wheel size RAM CHASSIS CAB 2012 User Guide

WARNING! (Continued)• Safety chains must always be used between your
vehicle and trailer. Always connect the chains to
the hook retainers of the vehicle hitch. Cross the
chains under the trailer tongue and allow enough
slack for turning corners.
• Vehicles with trailers should not be parked on a
grade. When parking, apply the parking brake on
the tow vehicle. Put the tow vehicle transmission
in PARK. For four-wheel drive vehicles, make sure
the transfer case is not in NEUTRAL. Always,
block or  chock  the trailer wheels.
• GCWR must not be exceeded.
• Total weight must be distributed between the tow
vehicle and the trailer such that the following four
ratings are not exceeded:
1. GVWR
(Continued) WARNING! (Continued)2. GTW
3. GAWR
4. Trailer tongue weight rating for the trailer hitch
utilized (This requirement may limit the ability to
always achieve the 10% to 15% range of tongue
weight as a percentage of total trailer weight).
Towing Requirements – Tires
• Do not attempt to tow a trailer with less than the full
size spare tire.
• Proper tire inflation pressures are essential to the safe
and satisfactory operation of your vehicle. Refer to
“Tires – General Information” in “Starting and Oper-
ating” for proper tire inflation procedures.
• Check the trailer tires for proper tire inflation pres-
sures before trailer usage.352 STARTING AND OPERATING

2. 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 at 100 miles
(160 km) and after 500 miles (800 km).
It is recommended that wheel stud nuts be kept torqued
to specifications at all times. Torque wheel stud nuts to
specifications at each lubrication interval.
Wheel Nut Torque
All wheel nuts should be tightened occasionally to elimi-
nate the possibility of wheel studs being sheared or the bolt holes in the wheels becoming elongated. This is
especially important during the first few hundred miles/
kilometers of operation to allow the wheel nuts to
become properly set. All nuts should first be firmly
seated against the wheel. The nuts should then be
tightened to recommended torque. Tighten the nuts to
final torque in increments. Progress around the bolt
circle, tightening the nut opposite to the nut just previ-
ously tightened until final torque is achieved. Recom-
mended torques are shown in the following chart.
Disc Wheels TypeNut StudSize Hex Size TorqueFt Lbs TorqueNewton-
Meters
Cone M14 x 1.5 22 mm 120-150 160-200
Flanged M14 x 1.5 22 mm 130-160 190-220
6 WHAT TO DO IN EMERGENCIES 387

8. Reach through the access hole of the wheel house
splash shield and lift the slide lock upward far enough to
disengage it from the lock post on the back of the front
lamp unit housing.
9. Remove the headlamp assembly. Grasp the outboard
edge of the lamp and pull it straight forward to disen-
gage the ball stud from the plastic grommet. 10. Disconnect electrical connectors.
11. Replace bulb(s) as necessary.
CAUTION!• Do not contaminate the bulb glass by touching it
with your fingers or by allowing it to contact other
oily surfaces. Shortened bulb life will result.
• Always use the correct bulb size and type for
replacement. An incorrect bulb size or type may
overheat and cause damage to the lamp, the bulb
socket, or the lamp wiring.
NOTE: There are access covers over both headlamp
bulb access holes in the quad front lamp unit housing (if
equipped). These covers MUST be reinstalled after the
bulb has been replaced.444 MAINTAINING YOUR VEHICLE

Synthetic Engine Oil ...................... 408
System, Remote Starting .................... 26
Tachometer ............................ 189
Temperature Control, Automatic (ATC) ........ 260
Temperature Gauge, Engine Coolant .......... 189
Tether Anchor, Child Restraint ............. 68,73
Text Messaging ......................... 115
Tilt Steering Column ..................... 157
Tip Start .............................. 274
Tire and Loading Information Placard ...... 314,330
Tire Identification Number (TIN) ............. 312
Tire Markings .......................... 309
Tire Safety Information .................... 309
Tires ............................ 81,318,479
Aging (Life of Tires) .................. 328
Air Pressure ........................ 318
Chains ............................ 330
Compact Spare ...................... 325 Dual ........................... 334,384
General Information .................. 318
High Speed ......................... 323
Inflation Pressures .................... 319
Life of Tires ........................ 328
Load Capacity .................... 314,315
Quality Grading ..................... 479
Radial ............................ 324
Replacement ........................ 328
Rotation ........................... 333
Safety .......................... 309,318
Sizes ............................. 310
Snow Tires ......................... 332
Spinning ........................... 327
Steel Carcass Ply ..................... 321
Tread Wear Indicators ................. 327
Wheel Nut Torque .................... 382
Tongue Weight/Trailer Weight .............. 349
Torque Converter Clutch .................. 287496 INDEX