2021 RAM CHASSIS CAB tires

424SERVICING AND MAINTENANCE
(Continued)
TIRE ROTATION RECOMMENDATIONS
Tires on the front and rear axles of vehicles
operate at different loads and perform different
steering, driving, and braking functions.
For these reasons, they wear at unequal rates.
These effects can be reduced by timely rotation
of tires. The benefits of rotation are especially
worthwhile with aggressive tread designs such
as those on On/Off Road type tires. Rotation will
increase tread life, help to maintain mud, snow,
and wet traction levels, and contribute to a
smooth, quiet ride.
For the proper maintenance intervals

Ú
page 354.
More frequent rotation is permissible if desired.
The reasons for any rapid or unusual wear should be
corrected prior to rotation being performed.

Tire Rotation (Rearward Cross)

NOTE:
On Canadian vehicles only, if your vehicle is
equipped with All-Season type tires on the front
and On/Off Road type tires mounted on the
rear, do not use a front to back rotation pattern.
Instead, rotate your tires side to side at the
recommended intervals.
CAUTION!
To avoid damage to your vehicle or tires,
observe the following precautions:
Because of restricted traction device clear -
ance between tires and other suspension
components, it is important that only trac-
tion devices in good condition are used.
Broken devices can cause serious damage.
Stop the vehicle immediately if noise
occurs that could indicate device breakage.
Remove the damaged parts of the device
before further use.
Install device as tightly as possible and
then retighten after driving about 0.5 mile
(0.8 km). Autosock devices do not require
retightening.
Do not exceed 30 mph (48 km/h).
Drive cautiously and avoid severe turns and
large bumps, especially with a loaded
vehicle.
Do not drive for a prolonged period on dry
pavement.
Observe the traction device manufacturer’s
instructions on the method of installation,
operating speed, and conditions for use.
Always use the suggested operating speed
of the device manufacturer’s if it is less
than 30 mph (48 km/h).
Do not use traction devices on a compact
spare tire.
CAUTION! (Continued)

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SERVICING AND MAINTENANCE425
(Continued)
Dual Rear Wheels

Tire Rotation

The tires used on dual wheel assemblies should
be matched for wear to prevent overloading one
tire in a set. To check if tires are even, lay a
straight edge across all four tires. The straight
edge should touch all the tires.
NOTE:
If your vehicle is equipped with a Tire Pressure
Information System (TPIS):
The Tire Pressure Information System (TPIS)
uses unique sensors in the inner rear wheels
to help identify them from the outer rear
wheels, because of this, the inner and outer
wheel locations can’t be switched.

After a tire rotation is completed, as shown
below, the system can auto learn the locations
of each sensor ID. Auto learning/localization
occurs when the vehicle ignition status is
changed from Off to On and speeds of greater
than 5 mph (8 km/h) are obtained and remain
over 5 mph (8 km/h) for at about a 15 minute
period. You may need to drive for 20 minutes
to account slower speeds and stops.

If the tires are rotated incorrectly, the Auto
localization of the TPIS sensors will fail to
locate correctly resulting in incorrect loca -
tions for the pressure values displayed in the
Instrument Cluster.
DEPARTMENT OF TRANSPORTATION
UNIFORM TIRE QUALITY GRADES
The following tire grading categories
were established by the National
Highway Traffic Safety Administration.
The specific grade rating assigned by the
tire's manufacturer in each category is
shown on the sidewall of the tires on
your vehicle.
CAUTION!
4500/5500 Dual Rear Tires may only have
one approved direction of rotation. This is
to accommodate the asymmetrical design
(tread pattern) of the On/Off road tire.
When replacing a flat, the spare tire may
have to be remounted on the rim or
installed at a different location to maintain
the correct placement of the tire on the
wheel relative to the tire/wheel position on
the vehicle. For example, if the spare is
used to replace an outer rear tire it will have
to be remounted on the rim so that the
wheel is dished inward. That way the tread
design of asymmetrical tires will maintain
proper position.
CAUTION! (Continued)
8

21_DPF_OM_EN_USC_t.book Page 425

426SERVICING AND MAINTENANCE
All passenger vehicle tires must conform
to Federal safety requirements in
addition to these grades.
TREADWEAR
The Treadwear grade is a comparative
rating, based on the wear rate of the tire
when tested under controlled conditions
on a specified government test course.
For example, a tire graded 150 would
wear one and one-half times as well
on the government course as a tire
graded 100. The relative performance
of tires depends upon the actual
conditions of their use, however, and
may depart significantly from the norm
due to variations in driving habits,
service practices, and differences in
road characteristics and climate.
TRACTION GRADES
The Traction grades, from highest to
lowest, are AA, A, B, and C. These grades
represent the tire's ability to stop on
wet pavement, as measured under
controlled conditions on specified
government test surfaces of asphalt
and concrete. A tire marked C may
have poor traction performance.
TEMPERATURE GRADES
The Temperature grades are A (the
highest), B, and C, representing the tire's
resistance to the generation of heat and
its ability to dissipate heat, when tested
under controlled conditions on a
specified indoor laboratory test wheel.
Sustained high temperature can cause
the material of the tire to degenerate
and reduce tire life, and excessive
temperature can lead to sudden tire
failure. The grade C corresponds to a level
of performance, which all passenger
vehicle tires must meet under the Federal
Motor Vehicle Safety Standard No. 109.
Grades B and A represent higher levels of
performance on the laboratory test wheel,
than the minimum required by law.

WARNING!
The traction grade assigned to this tire is
based on straight-ahead braking traction
tests, and does not include acceleration,
cornering, hydroplaning, or peak traction
characteristics.WARNING!
The temperature grade for this tire is
established for a tire that is properly inflated
and not overloaded. Excessive speed,
under-inflation, or excessive loading, either
separately or in combination, can cause heat
buildup and possible tire failure.

21_DPF_OM_EN_USC_t.book Page 426

432TECHNICAL SPECIFICATIONS
WHEEL AND TIRE TORQUE SPECIFICATIONS

Proper lug nut/bolt torque is very important to
ensure that the wheel is properly mounted to the
vehicle. Any time a wheel has been removed and
reinstalled on the vehicle, the lug nuts/bolts
should be torqued using a properly calibrated
torque wrench using a six sided (hex) deep wall
socket.

TORQUE SPECIFICATIONS
**Use only authorized dealer recommended
lug nuts/bolts and clean or remove any dirt or
oil before tightening. Inspect the wheel mounting surface prior to
mounting the tire and remove any corrosion or
loose particles.
NOTE:
Dual wheels are flat mounted, center piloted.
The lug nuts are a two-piece assembly. When
the tires are being rotated or replaced, clean
these lug nuts and add two drops of oil at the
interface between the hex and the washer.
Ensure that the socket is fully engaged on the
lug nut/bolt (do not insert it half way).

Oil Interface Location
Do not oil wheel studs. For chrome wheels, do
not substitute with chrome plated wheel nuts.

Wheel Mounting Surface

Retighten the wheel nuts in the same sequence
to the torques listed in the table. Go through the
sequence a second time to verify that specific
torque has been achieved. Retighten to
specifications after 25 miles (40 km) and check
the lug nut/bolt torque to be sure that all the lug
nuts/bolts are properly tightened.

Lug Nut/Bolt
Torque
Lug
Nut/Bolt
Type**Lug
Nut/Bolt
Size Lug Nut/
Bolt
Socket
Size
120-150
Ft-Lbs
(160-200 N·m) Cone
M14 x
1.50 22 mm
130-160
Ft-Lbs
(190-220 N·m) Flanged

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450
INDEX
 Pair (Link) Uconnect Phone To A Mobile
Phone............................................................ 260 WARRANTY INFORMATION...................... 447
A
Adaptive Cruise Control (ACC)
(Cruise Control)
.................................... 164, 166Adding Engine Coolant (Antifreeze)............... 384Adding Fuel.................................................... 196Additives, Fuel............................................... 434Adjust Down........................................................... 35Forward....................................................... 35Rearward..................................................... 35Up................................................................ 35Adjustable Pedals............................................ 40Advance Phone Connectivity......................... 266Air BagAir Bag Operation...................................... 305Air Bag Warning Light................................ 303Enhanced Accident Response......... 310, 352Event Data Recorder (EDR)....................... 352If Deployment Occurs................................ 309Knee Impact Bolsters................................ 305Maintaining Your Air Bag System.............. 311Maintenance............................................. 311
Redundant Air Bag Warning Light............. 303Transporting Pets..................................... 330Air Bag Light................................ 107, 303, 331Air Cleaner, Engine (Engine Air Cleaner
Filter)................................................... 369, 391Air Conditioner Maintenance........................ 371Air Conditioner Refrigerant.................. 371, 372Air Conditioner System................................. 371Air Conditioning................................................ 62Air Conditioning Filter....................................... 65Air Conditioning System................................... 64Air Conditioning, Operating Tips....................... 65Air Filter........................................................ 369Air PressureTires......................................................... 415AlarmSecurity Alarm....................................23, 108Alterations/ModificationsVehicle......................................................... 10Antifreeze (Engine Coolant).......................... 384Capacities................................................. 439Disposal................................................... 385Anti-Lock Brake System (ABS)...................... 273Anti-Lock Warning Light................................ 113Assist, Hill Start............................................. 280Audio Settings............................................... 253Audio Systems (Radio).................................. 220
Auto Down Power Windows..............................77Automatic Door Locks......................................28Automatic Headlights.......................................52Automatic Temperature Control (ATC)..............64Automatic Transmission....................... 141, 389Adding Fluid.............................................. 389Fluid And Filter Change............................. 389Fluid Change............................................. 389Fluid Level Check............................. 387, 388Fluid Type........................................ 390, 444Shifting..................................................... 146Special Additives...................................... 387Automatic Transmission Limp Home Mode... 145AutoPark....................................................... 120AUX Camera......................................... 188, 194Auxiliary Driving Systems.............................. 281Axle Fluid.....................................390, 391, 444Axle Lubrication................................... 390, 391
B
Back-Up......................................................... 186Back-Up Camera........................................... 186Battery................................................. 108, 366Blanket..................................................... 130Charging System Light.............................. 108Keyless Key Fob Replacement....................16Battery Saver Feature......................................54

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454 J
Jack Location
................................................. 339Jack Operation............................................... 339Jacking And Tire Changing............................. 339Jump Starting................................................ 344
K
Key Fob Programming Additional Key Fobs
.............. 17Key Fob Battery Service (Remote
Keyless Entry).................................................. 16Key Fob Programming (Remote
Keyless Entry).................................................. 17Keyless Enter-N-Go........................26, 118, 123Passive Entry............................................... 26Keys................................................................. 15
L
Lane Change And Turn Signals........................ 54Lane Change Assist......................................... 54LaneSense.................................................... 183Latches.......................................................... 332Hood........................................................... 79Lead Free Gasoline........................................ 433Leaks, Fluid................................................... 332Life Of Tires................................................... 417Light Bulbs........................................... 332, 401
Lights............................................................ 332Air Bag.................................... 107, 303, 331Automatic High Beam.................................. 52Brake Assist Warning............................... 277Brake Warning.......................................... 107Bulb Replacement.................................... 401Cab Top Clearance................................... 405Cargo........................................................... 54Center Mounted Stop............................... 405Courtesy/Reading....................................... 55Cruise....................................................... 115Daytime Running......................................... 51Electronic Stability Program(ESP) Indicator............................................... 108Exterior...............................................50, 332Fog........................................................... 404Four Wheel Drive Indicator....................... 162Hazard Warning Flasher........................... 334Headlights............................................ 50, 52High Beam................................................... 51Hill Descent Control Indicator................... 278Illuminated Entry......................................... 56Interior......................................................... 55Lights On Reminder..................................... 53Low Fuel................................................... 111Malfunction Indicator (Check Engine)....... 110Park.......................................................... 115Passing........................................................ 52
Seat Belt Reminder.................................. 107Security Alarm.......................................... 108Service...................................................... 401Traction Control........................................ 277Transfer Case........................................... 162Turn Signals..................... 54, 115, 332, 402Warning Instrument Cluster Descriptions................................ 108, 115Limited-Slip Differential....................... 162, 391Load Shed Battery Saver Mode..................... 105Load Shed Battery Saver On......................... 105Load Shed Electrical Load Reduction........... 105Load Shed Intelligent Battery Sensor............ 105Loading Vehicle............................................. 199Tires.......................................................... 411LocksAutomatic Door............................................28Child Protection...........................................28Power Door..................................................25Low Tire Pressure System............................. 284Lubrication, Body.......................................... 380Lug Nuts/Bolts..................................... 342, 432
M
Maintenance Free Battery............................ 366Maintenance Plan......................................... 359Maintenance Schedule............... 353, 357, 359Malfunction Indicator Light (Check Engine).. 110

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456 Power Steering Fluid
...................................... 444Pregnant Women And Seat Belts...................300Preparation For Jacking................................. 339Presets.......................................................... 253PTO (Power Take-Off)..................................... 163
R
Radial Ply Tires.............................................. 416Radiator Cap (Coolant Pressure Cap).. 384, 385Radio Presets...................................................... 253Radio Controls............................................... 247Radio Mode................................................... 247Radio Operation.................................. 247, 269Radio Remote Controls.................................. 247Rain Sensitive Wiper System........................... 58Rear Axle (Differential)......................... 390, 391Rear Camera................................................. 189Rear ParkSense System................................ 177Rear Window, Sliding....................................... 78Recreational Towing...................................... 214Shifting Into Transfer Case Neutral (N)..... 216Shifting Out Of Transfer Case Neutral (N).. 217Reformulated Gasoline.................................. 433Refrigerant.................................................... 372Release, Hood................................................. 79Reminder, Seat Belt...................................... 294Remote Keyless Entry...................................... 15Programming Additional Key Fobs.............. 17Remote Sound System (Radio) Control......... 247
Remote Start (Diesel)...................................... 22Remote Start (Gasoline).................................. 20Remote StartingExit Remote Start Mode.............................. 21Replacement Bulbs...................................... 401Replacement Tires........................................ 417Reporting Safety Defects.............................. 447Resetting Perform Service Indicator............. 358Restraints, Child........................................... 312Restraints, Head.............................................. 38Rotation, Tires.............................................. 424
S
Safety........................................................... 246Safety Checks Inside Vehicle........................ 330Safety Checks Outside Vehicle..................... 332Safety Defects, Reporting............................. 447Safety Features............................................. 246Safety Information, Tire................................ 406Safety Tips.................................................... 330Safety, Exhaust Gas...................................... 333Satellite Radio.............................................. 249Saved Radio Stations................................... 253Schedule, Maintenance................................ 353Seat BeltAutomatic Locking Retractor (ALR)........... 301Seat Belt Reminder....................................... 107Seat Belts............................................ 293, 330Adjustable Shoulder Belt.......................... 297
Adjustable Upper Shoulder Anchorage..... 297Adjustable Upper Shoulder Belt Anchorage............................................ 297Child Restraints........................................ 312Extender................................................... 299Front Seat........................................ 293, 296Inspection................................................. 330Lap/Shoulder Belt Operation.................... 296Lap/Shoulder Belt Untwisting................... 297Operating Instructions.............................. 296Pregnant Women...................................... 300Reminder.................................................. 294Seat Belt Extender.................................... 299Seat Belt Reminder.................................. 294Untwisting Procedure................................ 297Seat Belts Maintenance................................ 429Seats.................................................. 33, 34, 35Adjustment...........................................33, 35Easy Entry....................................................36Folding Floor................................................70Head Restraints...........................................38Memory.......................................................32Power...........................................................35Rear Folding................................................33Tilting...........................................................33Security Alarm........................................ 23, 108Selection Of Coolant (Antifreeze).................. 440Sentry Key (Immobilizer)..................................17Service Assistance........................................ 445Service Contract............................................ 446

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457
Service Manuals
............................................ 448Settings, Audio.............................................. 253Shift Lever Override....................................... 347Shifting.......................................................... 140Automatic Transmission.................. 141, 146Transfer Case............................................ 161Transfer Case, Shifting Into Transfer Case Neutral (N)................................... 216Transfer Case, Shifting Out Of Transfer Case Neutral (N)................................... 217Signals, Turn..................................54, 115, 332Sirius Satellite Radio..................................... 249Favorites................................................... 252Replay....................................................... 251SiriusXM Satellite RadioBrowse in SXM.......................................... 252Favorites................................................... 252Replay....................................................... 251Sliding Rear Window, Power............................ 78Snow Chains (Tire Chains)............................. 422Snow Plow..................................................... 212Snow Tires..................................................... 419Spare Tires................................. 419, 420, 421Spark Plugs................................................... 440Speed ControlAccel/Decel............................................... 165Cancel....................................................... 165Resume..................................................... 165
Speed Control (Cruise Control)............ 164, 166Starting....................................... 118, 119, 122Automatic Transmission.................. 118, 123Button......................................................... 18Cold Weather............................................ 122Engine Block Heater................................. 125Engine Fails To Start................................. 121Starting And Operating.................................. 119Starting Procedures............................. 119, 122Starting Procedures (Diesel Engines)........... 122Starting Procedures (Gas Engines)............... 118SteeringPower....................................................... 163Tilt Column.................................................. 29Wheel, Heated............................................. 29Wheel, Tilt.................................................... 29Steering Wheel Audio Controls..................... 247Steering Wheel Mounted Sound System...... 247Storage............................................................ 66Storage Compartment, Center Seat................. 67Storage, Vehicle......................................65, 427Store Radio Presets...................................... 253Storing Your Vehicle...................................... 427Sunglasses Storage......................................... 69Sway Control, Trailer..................................... 281Synthetic Engine Oil...................................... 368
T
Telescoping Steering Column...........................29Temperature Control, Automatic (ATC).............64TiltDown...........................................................35Up................................................................35Tilt Steering Column.........................................29Tip Start............................................... 118, 123Tire And Loading Information Placard........... 411Tire Markings................................................ 406Tire Safety Information.................................. 406Tires.................................. 332, 414, 419, 425Aging (Life Of Tires)................................... 417Air Pressure.............................................. 414Chains...................................................... 422Changing.................................................. 339Compact Spare......................................... 419Dual........................................342, 425, 432General Information........................ 414, 419High Speed............................................... 415Inflation Pressure..................................... 415Jacking...................................................... 339Life Of Tires.............................................. 417Load Capacity........................................... 411Pressure Monitoring System (TPMS)......................................... 111, 284Quality Grading......................................... 425Radial....................................................... 416Replacement............................................ 417
11

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