter (or every 3 months, whichever  occurs 
first). 
An Emission  Control Service. 
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 
I2 months,  whichever occurs  first). 
Check  readfront  axle fluid level  and add fluid as needed. Check 
constant  velocity  joints and axle  seals for leaking.'k'k 
For  2-Wheel  Drive vehicles  only: Clean and repack  the front  wheel 
bearings  (or at each brake  relining, whichever  occurs first). 
Tnspect  air  cleaner  filter 
if you are driving in dusty  conditions.  Replace 
filter 
if necessary. An Ewission Control  Senice. 
Replace  fuel filter. Replace filter sooner  if  it is clogged? 
Inspect accessory  drive  (serpentine)  belt for  cracks,  fraying  and wear 
and  check belt  for proper tension. Adjust  or replace  belt 
as needed. AH 
Emission  Control Service. 
Inspect shields and underhood insulation for  damage  or looseness. 
Adjust  or replace  as required. 
This  is a Noise  Emission  Control 
Service.  Applicable  only  to  vehicles  sold  in  the  United  States.\
 
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 
I 
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Maintenance  Schedule I - Gasoline  Engines  Heavy 
Duty Emissions 
24,000 Miles (40 000 km) 
0 Change  engine oil and filter (or every 3 months, whichever  occurs 
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 
IO" 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). 
first). 
An Emission Control Service. 
0 Check  rear/front 
axle fluid  level  and add  fluid as needed. Check 
constant  velocity  joints and axle seals for  leaking.'!''" 
3 Replace  air cleaner filter. Replace filter  more often under dusty 
conditions. 
An Em'ssiolz Control Sen?ice. 
3 For  2-Wheel  Drive vehicles only: Clean  and  repack the front wheel 
Z Replace fuel filter. Replace filter sooner if it is clogged.+ 
3 Adjust  timing  to underhood  label specifications. Inspect  the inside and 
outside  of the  distributor  cap  and rotor  for cracks. carbon tracking  and 
corrosion.  Clean or replace 
as needed. An E~~zission Control Senice. 
This  is a Noise  Emission  Control  Service. 
bearings  (or at each brake relining,  whichever occurs  first). 
If your vehicle has  a thermostatically  controlled  air cleaner, inspect all 
hoses and ducts for proper  hook-up. Be sure the valve works properly. 
An Emission Co11trol Service. This  is a Noise  Emission  Control 
Service. 
Inspect accessory  drive  (serpentine)  belt for cracks,  fraying and wear 
and  check  belt for proper tension. Adjust or replace  belt 
as needed. An 
Emission Control Service. 
0 Inspect shields and underhood insulation for  damage  or looseness. 
Adjust 
or replace as required. This  is a Noise  Emission  Control 
Service.  Applicable 
only to  vehicles  sold in the  United  States. 
(Continued) 
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