2019 Ram 1500 4WD

The locking rear axle is controlled by the AXLE LOCKER
button.
Under normal driving conditions, the rear axle should be
unlocked.
During the command to lock the rear axle, the indicator
light will flash until the axle is locked. After the lock
command has been successfully executed, the light will
remain on solid.
Operating in 4WD LOW the locker can be engaged up to
40 mph (64 km/h) and will remain engaged throughout the
4WD LOW speed range.
Operating the locker in 2WD, 4WD AUTO, and 4WD
LOCK/HIGH the locker can be engaged up to 20 mph
(32 km/h). While driving with the locker engaged, if speed
exceeds 25 mph (40 km/h), the locker will automatically
disengage, but will automatically reengage at 20 mph
(32 km/h).
NOTE:Left to right wheel speed difference may be neces-
sary to allow the rear axle to fully lock. If the indicator light
is flashing after selecting the rear axle lock mode, drive the
vehicle in a turn or on loose gravel to expedite the locking
action. The axle locker could become torque locked due to side to
side loads on the rear axle. Driving slowly while turning
the steering wheel from a left hand turn to a right hand
turn or driving in REVERSE for a short distance may be
required to release the torque lock and unlock the axles.
To unlock the rear axle; push the AXLE LOCK button. The
AXLE LOCK indicator light will go out when the rear axle
is unlocked.
LIMITED-SLIP DIFFERENTIAL — 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 performs simi-
larly to a conventional differential. On slippery 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
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STARTING AND OPERATING 335

•Low brake vacuum (e.g. after several brake pedal appli-
cations).
• STOP/START OFF switch is pushed.
• 4WD system is put into 4LO mode.
• The emissions system override is present.
• A STOP/START system error present.
Conditions That Force An Automatic Shift To Park While
In Autostop Mode
The engine will not start automatically and the transmis-
sion will be placed in PARK if:
• The driver door is open and brake pedal released.
• The driver door is open and the driver seat belt is
unbuckled.
• The engine hood has been opened.
• A STOP/START system error present.
The engine may then be restarted by moving the transmis-
sion shift selector out of PARK (e.g. to DRIVE) or, in some
cases, only by a KEY START. The instrument cluster will
display a SHIFT OUT OF PARK message, or a STOP/
START KEY START REQUIRED message, to indicate which
action is required. Refer to “Instrument Cluster Display” in “Getting To Know
Your Instrument Panel” for further information.
To Manually Turn Off The Stop Start System
1. Push the STOP/START Off switch (located near the gear
selector). The light on the switch will illuminate.
2. The STOP/START OFF message will appear in the instrument cluster display. Refer to “Instrument Cluster
Display” in “Getting To Know Your Instrument Panel”
for further information.
STOP/START OFF Switch Below 4x4 Switch
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STARTING AND OPERATING 339

Recreational Towing — Two-Wheel Drive Models
DO NOT flat tow this vehicle. Damage to the drivetrain
will result.
Recreational towing (for two-wheel drive models) is al-
lowedONLY if the rear wheels are OFFthe ground. This
may be accomplished using a tow dolly or vehicle trailer. If
using a tow dolly, follow this procedure:
NOTE: If vehicle is equipped with air suspension, ensure
the vehicle is set to Normal Ride Height.
1. Properly secure the dolly to the tow vehicle, following the dolly manufacturer’s instructions.
2. Drive the rear wheels onto the tow dolly.
3. Apply the parking brake. Place the transmission in PARK.
4. Properly secure the rear wheels to the dolly, following the dolly manufacturer’s instructions.
5. Turn the ignition OFF.
6. Install a suitable clamping device, designed for towing, to secure the front wheels in the straight position.
CAUTION!
Towing with the rear wheels on the ground will cause
severe transmission damage. Damage from improper
towing is not covered under the New Vehicle Limited
Warranty.
Recreational Towing — Four-Wheel Drive Models
NOTE: The transfer case must be shifted into NEUTRAL
(N) for recreational towing. The transmission must be
shifted into PARK for recreational towing. Refer to the
following for the proper transfer case NEUTRAL (N)
shifting procedure for your vehicle.
CAUTION!
• DO NOT dolly tow any 4WD vehicle. Towing with
only one set of wheels on the ground (front or rear)
will cause severe transmission and/or transfer case
damage. Tow with all four wheels either ON the
ground, or OFF the ground (using a vehicle trailer).
• Tow only in the forward direction. Towing this
vehicle backwards can cause severe damage to the
transfer case.
(Continued)
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STARTING AND OPERATING 425

Refer toActive-Level Four Corner Air Suspension System
— If Equipped inStarting And Operating for more
information.
Towing
Condition Wheels
OFF The Ground 2WD Models 4WD Models
Flat Tow NONE If transmission is operable:
•Transmission in NEUTRAL
• 30 mph (48 km/h) max speed
• 30 miles (48 km) maxdistance See instructions in “Recreational Tow-
ing” under “Starting And Operating”
•
Automatic Transmission in PARK
• Transfer Case in NEUTRAL (N)
• To w i n forward direction
Wheel Lift
Or Dolly To w Front
NOT ALLOWED
Rear OK NOT ALLOWED
Flatbed ALL BEST METHOD BEST METHOD
Proper towing or lifting equipment is required to prevent
damage to your vehicle. Use only tow bars and other
equipment designed for this purpose, following equipment
manufacturer ’s instructions. Use of safety chains is man-
datory. Attach a tow bar or other towing device to main
structural members of the vehicle, not to bumpers or
associated brackets. State and local laws regarding vehicles
under tow must be observed. If you must use the accessories (wipers, defrosters, etc.)
while being towed, the ignition must be in the ON/RUN
mode, not the ACC mode.
If the key fob is unavailable or the vehicle’s battery is
discharged, refer to ”Manual Park Release” in this section
for instructions on shifting the transmission out of PARK
for towing.
482 IN CASE OF EMERGENCY

Chassis
ComponentFluid, Lubricant, or Genuine Part
Automatic Transmission
Use only Mopar ZF 8&9 Speed ATF Automatic Transmission
Fluid, or equivalent. Failure to use the correct fluid may
affect the function or performance of your transmission.
Transfer Case – 48-11 Active On-Demand 2–speed Transfer
Case (With 4WD AUTO) We recommend you use MOPAR Transfer Case Lubricant
for Borg Warner 44-44 and 44-45.
Transfer Case – 48-12 Part Time 2–Speed Transfer Case
(Without 4WD AUTO)
We recommend you use MOPAR Transfer Case Lubricant for
Borg Warner 44-45, 44-46, 44-47, 44-48 and Pre 2016 44-44.
Front Axle We recommend you use Mopar GL-5 Synthetic Axle Lubri-
cant SAE 75W-85.
Rear Axle (3.21/3.55) We recommend you use Mopar Synthetic Gear Lubricant
SAE 75W-90 (MS-A0160). Limited-Slip Rear Axles require
the addition of 5 oz. (148 ml) Mopar Limited Slip Additive
(MS-10111).
Rear Axle (3.92) We recommend you use Mopar Synthetic Gear Lubricant
SAE 75W-140 (MS-8985). Limited-Slip Rear Axles require
the addition of 5 oz. (148 ml) Mopar Limited Slip Additive
(MS-10111).
Max Tow Rear Axle (3.92) We Recommend You Use Dana SAE 80W90 Axle Lubricant.
Brake Master Cylinder We recommend you use Mopar DOT 3. If DOT 3 brake
fluid is not available, then DOT 4 is acceptable.
566 TECHNICAL SPECIFICATIONS