
Malfunction  Indicator 
(SERVICE  ENGINE SOON) Lamp 
The  Malfunction  Indicator (SERVICE ENGINE SOON) Lamp on your 
instrument  panel  lets you know  when 
your emission  system needs  service. 
The  light 
will come  on briefly  when  you start your  engine to let  you  know 
that  the system  is working.  If 
it does not come  on when you start  your 
engine, 
or if it comes  on and  stays  on while  you’re  driving,  your system 
may  need  service. Your vehicle  should still be  driveable, but 
you should 
have  your  system serviced right away. 
Secondary  Air  hjection Reaction  (AIR) System 
You  may  have this system.  It  has a control valve  that  will direct air  to  where 
it is  needed. If the  AIR  system  needs service, your Malfunction Indicator 
(SERVICE ENGINE SOON) Lamp  on your  instrument  panel will come on. 
Loading Your Vehicle 
SEE OWNERS MANUAL  FOR ADDITIONAL INFORMATION 
BlKG 
The Certification/Tire 
label  is found on the 
rear  edge  of the 
driver’s door  or 
in the 
Incomplete  Vehicle 
Document 
in the  cab. 
The  label  shows 
the size of your original  tires and the inflation pressures 
needed  to obtain the  gross weight capacity  of your vehicle.  This is called  the 
GVWR  (Gross  Vehicle  Weight  Rating).  The  GVWR  includes the weight of 
the vehicle,  all occupants,  fuel and cargo. 
The  Certification/Tire  label also tells 
you the maximum  weights  for the 
front and rear  axles,  called  Gross  Axle Weight  Rating (GAWR). To find out 
the  actual  loads on your  front  and rear axles, you need  to go  to a weigh 
station and weigh your vehicle.  Your dealer  can  help  you 
with this. Be sure 
to  spread  out  your  load equally 
on both sides of the centerline. 
Never exceed the  GVWR  for your vehicle,  or 
the GAWR for either  the front 
or  rear  axle. 
And, 
if you  do have a heavy  load,  you should  spread it out. 
6-65 
ProCarManuals.com 

A CAUTION: 
In the  case  of a sudden stop  or collision,  things  carried in the  bed 
of your  truck  could shift forward  and come  into the passenger 
area,  injuring  you and  others. 
If you put things  in the  bed of 
your  truck,  you should  make  sure they  are properly  secured. 
A CAUTION: 
Do not  load your vehicle  any heavier  than  the GVWR or the 
maximum  front  and  rear 
GAWRs. If you  do, parts on your 
vehicle-can break,  or  it can change  the way  your  vehicle  handles. 
These  could  cause  you to lose  control.  Also,  overloading  can 
shorten  the Iife 
of your  vehicle. 
Using  heavier suspension  components to get added durability might not 
change  your  weight ratings. 
Ask your dealer to help  you load your  vehicle 
the  right 
way. 
NOTICE: 
Your  warranty does not  cover  parts or components  that fail 
because 
of overloading. 
If you put  things inside your  vehicle-like suitcases, tools, packages,  or 
anything  else-they 
go as fast as the vehicle goes. If you have to stop or 
turn quickly,  or if there  is a crash,  they’ll  keep  going. 
6-66 
ProCarManuals.com 

Trailering  Package 
If your vehicle comes with the Trailering  Package,  there is also a load rating 
which  includes  the weight 
of the vehicle and the trailer  it tows.  This rating 
is called  the Gross  Combination  Weight Rating (GCWR). 
When  you  weigh your trailer, be  sure 
to include the weight of everything 
you  put 
in it. And,  remember  to  figure  the  weight of the people inside as 
part of your  load. 
Your  dealer  can help  you determine  your  GCWR. 
6-67 
ProCarManuals.com 

Add-on Equipment 
When you carry removable  items, like snow  plow blades,  you  may  need to 
put 
a limit on how  many  people you carry inside your vehicle. Be sure  to 
weigh your vehicle before  you  buy  and install the new equipment. 
i 
NOTICE: 
Your  warranty  doesn’t  cover  parts or components  that  fail 
because 
of overloading. 
Truck-Camper  Loading  Information 
Open your glove  box door  and look for this label: 
This  label  will 
tell you  how  much of a load your vehicle can carry, and how 
to  spread out your load the right  way. 
Also, it will help you match the right 
slide-in  camper to your vehicle. 
When you carry  a slide-in  camper, 
the total cargo load of your vehicle is the 
weight 
of the camper, plus 
everything  else  added to the camper  after it left the factory; 
0 everything  in the camper: and 
0 all the people inside. 
The  Cargo  Weight Rating  (CWR) 
is the maximum weight of the load your 
vehicle  can carry.  It doesn’t include the weight 
of the people  inside. But, 
you  can figure  about 
150 pounds  for each seat. 
The  total  cargo 
load must not  be more  than your  vehicle‘s  CWR. 
6-68 
ProCarManuals.com 

TRUCK  LOADING  INFORMATION 
A 
I. Recommended 
location for  cargo 
center  of gravity 
for  cargo  weight 
rating  (Pickup 
Truck). 
0 Refer  to the Truck  Camper  Loading  Information  label in glove box for 
“A”and 
“B” dimensions.  Use the rear  edge of the load floor  for 
measurement purposes. 
EXAMPLE OF PROPER  TRUCK  AND  CAMPER  MATCH 
1. Camper  center of 
gravity 
2. Recommended 
center 
of gravity 
location zone. 
The  camper’s  center 
of gravity  should  fall within the  center of gravity  zone 
for  your  vehicle’s  cargo  load. 
You must weigh  any accessories  or  other  equipment  that you add to your 
vehicle. 
Then, subtract  this  extra  weight from  the CWR. This  extra  weight 
may  shorten  the center  of gravity  zone 
of your vehicle.  Your dealer  can help 
you with this. 
If  your  slide-in  camper and 
its load weigh less than the CWR, the center of 
gravity zone  for  your  vehicle  may  be larger. 
Your  dealer  can help  you make 
a good  vehicle-camper  match. He’ll also 
help you determine  your CWR. 
6-69 
ProCarManuals.com 

After you’ve  loaded your vehicle and camper,  drive to a weigh station  and 
weigh 
on the  front  and rear wheels separately.  This will tell  you the loads on 
your  axles.  The  loads 
on the front and rear axles shouldn’t be more  than 
either  of the GAWRs.  The total 
of the axle  loads should  not  be more than 
the GVWR. 
Open  your driver’s door and  look at 
the CertificatiodTire  label to find  out 
your  CWAR  and GVWR. 
If 
you’ve gone  over  your weight ratings, move  or take  out  some  things until 
all the weights fall below the ratings.  Of course,  you should  always  tie down 
any  loose  items  when  you  load  your vehicle or camper. 
When  you install and load your  slide-in camper, check the  manufacturer’s 
instructions. 
If 
you want more information  on curb  weights,  cargo weights,  cargo weight 
rating and the correct center  of gravity zone for your vehicle, your  dealer 
can help 
you. Just  ask for  a  copy of “Consumer  Information,  Truck-Camper 
Loading.” 
Trailer  Recommendations 
You  must subtract your  hitch loads from  the CWR  for  your vehicle. Weigh 
your  vehicle  with 
the trailer hitch attached, so that you won’t go over the 
GVWR  or  the GAWR. 
You’ll get the best performance if you  spread  out the weight  of your load 
the right  way,  and if‘ you choose the correct  hitch and trailer brakes. 
For  more  information,  see  “Trailer Towing’’ 
in the Index. 
Pickup  Conversion To Chassis Cab 
General  Motors  is aware  that some  vehicle  owners  may consider  having the 
pickup box removed and 
a commercial  or recreational  body installed. 
Before 
you do so, first  contact the GM Zone Office for your area  for 
information on such  conversions.  (See the “Warranty  and  Owner 
Assistance”  booklet  for  Zone  Office.)  Owners  should be aware that,  as 
manufactured,  there are differences between  a  chassis  cab and a pickup  with 
the  box  removed  which  may  affect vehicle safety.  The  components 
necessary  to  adapt 
the pickup to permit  its safe  use  with a specialized  body 
should  be installed  by a body  builder 
in accordance with the information 
available  from 
the Zone Office. 
6-70 
ProCarManuals.com 

Tf you are  skilled  enough to do  some  work on your vehicle,  you will 
probably  want to  get  the service  information 
GM publishes.  For information 
on how 
to obtain  various  service publications  for your vehicle,  see  “Service 
Publications” 
in the Index. You will  find  a  list of publications  and an  order 
form 
in the back  of the book. 
Scheduled  Maintenance  Services 
This part  tells you the maintenance  services that you should  have done  and 
the  times you  should  schedule them. Your 
GM dealer  knows  your  vehicle 
best and wants  you to be  happy with 
it. If you go  to your dealer  for  your 
service  needs, you’ll know that GM-trained  and supported  service people 
will  perform  the work  using  genuine 
GM parts. 
These  schedules  are  for  vehicles that: 
0 carry passengers  and cargo  within the  recommended  limits.  You will 
find  these  limits on your vehicle’s  Certification  Label.  See “Loading 
Your  Vehicle’’  in  the Index. 
are driven on  regular road surfaces,  and within legal  driving  limits, as 
described in Section 4 “Your Driving and  the Road.” 
0 are  driven  off-road in the recommended  manner. See “Off  Road 
Driving  With  Your  Four-wheel  Drive  Vehicle” 
in the Index. 
0 use the recommended fuel. See “Fuel” in the Index. 
Selecting  the Proper Maintenance  Services 
To find  the proper  maintenance  schedule  for  your  vehicle, you must know 
two  things.  What  engine  your  vehicle  has, and how you 
use your  vehicle. 
Your  engine  type will tell 
you which  chart to use, and your  driving 
conditions  will tell 
you which schedule  to use. ’The charts  are  found later in 
this section. 
Selecting  the  Proper  Maintenance  Chart 
Your engine  type (Gasoline  or Diesel)  and its  emissions  classification  (Light 
Duty  or Heavy  Duty Emissions)  will 
tell you which  maintenance  chart  to 
use. Find  your Vehicle  Identification  Number  (VIN),  and look  at  the eighth 
character 
to see  what  your  engine  code  is.  Then use the following  Engine 
Emissions  Classifications  tables 
to find  your  emissions  classification. 
Your  VIN is  on the plate on the top left corner of your instrument 
panel, the  Certification  Label and on the  Service  Parts  Identification 
Label.  See  “Vehicle Identification  Number’’ 
in the Tndex. 
If your  engine  has more than  one  emissions  classification,  look at your 
Certification  Label to see what  your  Gross  Vehicle  Weight  Rating 
(GVWR) 
is. See  “Loading  Your Vehicle” in the Index. 
7-3 
ProCarManuals.com 

USAGE FLUIDLUBRICANT 
Propeller  Shaft 
SplineNniversal  Joint Chassis  Lubricant  (GM  Part 
No.  12346003  or  equivalent)  or  lubricant 
meeting  requirements 
of NLGI  Grade  2, 
Category  LB 
or GC-LB. 
Automatic  Transmission  Shift  Engine  Oil  (GM  Part 
No. 1050109  or 
Linkage,  Floor  Shift  Linkage,  equivalent). 
Hood and  Door  Hinges,  Body 
Door  Hinge  Pins,  Tailgate 
Hinge  and  Linkage,  Folding 
Seat, 
Fuel Door  Hinge 
Key  Lock  Cylinders 
Chassis  Lubrication 
Windshield  Washer  Solvent  and  Anti-Freeze 
Weatherstrip  Squeaks 
Weatherstrip  Conditioning 
Outer  Tailgate  Handle  Pivot 
Points  Engine  Oil 
(GM Part No. 1050109 
or 
equivalent)  or  a synthetic  light  weight 
engine  oil  (SAE  5W-30). 
Chassis  Lubricant  (GM  Part 
No. 12346003  or  equivalent)  or  lubricant 
meeting  requirements  of  NLGI Grade  2, 
Category  LB  or  GC-LB. 
GM  Optikleen  washer  solvent  (GM  Part 
No. 105 15 15 or equivalent). 
Spray-A-Squeek  (GM  Part 
No. 
1052277). 
Dielectric  Silicone  Grease  (GM  Part  No.  12345579  or  equivalent). 
Multi-Purpose  Lubricant  (GM  Part 
No.  12345  120 
or equivalent). 
7-28 
ProCarManuals.com