2019 RAM CHASSIS CAB differential

6
 ENGINE BREAK-IN RECOMMENDATIONS ............ 251
 PARKING BRAKE ........................................................... 252
 AUTOMATIC TRANSMISSION .................................... 254 
Ignition Park Interlock ................................................ 255
Brake/Transmission Shift Interlock System ........... 256
Six–Speed Automatic Transmission —
If Equipped .................................................................. 256
Eight-Speed Automatic Transmission .................... 265
 FOUR-WHEEL DRIVE OPERATION —
IF EQUIPPED .................................................................... 272 
Four-Position Electronically Shifted Transfer Case —
If Equipped .................................................................. 272
Manually Shifted Transfer Case — If Equipped ..... 277
 LIMITED-SLIP DIFFERENTIAL .................................... 281
 POWER TAKE OFF OPERATION — IF EQUIPPED
(CHASSIS CAB ONLY) ................................................... 281 
Stationary Mode .......................................................... 282
Mobile Mode ................................................................ 283
 POWER STEERING .......................................................... 283 
Hydraulic Power Steering .......................................... 283  SPEED CONTROL ........................................................... 285 
To Activate.................................................................... 285 
To Set A Desired Speed...............................................286 
To Vary The Speed Setting .........................................286 
To Accelerate For Passing .......................................... 287 
To Resume Speed.........................................................288 
To Deactivate ................................................................288
 ADAPTIVE CRUISE CONTROL (ACC) —
IF EQUIPPED ..................................................................288 
Adaptive Cruise Control (ACC) Operation .............290 
Activating Adaptive Cruise Control (ACC) ............290 
To Activate/Deactivate...............................................291 
To Set A Desired ACC Speed.....................................292 
To Cancel.......................................................................292 
To Turn Off ...................................................................293 
To Resume .................................................................... 293 
To Vary The Speed Setting .........................................293 
Setting The Following Distance In ACC ..................295 
Overtake Aid ................................................................298 
ACC Operation At Stop ..............................................298 
Adaptive Cruise Control (ACC) Menu.....................299 
Display Warnings And Maintenance .......................300 
Precautions While Driving With ACC .....................302

General Information ....................................................306

Normal (Fixed Speed) Cruise Control Mode...........307

166 SAFETY
6. Push the “ESC Off” button located in the lower switch
bank below the climate control four times within 20
seconds. The “ESC Off Indicator Light” should turn on
and turn off two times.
7. Rotate the steering wheel back to center and then an addi -
tional slightly more than one-half turn to the right.
8. Turn the ignition to the OFF mode and then back to ON. If the
sequence was completed properly, the “ESC Off Indicator
Light” will blink several times to confirm HSA is disabled.
9. Repeat these steps if you want to return this feature to its
previous setting.
Traction Control System (TCS)
This system monitors the amount of wheel spin of each of the
driven wheels. If wheel spin is detected, the TCS may apply
brake pressure to the spinning wheel(s) and/or reduce engine
power to provide enhanced acceleration and stability. A
feature of the TCS, Brake Limited Differential (BLD), functions
similar to a limited slip differential and controls the wheel spin
across a driven axle. If one wheel on a driven axle is spinning
faster than the other, the system will apply the brake of the
spinning wheel. This will allow more engine power to be
applied to the wheel that is not spinning. BLD may remain
enabled even if TCS and ESC are in a reduced mode. Electronic Stability Control (ESC)
This system enhances directional control and stability of the
vehicle under various driving conditions. ESC corrects for
oversteering or understeering of the vehicle by applying the
brake of the appropriate wheel(s) to assist in counteracting
the oversteer or understeer condition. Engine power may
also be reduced to help the vehicle maintain the desired path.
ESC uses sensors in the vehicle to determine the vehicle path
intended by the driver and compares it to the actual path of
the vehicle. When the actual path does not match the
intended path, ESC applies the brake of the appropriate
wheel to assist in counteracting the oversteer or understeer
condition.
• Oversteer — when the vehicle is turning more than appro -
priate for the steering wheel position.
• Understeer — when the vehicle is turning less than appro -
priate for the steering wheel position.

STARTING AND OPERATING 281
LIMITED-SLIP DIFFERENTIAL
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 slip -
pery 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 appli -
cation of the parking brake may be necessary to gain
maximum traction. 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 side -
ways on the crowned surface of a road or in a turn.
POWER TAKE OFF OPERATION — IF EQUIPPED
(CHASSIS CAB ONLY)
This vehicle when equipped with PTO Prep and the AS66RC
automatic six-speed, will allow for an aftermarket upfit with
a transmission driven PTO (power take off). The customer
will have the ability to operate the PTO in either a
“stationary” or “mobile” mode. The vehicles will be factory
set to the “stationary” mode. To select “mobile” mode, you
will need to enter the commercial vehicle menu on the instru -
ment cluster screen and select mobile PTO mode. Details of
the PTO selection modes and further PTO information is
available at the Ram Truck Bodybuilders web site:
www.rambodybuilder.com .
AS66RC Six-Speed Automatic Transmission Only
The PTO drive gear (part of the AS66RC) operates at torque
converter turbine speed. The turbine speed will be less than
engine speed when the torque converter clutch is not
engaged and will be same as engine speed when the torque
converter clutch is engaged.WARNING!
On vehicles equipped with a limited-slip differential
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. 5

SERVICING AND MAINTENANCE 443
Drain And Refill
On 4500/5500 vehicles, remove the lower bolt to drain the
axle fluid.
4500/5500 Rear Axle Plugs
Refer to “Scheduled Servicing” in this chapter for the proper
maintenance intervals. Lubricant Selection
Refer to “Fluids And Lubricants” in “Technical Specifica -
tions” for further information.
NOTE:
The presence of water in the gear lubricant will result in
corrosion and possible failure of differential components.
Operation of the vehicle in water, as may be encountered in
some off-highway types of service, will require draining and
refilling the axle to avoid damage.
Limited-Slip Differentials DO REQUIRE limited slip oil
additive (friction modifiers).
NOTE:
Slight noise and mild shuddering may be evident while
turning a vehicle with limited slip differential on concrete or
dry pavement. These conditions should be considered
normal operation of the limited slip differential.1 — 4500/5500 Rear Axle Fluid Fill Plug
2 — 4500/5500 Rear Axle Fluid Drain Plug
7

444 SERVICING AND MAINTENANCE
Transfer Case
Selection Of Lubricant
Use only the manufacturer's recommended fluid. Refer to
“Fluids And Lubricants” in “Technical Specifications” for
further information.
Fluid Level Check
This fluid level can be checked by removing the filler plug.
The fluid level should be to the bottom edge of the filler plug
hole with the vehicle in a level position.
Drain And Refill
Refer to the “Maintenance Plan” in this section for the proper
maintenance intervals. HOISTING
A conventional floor jack may be used at the jacking loca -
tions. Refer to the graphics that show jacking locations.
However, a floor jack or frame hoist must never be used on
any other parts of the underbody.
TIRES
Tire Safety Information
Tire safety information will cover aspects of the following
information: Tire Markings, Tire Identification Numbers,
Tire Terminology and Definitions, Tire Pressures, and Tire
Loading. CAUTION!
Never use a floor jack directly under the differential housing of
a loaded truck or damage to your vehicle may result.

593
Differential, Limited Slip ....................................................... 281
Dipsticks
Power Steering..................................................................... 284
Disabled Vehicle Towing ....................................................... 406
Disposal
Antifreeze (Engine Coolant) .............................................. 436
Do Not Disturb ........................................................................ 579
Door Ajar.................................................................................. 150
Door Ajar Light ....................................................................... 150
Door Locks
Automatic ............................................................................... 37
Doors........................................................................................... 32
Drag And Drop Menu ............................................................ 487
Driver’s Seat Back Tilt .............................................................. 39
Driving
Through Flowing, Rising, Or Shallow Standing Water ....364
Dual Rear Wheels ................................................... 396, 467, 477
E
Electric Brake Control System ............................................... 162
Anti-Lock Brake System ..................................................... 161
Electronic Roll Mitigation .......................................... 166, 170
Electrical Power Outlets......................................................... 117
Electronic Range Select (ERS)........................................ 262, 270
Electronic Stability Control (ESC) ........................................ 166
Electronic Throttle Control Warning Light ......................... 149
Electronically Shifted Transfer Case .................................... 272 Emergency Braking.................................................................252
Emergency, In Case Of
Freeing Vehicle When Stuck ..............................................405
Hazard Warning Flasher ....................................................366
Jacking...................................................................................390
Jump Starting .......................................................................398
Emission Control System Maintenance ...............................159
Engine .......................................................................................415
Air Cleaner ...........................................................................420
Break-In Recommendations...............................................251
Compartment Identification ..............................................415
Coolant (Antifreeze)............................................................ 484
Exhaust Gas Caution................................................... 240, 482
Fails To Start.........................................................................249
Flooded, Starting .................................................................249
Fuel Requirements ..............................................................479
Jump Starting .......................................................................398
Oil ..................................................................................418, 484
Oil Filler Cap ................................................................415, 419
Oil Filter ................................................................................419
Oil Reset ................................................................................130
Oil Selection .........................................................................418
Oil Synthetic .........................................................................419
Overheating..........................................................................401
Starting..................................................................................246
Engine Oil Viscosity................................................................419 11

594
Enhanced Accident Response Feature ......................... 212, 409
Entry System, Illuminated ....................................................... 74
Ethanol...................................................................................... 480
Exhaust Gas Cautions .................................................... 240, 482
Exhaust System ............................................................... 240, 431
Exterior Lighting ....................................................................... 66
Exterior Lights ................................................................... 66, 243
F
Filters
Air Cleaner ........................................................................... 420
Air Conditioning ........................................................... 91, 423
Engine Fuel .......................................................................... 484
Engine Oil..................................................................... 419, 484
Engine Oil Disposal ............................................................ 419
Flashers
Turn Signals ........................................................... 70, 157, 243
Flash-To-Pass ............................................................................. 68
Flat Tire Changing .................................................. 390, 444, 461
Flat Tire Stowage .................................................... 396, 444, 461
Fluid Capacities ....................................................................... 483
Fluid Leaks ............................................................................... 243
Fluid Level Checks
Brake ..................................................................................... 438
Power Steering..................................................................... 284
Fluids And Lubricants ........................................................... 484
Fog Lights........................................................................... 70, 377 Fold Flat Load Floor ...............................................................112
Fold-Flat Seats ...........................................................................39
Forward Collision Warning................................................... 174
Four Wheel Drive .................................................................... 272
Four-Way Hazard Flasher .....................................................366
Freeing A Stuck Vehicle .........................................................405
Front Axle (Differential) .........................................................442
Fuel ............................................................................................479
Adding ..................................................................................336
Additives ..............................................................................480
Clean Air...............................................................................479
Ethanol ..................................................................................480
Filler Cap (Gas Cap)............................................................337
Filter ...................................................................................... 484
Gasoline ................................................................................479
Light ...................................................................................... 152
Materials Added ..................................................................480
Methanol...............................................................................480
Octane Rating.......................................................................479
Requirements .......................................................................479
Tank Capacity ......................................................................483
Fuses..........................................................................................380
G
Garage Door Opener (HomeLink) ..........................................97
Gas Cap (Fuel Filler Cap) .......................................................337
Gasoline, Clean Air .................................................................479

597
Low Fuel ............................................................................... 152
Malfunction Indicator (Check Engine)............................. 150
Park ....................................................................................... 157
Passing .................................................................................... 68
Seat Belt Reminder .............................................................. 146
Security Alarm..................................................................... 148
Service ................................................................................... 371
Traction Control .................................................................. 169
Transfer Case ....................................................................... 280
Turn Signals ................................................... 70, 157, 243, 373
Warning Instrument Cluster Descriptions .............. 148, 157
Limited-Slip Differential ................................................ 281, 443
Load Shed Battery Saver Mode............................................. 144
Load Shed Battery Saver On ................................................. 144
Load Shed Electrical Load Reduction .................................. 144
Load Shed Intelligent Battery Sensor ................................... 144
Loading Vehicle ...................................................................... 337
Tires....................................................................................... 450
Locks
Automatic Door..................................................................... 37
Child Protection .................................................................... 38
Power Door ............................................................................ 33
Low Tire Pressure System ..................................................... 177
Lubrication, Body ................................................................... 428
Lug Nuts/Bolts ....................................................... 396, 476, 477 M
Maintenance Free Battery ......................................................417
Maintenance Schedule............................................................ 410
Malfunction Indicator Light (Check Engine) ..............150, 159
Manual
Park Release .........................................................................403
Service ...................................................................................589
Media Hub ...............................................................................551
Memory Seat ..............................................................................44
Methanol...................................................................................480
Mirrors ........................................................................................56
Electric Powered ....................................................................59
Heated .....................................................................................62
Memory...................................................................................44
Outside....................................................................................58
Rearview .............................................................56, 57, 58, 366
Trailer Towing .......................................................................61
Modifications/Alterations
Vehicle.....................................................................................14
Monitor, Tire Pressure System ..............................................177
Mopar Parts..............................................................................588
MP3 Control ............................................................................. 551
Multi-Function Control Lever .................................................66
N
Navigation System (Uconnect GPS) .....................................326
New Vehicle Break-In Period ................................................251 11