2004 GMC SIERRA DENALI tow bar

Trailer Recommendations
You must subtract your hitch loads from the CWR for
your vehicle. Weigh your vehicle with the trailer
attached, so that you won't go over the GVWR or
GAWR. If you are using a weight-distributing hitch,
weigh the vehicle without the spring bars in place.
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 ªTrailer Towingº 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, ®rst contact GM Customer Assistance for information
on such conversions speci®c to this vehicle. 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 a pickup to permit
its safe use with a specialized body should be
installed by a body builder in accordance with the
information available from GM Customer Assistance.
See
Customer Assistance Offices on page 7-4.
4-57

Do not exceed the maximum allowable tongue weight
for your vehicle. Choose the shortest hitch extension
that will position the hitch ball closest to the vehicle. This
will help reduce the effect of trailer tongue weight on
the rear axle.
After you have loaded the trailer, weigh the trailer and
then the tongue separately, to see if the weights
are proper. If they are not, you may be able to get them
right by moving some items around in the trailer.
Total Weight on Your Vehicle's Tires
Be sure your vehicle's tires are in¯ated to the upper limit
for cold tires. You'll ®nd these numbers on the
Certi®cation label at the rear edge of the driver's door or
see Loading Your Vehicle for more information. Then
be sure you don't go over the GVW limit for your vehicle,
or the GAWR, including the weight of the trailer
tongue. If you use a weight distributing hitch, make sure
you don't go over the rear axle limit before you apply
the weight distribution spring bars.
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.
Weight Distributing Hitches and Weight
Carrying Hitches
When using a weight-distributing hitch, the hitch must
be adjusted so the distance (A) remains the same both
before and after coupling the trailer to the tow vehicle.
If you use a step-bumper hitch, the bumper could
be damaged in sharp turns. Make sure there is ample
room when turning to avoid contact between the
trailer and the bumper.(A) Body to Ground Distance (B) Front of Vehicle
4-63

Loading Your Vehicle.......................................4-48
Loading Your Vehicle for Off-Road Driving..........4-19
Locks
Delayed Locking........................................... 2-8
Door........................................................... 2-6
Power Door.................................................. 2-7
Programmable Automatic Door Locks............... 2-8
Loss of Control...............................................4-17
LOW COOLANT LEVEL..................................3-60
Low Fuel Warning Light...................................3-45
Lumbar
Power Controls............................................. 1-4
M
Maintenance Schedule
Additional Required Services........................... 6-6
At Each Fuel Fill........................................... 6-9
At Least Once a Month................................6-10
At Least Once a Year..................................6-10
Introduction.................................................. 6-2
Maintenance Footnotes.................................. 6-8
Maintenance Record....................................6-16
Maintenance Requirements............................. 6-2
Normal Maintenance Replacement Parts.........6-15
Owner Checks and Services........................... 6-9Maintenance Schedule (cont.)
Recommended Fluids and Lubricants.............6-13
Scheduled Maintenance................................. 6-4
Using Your................................................... 6-3
Your Vehicle and the Environment................... 6-2
Maintenance When Trailer Towing.....................4-68
Making Turns.................................................4-66
Malfunction Indicator Light................................3-40
Manual Selectable Ride..................................... 4-9
Matching Transmitter(s) to Your Vehicle............... 2-5
Memory Seat.................................................2-45
Message
DIC Warnings and Messages........................3-57
Mexico, Central America and Caribbean
Islands/Countries (Except Puerto Rico
and U.S. Virgin Islands)................................. 7-5
Mirrors
Automatic Dimming Rearview with OnStar
ž,
Compass and Temperature Display.............2-31
Outside Automatic Dimming Mirror.................2-35
Outside Convex Mirror.................................2-36
Outside Curb View Assist Mirrors...................2-35
Outside Heated Mirrors................................2-36
Outside Power Foldaway Mirrors....................2-34
Outside Power Mirrors..................................2-34
MyGMLink.com................................................ 7-3
9

Playing a Cassette Tape..................................3-74
Playing a CD.................................................3-77
Playing the Radio...........................................3-66
Power
Accessory Outlets........................................3-18
Door Locks.................................................. 2-7
Electrical System.......................................5-105
Lumbar Controls........................................... 1-4
Seat............................................................ 1-3
Steering Fluid.............................................5-34
Windows....................................................2-14
Power Steering...............................................4-10
Programmable Automatic Door Locks.................. 2-8
Programming the HomeLink
žTransmitter...........2-39
Puddle Lamps................................................3-14
Q
QUADRASTEERŸ..........................................4-12
Questions and Answers About Safety Belts.........1-13
R
Radio Data System (RDS)...............................3-65
Radio Messages.............................................3-71
Radios..........................................................3-64
Care of Your Cassette Tape Player................3-87
Care of Your CD Player...............................3-88
Care of Your CDs........................................3-88Radios (cont.)
CD Changer...............................................3-82
Navigation/Radio System..............................3-79
Radio with Cassette and CD.........................3-65
Rear Seat Audio..........................................3-80
Setting the Time..........................................3-64
Theft-Deterrent............................................3-85
Understanding Reception..............................3-86
RDS Messages..............................................3-70
Rear Axle......................................................5-47
Rear Doors....................................................2-11
Rear Safety Belt Comfort Guides......................1-27
Rear Seat Audio Controls.................................3-80
Rear Seat Audio (RSA)....................................3-80
Rear Seat Operation......................................... 1-8
Rear Seat Outside Passenger Positions.............1-24
Rear Seat Passengers, Safety Belts..................1-24
Rear Seat Top Strap Anchors...........................1-42
Rear Window Defogger....................................3-25
Rearview Mirror, Automatic Dimming
with OnStar
ž, Compass and Temperature
Display......................................................2-31
Reclining Seatbacks.......................................... 1-5
Recommended Fluids and Lubricants.................6-13
Recreational Vehicle Towing.............................4-48
REDUCED ENGINE POWER...........................3-60
Remote Alarm.................................................. 2-4
Remote Keyless Entry System............................ 2-3
Remote Keyless Entry System, Operation............ 2-4
11