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MMT In Gasoline
MMT is a manganese-containing metallic additive that is
blended into some gasoline to increase octane. Gasolines
blended with MMT provide no performance advantage
beyond gasolines of the same octane number without
MMT. Gasolines blended with MMT reduce spark plug
life and reduce emission system performance. We recom-
mend that gasolines free of MMT be used in your vehicle.
The MMT content of gasoline may not be indicated on
the gasoline pump; therefore, you should ask your gaso-
line retailer whether or not his/her gasoline contains
MMT.
It is even more important to look for gasolines without
MMT in Canada because MMT can be used at levels
higher than allowed in the United States. MMT is pro-
hibited in Federal and California reformulated gasolines.
Sulfur In Gasoline
If you live in the northeast United States, your vehicle
may have been designed to meet California low emission
standards with Cleaner-Burning California reformulated
gasoline with low sulfur. If such fuels are not available in
states adopting California emission standards, your ve-
hicles will operate satisfactorily on fuels meeting federal
specifications, but emission control system performance
may be adversely affected. Gasoline sold outside of
California is permitted to have higher sulfur levels which
may affect the performance of the vehicle's catalytic
converter. This may cause the Check Engine or Service
Engine Soon light to illuminate. We recommend that you
try a different brand of unleaded gasoline having lower
sulfur to determine if the problem is fuel related prior to
returning your vehicle to an authorized dealer for ser-
vice.
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CAUTION!
If the Check Engine or Service Engine Soon light is
flashing, immediate service is required; see onboard
diagnostics system section.
Materials Added To Fuel
All gasolines sold in the United States are required to
contain effective detergent additives. Use of additional
detergents or other additives is not needed under normal
conditions and would result in unnecessary cost. There-
fore, you should not have to add anything to the fuel.
ADDING FUEL
NOTE:If fuel is poured from a portable container, the
container should have a flexible nozzle long enough to
extend into the fuel filler tube.
CAUTION!
To avoid fuel spillage and overfilling, do not ªtop
offº the fuel tank after filling.
NOTE:When the fuel nozzle ªclicksº or shuts off, the
fuel tank is full.
NOTE:Tighten the gas cap until you hear a ªclickingº
sound. This is an indication that the gas cap is properly
tightened. Make sure that the gas cap is tightened each
time the vehicle is refueled.
WARNING!
A fire may result if gasoline is pumped into a
portable container that is inside of a vehicle or on a
truck bed. You could be burned. Always place gas
containers on the ground while filling.
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Fuel System Cautions
CAUTION!
Follow these guidelines to maintain your vehicle's
performance:
²The use of leaded gas is prohibited by Federal law.
Using leaded gasoline can impair engine performance,
damage the emission control system, and could result
in loss of warranty coverage.
²An out-of-tune engine, or certain fuel or ignition
malfunctions, can cause the catalytic converter to
overheat. If you notice a pungent burning odor or
some light smoke, your engine may be out of tune or
malfunctioning and may require immediate service.
Contact your dealer for service assistance.
²When pulling a heavy load or driving a fully loaded
vehicle when the humidity is low and the temperature
is high, use a premium unleaded fuel to help prevent
spark knock. If spark knock persists, lighten the load,
or engine piston damage may result.
²The use of fuel additives which are now being sold as
octane enhancers is not recommended. Many of these
products contain high concentrations of methanol.
Fuel system damage or vehicle performance problems
resulting from the use of such fuels or additives is not
the responsibility of the manufacturer and may not be
covered under the New Vehicle Warranty.
NOTE:Intentional tampering with emissions control
systems can result in civil penalties being assessed
against you.
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2500/3500 Models
²
The Axles on 2500/3500 Modelsare trailer tow ready
andDO NOT REQUIREany special axle lubes or
additives.
Trailer Towing Recommendations
²
All trailer hitches should be professionally installed on
your vehicle.
²Safety chains must always be used between your
vehicle and trailer.
²Donotinterconnect the hydraulic brake system or
vacuum system of your vehicle with that of the trailer.
This could cause inadequate braking and possible
personal injury. An electrically±actuated electric trailer
brake controller is recommended.
²Trailer brakes are recommended for trailers over 1000
lbs (454 kg) and are required for trailers in excess of
2,000 lbs (907 kg)
²Use an approved wiring harness connector on the
trailer. Standard equipment on all RAM pickup mod-
els provides a 4-way trailer tow connector located
under the bumper. This connector contains the follow-
ing vehicle circuits: park/tail lamps, left stop/turn
lamp, right stop/turn lamp, and ground. With the
optional Trailer Tow Prep package a 7-way connector
is provided with the following additional circuits:
backup lamp, trailer battery and electric brake.
NOTE:Connect trailer lighting and brakes using factory
harnesses only. Do not cut or splice wiring to the brake
circuits.
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Connecting Trailer Lighting And Electric Trailer
Brakes
NOTE:A 4-way trailer tow connector, located behind
the bumper, is standard equipment on all Ram pickup
models. This connector contains the following vehicle
circuits: park/tail lamps, left stop/turn lamp, right stop/
turn lamp, and ground. With the optional Trailer Tow
Prep package a 7-way connector is also provided with the
following additional circuits: backup lamp, trailer battery
and electric brake.
NOTE:There is also a 4±way connector located under
the instrument panel, located to the left of the brake
pedal that is used for the electric brake. This connector
contains the following vehicle circuits; power ground,
battery, stop lamp switch and electric brake feed. The
4±way is optional with the trailer tow prep package.
CAUTION!
Adding lights or electrical devices to the headlamp/
park lamp circuit can be accomplished by connecting
to the standard 4-way trailer tow connector located
behind the rear bumper. The maximum current ca-
pacity for the park lamp circuit should not exceed 15
amps total (a typical park lamp bulb can draw from
0.5 to 1.0 amperes of current).
No connections can be made to the headlamp switch
itself, because it is not designed for high current
applications. Connections to the headlamp switch
will cause the exterior lights to malfunction.
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CAUTION!
Connect trailer lighting and brakes using factory
harnesses only. Do not cut or splice wiring to the
brake circuits. Use an approved wiring harness con-
nector on the trailer.
Trailer Weight and Trailer Tongue Weight
Gross Trailer Weight (GTW) means the weight of the
trailer plus the weight of all cargo, consumables and
equipment loaded on the trailer when in actual under-
way towing condition. The recommended way to mea-
sure GTW is to put your fully loaded trailer on a vehicle
scale. The entire weight of the trailer must be supported
by the scale.
Tongue Weight is the weight placed on the vehicle's
trailer hitch by the trailer. Always load a trailer with 60%to 65% of the weight in the front of the trailer. This places
10% to 15% of the GTW on the tow hitch of your vehicle.
Trailer sway control and equalizing hitch are required for
Class III or IV trailer hitches and tongue weights above
350 lbs (159 kg).
Tongue weight must be equal to at least 10% of GTW, but
no more than 15% of GTW.
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²Air ConditioningÐturn it off temporarily.
²Hilly TerrainÐTurn overdrive off.
See Cooling System Operating information in the Service
and Maintenance section of this manual for more infor-
mation.
Automatic Transmission Oil Temperature Warning
Light
All vehicles with automatic transmissions are equipped
with a transmission sump oil temperature sensor and
warning light. If elevated transmission temperatures are
encountered, the engine controller will select the most
desirable gear until the transmission temperatures are
reduced. If transmission oil temperatures continue to
rise, a warning light located in the instrument cluster will
illuminate. If this should occur, stop the vehicle, shift to
Neutral, and run the engine at idle or faster until the light
goes off.
Towing With An Automatic Transmission
Vehicles equipped with an automatic transmission may
shift into and out of Overdrive, or a lower gear, when
driving in hilly areas, when heavily loaded, or when
towing into heavy winds.
When this condition occurs, select TOW/HAUL mode or
shift into a lower gear to prevent excessive transmission
wear and/or overheating, and to provide better engine
braking.
NOTE:Do not exceed the following RPM while manu-
ally downshifting:
²5800 rpm with 3.7L engines.
²5800 rpm with 4.7L engines.
²5600 rpm with 5.7L engines.
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2004 BODY BUILDER'S GUIDE. See your dealer, installer
or snowplow manufacture for this information. There are
unique electrical systems that must be connected to
properly assure operator safety and prevent overloading
vehicle systems that would void the vehicle warranty.
WARNING!
Attaching a snowplow to this vehicle could ad-
versely affect performance of the airbag system in an
accident. Do not expect that the airbag will perform
as described earlier in this manual
CAUTION!
The ªLamp Outº indicator could illuminate if exte-
rior lamps are not properly installed.
Before plowing
²
Check the hydraulic system for leaks and proper fluid
level.
²Check the mounting bolts and nuts for proper tight-
ness.
²Check the runners and cutting edge for excessive wear.
The cutting edge should be 1/4 to 1/2 inch (6.4 mm
to13 mm) above ground in snow plowing position.
²Check that snowplow lighting is connected and func-
tioning properly.
Snowplow Model Prep Package Availability
For Detailed Information Visit www.dodge.com or refer
to the 2004 Dodge Truck Body Builders Guide.
1. The 1500 models are NOT available for snowplow
applications.
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