
Loading Your Vehicle 
- 
DSI/KPA (COL3) 
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  CertificatiodTire  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. 
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. 
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ProCarManuals.com 

Total  Weight  on  Your  Vehicle’s  Tires 
Be sure your vehicle‘s tires are inflated to the limit for cold tires.  You’ll find 
these numbers  on the  Certification  label  at the rear 
edge of  the  driver’s  door 
or  see  “Tire Loading“ 
in the Index. Then  be sure  you don‘t go over  the 
GVW limit for your  vehicle,  includins  the weight of the  trailer  tongue. 
Hitches 
It’s  important to have  the correct  hitch equipment.  Crosswinds,  large trucks 
going  by, and rough roads are 
a few reasons why you’ll  need  the  right  hitch. 
Here  are  some  rules to follow: 
e 
e 
If you use a step bumper hitch,  and your trailer tongue has a V-shaped 
foot.  your  bumper  could be damaged 
in sharp  turns. Check the distance 
from the front  edge 
of the foot  to the  middle  of  the hitch ball socket. If 
the distance  is less  than 12 inches, take  the foot  off the trailer tongue. 
If  you‘ll  be pulling  a  trailer  that, when  loaded, 
will weigh  more  than 
4,000  pounds 
( 1 8 14 kg)  be sure  to use  a properly  mounted, 
weight-distributing  hitch and sway control 
of the  proper  size.  This 
equipment  is very  important  for  proper  vehicle loading and good 
handling  when you’re  driving. 
Safety  Chains 
You should  always  attach chains  between  your vehicle and your trailer. 
Cross  the safety  chains under the tongue 
of the trailer so that the tongue will 
not drop  to  the road if it becomes  separated from the hitch.  Instructions 
about  safety  chains  may be provided  by the hitch manufacturer  or by  the 
trailer  manufacturer. Follow  the manufacturer’s  recommendation  for 
attaching  safety chains  and do not  attach them to  the bumper. Always  leave 
just  enough  slack 
so you can turn with your rig.  And, never allow  safety 
chains  to  drag  on  the ground. 
Trailer  Brakes 
If your  trailer weighs  more than 1,000 pounds  (450 kg) loaded,  then it needs 
its own  brakes 
- and they must be adequate.  Be  sure to read and follow  the 
instructions  for  the trailer brakes 
so you’ll be able to install.  adjust and 
maintain them  properly. 
Your  trailer  brake  system can tap  into your  vehicle’s  hydraulic brake system, 
but  consider  the following: 
Don’t tap  into your vehicle’s brake  system if the trailer’s  brake  system 
will  use more  than 0.02  cubic  inch (0.3~~) 
of fluid from  your vehicle’s 
master cylinder. 
Tf it does,  both braking  systems won’t work well. You 
could even lose your brakes. 
4-45 
ProCarManuals.com 

Jack  and Jacking  Tool  Storage - Chassis  Cab  Models 
a -1 
Jacking  Tool  Storage - Chassis  Cab  Models 
a -1 
3 
3 
1. Nut 
2. Jack  Handle Extension 
3. Wheel  Wrench 
4. Jack  and  Tool Storage  Box 
5. Ratchet 
6. Jack  Handle 
7. Tool Retainer 
8, Jack 
To Remove  the  Spare  Tire 
The  spare  tire, if you have one, is full size like the other  tires on your 
vehicle. 
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ProCarManuals.com 

When it’s Time for  New  Tires 
You need a new  tire if: 
Tread  Wear 
Indicators 
One  way to tell when 
it’s  time for new  tires 
is  to check  the 
treadwear indicators, 
which  will appear 
when  your tires have 
only 
1/16 inch  (1.6 
mm) 
or less of tread 
remaining. 
0 You  can see the indicators  at three  or more places around  the tire. 
0 You can  see  cord or fabric  showing through  the  tire’s rubber. 
The tread  or sidewall  is cracked,  cut  or snagged  deep enough  to show 
cord 
or fabric. 
The  tire has a bump, bulge  or split. 
The  tire has  a puncture,  cut,  or  other  damage  that can‘t  be repaired well 
because 
of the  size  or  location of the damage. 
Dual Tire  Operation 
When the  vehicle is new,  or whenever a wheel,  wheel  bolt  or wheel  nut is 
replaced,  check the wheel 
nut torque after 100, 1,000 and 6,000  miles (160, 
1 600 and 10 000 km) of driving.  For proper torque  see “Wheel Nut 
Torque”  in the Index. 
The  outer  tire 
on a  dual wheel  setup generally  wears  faster than  the  inner 
tire.  Your  tires will wear more evenly and last  longer 
if you rotate the tires 
periodically.  If you’re  going  to  be doing 
a lot of driving  on  high-crown 
roads, you can reduce tire wear  by adding 
5 psi (35 kPa)  to the  tire  pressure 
in  the  outer  tires. Be  sure  to return 
to the recommended  pressures  when no 
longer  driving  under those conditions. 
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ProCarManuals.com 

A CAUTION: 
If you operate your vehicle  with a tire  that is badly 
underinflated,  the  tire  can overheat. An overheated  tire 
can lose 
air suddenly or catch  fire. You or others  could be injured. Be 
sure  all tires  (including  the  spare, if any)  are properly  inflated. 
Buying New Tires 
To find out what  kind and size  of tires  you need, look  at the 
CertificationRire  label. 
The  tires  installed  on your  vehicle when 
it was new  a  Tire  Performance 
Criteria  Specification  (TPC Spec)  number  on  each  tire’s sidewall.  When you 
get  new  tires,  get  ones  with that same  TPC  Spec  number. That way, your 
vehicle will  continue to have tires that  are designed  to  give proper 
endurance,  handling,  speed rating, traction,  ride  and other  things  during 
normal  service on your  vehicle. 
If your tires have  an all-season  tread 
design,  the TPC  number  will  be followed  by an 
“MS” (for  mud  and snow). 
If  you  ever  replace  your tires with  those  not having  a TPC  Spec  number, 
make  sure they  are the  same.  size, load range,  speed  rating  and construction 
type  (bias,  bias-belted  or radial)  as your  original  tires. 
I A CAUTION: 
Mixing tires could cause you to lose  control  while  driving. If you 
mix  tires  of different  sizes or types  (radial  and  bias-belted  tires), 
the  vehicle  may  not handle properly,  and you could have 
a crash. 
Be sure  to  use the same  size and  type  tires  on all four  wheels. 
Uniform  Tire  Quality  Grading 
The  following  information  relates to the system  developed  by the United 
States  National  Highway Traffic  Safety Administration  which  grades tires 
by  treadwear, traction  and  temperature  performance. 
(This applies  only to 
vehicles  sold in the  United  States.) 
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ProCarManuals.com 

Whenever a wheel, wheel bolt or wheel nut is replaced on a dual wheel 
setup, check  the wheel nut torque after 100, 1,000 and 6,000 miles ( 160, 
1 600 and 10 000 km) of driving.  For proper  torque,  see “Wheel Nut 
Torque” in the  Index. 
Used Replacement Wheels 
A CAUTION: 
Putting a used  wheel  on your  vehicle is dangerous. You can’t 
know 
how it’s  been  used  or how  many  miles  it’s  been  driven. It 
could  fail suddenly  and cause  an accident. If you have  to replace 
a wheel  use a new GM original equipment  wheel. 
7 
c 
‘ire Chains 
NOTICE: 
If your  vehicle  has dual  wheels  or LT265/75R16 size  tires,  don’t 
use  tire  chains;  they  can damage your  vehicle. 
If you  don’t  have dual wheels  or if  you  have a tire size  other 
than 
LT26975R16, use  tire  chains  only  where  legal  and only 
when  you  must.  Use  chains that  are  the proper  size for your 
tires.  Install them  on the  tires  of the  rear  axle. 
Don’t  use  chains on the  tires 
of the  front  axle. 
Tighten them 
as tightly  as possible  with  the ends  securely 
fastened.  Drive  slowly  and follow  the chain manufacturer’s 
instructions.  If  you can  hear  the  chains contacting your  vehicle, 
stop  and  retighten  them.  If the contact  continues,  slow down 
until  it stops.  Driving  too  fast 
or spinning the wheels  with  chains 
on 
will damage your  vehicle. 
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ProCarManuals.com 

Appearance  Care  Materials  Chart 
PART NO. 
1050172 1050173 
1050 174  10502 
14 
1050244 
1050427 
1050429 
1050729 
1051055  1051398 
1052870  105020 
1 
SIZE 
16  oz.  (0.473L) 
16 
oz. (0.473L) 
16 
oz. (0.473L) 
32 
oz. (0.946L) 
16 oz.  (0.473L) 
23 
oz. (0.680L) 
6  Ibs.  (2.72 
kg) 
8 oz. (0.237L) 
16 oz. (0.473L) 
8 oz.  (0.237L) 
16 oz. (0.473L) 
16 oz. (0.473L) 
PRODUCT 
Tar and Road 
Oil  Remover 
USAGE 
Removes old 
waxes, polishes, 
tar and road oil 
Chrome  Cleaner  Removes 
rust 
and Polish  and corrosion on 
chrome 
and 
stainless steel 
White Sidewall 
Tire  Cleaner 
Vinyl  Leather 
Cleaner 
Fabric  Cleaner 
Glass Cleaner 
Multi-Purpose 
Powder  Cleaner 
Vinyl Top 
Cleaner 
Preservatone 
Spot Lifter 
Wash-Wax  (conc 
.) 
Magic Mirror 
Cleaner-Polish  Cleans 
white 
and  black  tires 
Spot 
and stain 
removal  on 
leather  or 
vinyl 
Spot and stain 
removal on cloth  and  fabric 
Glass cleaning 
and spot 
cleaning  on 
vinyls 
Cleans 
vinyl and 
cloth on door 
trim,  seats,  and 
carpet-also  tires and mats. 
Cleaning 
of 
vinyl tops 
Vinyl  top 
dressing 
Spot  and stain 
removal  on cloth 
and  fabric 
Exterior  wash 
Exterior cleaner 
and polish 
6-75 
ProCarManuals.com