engine DODGE RAM 2500 POWER WAGON 2008 3.G Workshop Manual

reduce the potential for transmission overheating or
failure due to excessive shifting. When operating in
ªTOW HAULº mode, 5th gear (if equipped) is disabled
and 2-3 and 3-4 shift patterns are modified. Shifts into
Overdrive (4th gear) are allowed during steady cruise
(for improved fuel economy) and automatic closed-
throttle downshifts to 3rd gear are performed (for im-
proved braking) when driving conditions warrant. Press-
ing the ªTOW HAUL O/D OFFº button a second time to
select O/D OFF will disable 4th and 5th gear completely,
which should eliminate any excessive transmission shift-
ing.
The ªTOW HAULº or ªO/D OFFº light will illuminate in
the instrument cluster to indicate when the switch has
been activated. Pressing the switch a third time restores
normal operation. If the ªTOW HAULº or ªO/D OFFº
modes are desired, the button must be pressed each time
the engine is started.Torque Converter Clutch
A feature, designed to improve fuel economy, has been
included in the automatic transmission on your vehicle.
A clutch within the torque converter engages automati-
cally at calibrated speeds. This may result in a slightly
different feeling or response during normal operation in
the upper gears. When the vehicle speed drops or during
acceleration when the transmission downshifts to second
gear, the clutch automatically disengages.
NOTE:The torque converter clutch will not engage
until the transmission fluid and engine coolant are warm
[usually after 1-3 miles (1.6 - 4.8 km) of driving]. Because
the engine speed is higher when the torque converter
clutch is not engaged, it may seem as if the transmission
is not shifting into Overdrive when cold. This is normal.
Pressing the ªTOW HAUL O/D OFFº button, when the
transmission is sufficiently warm, will demonstrate that
the transmission is able to shift into and out of overdrive.
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Manual Transmission Ð 6 Speed (G56)
The Power Wagon may be equipped with the G56
manual transmission. This transmission has a ªcreeperº
1st gear which should be used to start from a standing
position when carrying a payload or towing a trailer.
Damage to the clutch can result from starting in 2nd or
3rd gear with a loaded vehicle. An unloaded vehicle may
be launched in 2nd gear. Use each gear in numerical
order ± do not skip a gear.
For most city driving you may find it easier to use only
1st through 5th gear ranges. For steady highway driving
with light accelerations, 6th gear is recommended. To
shift into 5th gear, move the shift lever to the right
beyond the spring pressure point and push it forward.
When shifting from 5th to 4th gear, pull the lever down
toward you in one motion. Do not pull the lever sharply
left as you may shift accidentally into 2nd gear and
damage the transmission.To shift into Reverse, come to a complete stop. Depress
the clutch and pause briefly to allow the gear train to
stop. Reverse has a ªcrash-throughº lockout feature.
Move the shift lever from the Neutral position straight
across, in one swift motion, and down into Reverse.
Recommended Vehicle Shift Speeds
To utilize your manual transmission efficiently for both
fuel economy and performance, it should be upshifted as
listed in recommended shift speed chart. Shift at the
vehicle speeds listed for acceleration. Earlier upshifts
during cruise conditions (steady speeds) will result in
increased fuel economy, and may be used as indicated.
6 Speed Manual Transmission Shift Speeds
Engine 1 to 2 2 to 3 3 to 4 4 to 5 5 to 6
5.7L
Gas
Engine15 mph
(24
km/h)25 mph
(40
km/h)40 mph
(64
km/h)45 mph
(72
km/h)50 mph
(81
km/h)
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Downshifting ± All Manual Transmissions
Moving from a high gear down to a lower gear is
recommended to preserve brakes when driving down
steep hills. In addition, downshifting at the right time
provides better acceleration when you desire to resume
speed. For acceleration at speeds less than 20 mph (30
km/h), 2nd gear is recommended.
CAUTION!
When descending a hill, be very careful to downshift
one gear at a time to prevent overspeeding the engine
which can cause valve damage.
To prevent clutch and transmission damage, your vehicle
should be downshifted at speeds no greater than those
listed in the Maximum Recommended Downshifting
Speed chart.Maximum Recommended Downshifting Speeds
Gear
Selec-
tion1st 2nd 3rd 4th 5th
Maxi-
mum
Speed16 mph
(25
km/h)30 mph
(48
km/h)50 mph
(80
km/h)76 mph
(122
km/h)105
mph
(168
km/h)
CAUTION!
Failure to follow the recommended downshifting
speeds may cause the engine to over speed and / or
damage the clutch disc even if the clutch pedal is
depressed.
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FOUR-WHEEL- DRIVE OPERATION
Manually Shifted Transfer Case Operating
Information/Precautions
The transfer case provides 4 mode positions-2(rear)-
wheel-drive high range, 4-wheel-drive high range, neu-
tral, and 4-wheel-drive low range.
This transfer case is intended to be driven in the 2-wheel-
drive position (2H) for normal street and highway con-
ditions such as dry hard surfaced roads.
When additional traction is required the transfer case 4H
and 4L positions can be used to lock the front and rear
driveshafts together and force the front and rear wheels
to rotate at the same speed. This is accomplished by
simply moving the shift lever to the desired positions.
The 4H and 4L positions are intended for loose, slippery
road surfaces only. Driving in the 4H and 4L positions on
dry hard surfaced roads may cause increased tire wear
and damage to the driveline components.The 4-wheel drive high (4LOCK) and 4±wheel drive low
(4LOW) lights, located in the instrument cluster, alert the
driver that the vehicle is either in 4-wheel drive high or
4±wheel drive low and that the front and rear driveshafts
are locked together. There are no lights for the 2H or N
(Neutral) positions.
When operating your vehicle in 4L, the engine speed is
approximately three times that of the 2H or 4H positions
at a given road speed. Take care not to overspeed the
engine and do not exceed 25 mph (40 km/h).
Proper operation of 4-wheel-drive vehicles depends on
tires of equal size, type and circumference on each wheel.
Any difference will adversely affect shifting and can
cause damage to the transfer case.
NOTE:Do not attempt to make a shift while only the
front or rear wheels are spinning. The transfer case is not
equipped with a synchronizer and therefore the front and
rear driveshaft speeds must be equal for the shift to take
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vehicle in motion, the transfer case will engage / disen-
gage faster if you momentarily release the accelerator
pedal after completing the shift. Apply a constant force
when shifting the transfer case lever.
2H or 4H,4L
With the vehicle rolling at 2 to 3 mph (3 to 5 km/h), shift
an automatic transmission to N (Neutral) or depress the
clutch on a manual transmission. While the vehicle is
coasting at 2 to 3 mph (3 to 5 km/h), shift the transfer
case lever firmly to the desired position. Do not pause in
transfer case N (Neutral).
NOTE:Pausing in transfer case N (Neutral) in vehicles
equipped with an automatic transmission may require
shutting the engine OFF to avoid gear clash while
completing the shift. If difficulty occurs, shift automatic
transmission to N (Neutral), hold foot on brake, and turn
engine OFF. Make shift to the desired mode.NOTE:Shifting into or out of 4L is possible with the
vehicle completely stopped, however difficulty may oc-
cur due to the mating clutch teeth not being properly
aligned. Several attempts may be required for clutch
teeth alignment and shift completion to occur. The pre-
ferred method is with the vehicle rolling 2 to 3 mph (3 to
5 km/h). Avoid attempting to engage or disengage 4L
with the vehicle moving faster than 2 to 3 mph (3 to 5
km/h).
NOTE:Do not attempt to shift to or from 4L while the
transmission is in gear or clutch is engaged.
Transfer Case Reminder Light
The four-wheel-drive operating light (4LOCK), located in
the instrument cluster, is used to alert the driver that the
front axle is fully engaged and all four wheels are
driving.
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LIMITED-SLIP DIFFERENTIAL Ð IF EQUIPPED
The limited-slip differential provides additional traction
on snow, ice, mud, sand and gravel, particularly when
there is a difference between the traction characteristics
of the surface under the right and left rear wheels. During
normal driving and cornering, the limited-slip unit per-
forms similarly to a conventional differential. On slip-
pery surfaces, however, the differential delivers more of
the driving effort to the rear wheel having the better
traction.
The limited-slip differential is especially helpful during
slippery driving conditions. With both rear wheels on a
slippery surface, a slight application of the accelerator
will supply maximum traction. When starting with only
one rear wheel on an excessively slippery surface, slight
momentary application of the parking brake may be
necessary to gain maximum traction.WARNING!
On vehicles equipped with a limited-slip differen-
tial, never run the engine with one rear wheel off the
ground, since the vehicle may drive through the rear
wheel remaining on the ground. You could lose
control of the vehicle.
Care should be taken to avoid sudden accelerations when
both rear wheels are on a slippery surface. This could
cause both rear wheels to spin, and allow the vehicle to
slide sideways on the crowned surface of a road or in a
turn.
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CAUTION!
Never park your vehicle over dry grass or other
combustible materials. The heat from your vehicle
exhaust system could cause a fire.
WARNING!
Always wear your seat belt and firmly tie down
cargo. Unsecured cargo can become projectiles in an
off-road situation.
When To Use Low Range
When driving off-road, shift into 4L (Low range) for
additional traction or to improve handling and control on
slippery or difficult terrain. Due to the lower gearing, low
range will allow the engine to operate in a higher powerrange. This will allow you to idle over obstacles and
down hills, with improved control and less effort. Also,
use 4L (Low range) in rain, ice, snow, mud, sand, to get
heavy loads rolling, improve traction, or whenever 4H
(High range) traction will not do the job.
Driving in Snow, Mud and Sand
There is a drastic reduction in traction when driving in
snow, mud or sand. The vehicle will be less responsive to
steering, acceleration and braking inputs. Therefore you
should accelerate slowly, leave greater stopping distances
and avoid abrupt vehicle maneuvers. You want to keep a
slow constant steady pace. The key is to maintain the
vehicle's momentum.
²Snow± In heavy snow or for additional control and
traction at slower speeds, shift the transmission to a
low gear and shift the transfer case to 4L (Low) if
necessary. Don't shift to a lower gear than necessary to
maintain headway. Over-revving the engine can spin
286 STARTING AND OPERATING

the wheels and traction will be lost. If you start to slow
to a stop, try turning your steering wheel no more than
a
1¤4turn quickly back and forth, while still applying
throttle. This will allow the tires to get a fresh9bite9
and help maintain your momentum.
CAUTION!
On icy or slippery roads, do not downshift at high
engine rpm's or vehicle speeds because engine brak-
ing may cause skidding and loss of control.
²Mud± Deep mud creates a great deal of suction
around the tires and is very difficult to get through.
You should use 4L (low range) with a gear low enough
to maintain your momentum without shifting. If you
start to slow to a stop, try turning your steering wheel
no more than a
1¤4turn quickly back and forth for
additional traction. Mud holes pose an increasedthreat of vehicle damage and getting stuck. They are
normally full of debris from previous vehicles getting
stuck. As a good practice before entering any mud
hole, get out and determine how deep it is, if there are
any hidden obstacles and if the vehicle can be safely
recovered if stuck.
²Sand± Soft sand is very difficult to travel through
with full tire pressure. When crossing soft sandy spots
in a trail maintain your vehicle's momentum and do
not stop. The key to driving in soft sand is to use the
appropriate tire pressure, accelerating slowly, avoid-
ing abrupt maneuvers and maintaining the vehicle's
momentum. If you are going to be driving on large soft
sandy areas or dunes, reduce your tire pressure to a
minimum of 15 psi (103 kPa) to allow for a greater tire
surface area. Reduced tire pressure will drastically
improve your traction and handling, while driving on
the soft sand, but you must return the tires to normal
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a1¤4turn quickly back and forth. This will provide a
fresh9bite9into the surface and will usually provide
enough traction to complete the climb. If you do not
make it to the top, place the vehicle in reverse and
back straight down the grade using engine resistance
along with the vehicle brakes.
WARNING!
Never attempt to climb a hill at an angle or turn
around on a steep grade. Driving across an incline
increases the risk of a roll over, which may result in
severe injury.
²Driving Down Hill± Before driving down a steep hill
you need to determine if it is too steep for a safe
descent. What is the surface traction? Is the grade too
steep to maintain a slow controlled descent? Are there
obstacles? Is it a straight descent? Is there plenty ofdistance at the base of the hill to regain control if the
vehicle descends to fast? If you feel confident in your
ability to proceed then make sure you are in 4L (Low)
with the transmission in 1st gear (manually select 1st
gear on automatic transmissions) and proceed with
caution. Allow engine braking to control the descent
and apply your brakes if necessary, but do not allow
the tires to lock.
WARNING!
Do not descend a steep grade in neutral. Use vehicle
brakes in conjunction with engine braking. Descend-
ing a grade too fast could cause you to lose control
and be seriously injured.
²Driving Across An Incline± If at all possible avoid
driving across an incline. If it is necessary, know your
vehicle's abilities. Driving across an incline places
292 STARTING AND OPERATING

more weight on the down hill wheels, which increases
the possibilities of a down hill slide or roll over. Make
sure the surface has good traction with firm and stable
soils. If possible transverse the incline at an angle
heading slightly up or down.
WARNING!
Driving across an incline increases the risk of a roll
over, which may result in severe injury.
²If You Stall Or Begin To Lose Headway± If you stall
or begin to lose headway while climbing a steep hill,
allow your vehicle to come to a stop and immediately
apply the brake. Restart the engine and shift to R
(Reverse). Back slowly down the hill allowing the
compression braking of the engine and transmission tohelp regulate your speed. If the brakes are required to
control vehicle speed, apply them lightly and avoid
locking or skidding the tires.
WARNING!
If the engine stalls or you lose headway or cannot
make it to the top of a steep hill or grade, never
attempt to turn around. To do so may result in
tipping and rolling the vehicle, which may result in
severe injury. Always back carefully straight down a
hill in R (Reverse) gear. Never back down a hill in N
(Neutral) or with the clutch pedal depressed using
only the vehicle brakes. Never drive diagonally
across a hill, always drive straight up or down.
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