GROUP TAB LOCATOR
Introduction
0Lubrication & Maintenance
2Suspension
3Differential & Driveline
5Brakes
7Cooling
8AAudio/Video
8BChime/Buzzer
8EElectronic Control Modules
8FEngine Systems
8GHeated Systems
8HHorn
8IIgnition Control
8JInstrument Cluster
8LLamps
8NPower Systems
8ORestraints
8PSpeed Control
8QVehicle Theft Security
8RWipers/Washers
8WWiring
9Engine
11Exhaust System
13Frame & Bumpers
14Fuel System
19Steering
21Transmission
22Tires/Wheels
23Body
24Heating & Air Conditioning
25Emissions Control
Component and System Index
Service Manual Comment Forms (Rear of Manual)
DIFFERENTIAL & DRIVELINE
TABLE OF CONTENTS
page page
PROPELLER SHAFT......................1REAR AXLE............................10
PROPELLER SHAFT
TABLE OF CONTENTS
page page
PROPELLER SHAFT
DIAGNOSIS AND TESTING................1
STANDARD PROCEDURE.................3
SPECIFICATIONS........................5
SPECIAL TOOLS........................5
PROPELLER SHAFT
REMOVAL.............................6INSTALLATION..........................6
CENTER BEARING
REMOVAL.............................8
INSTALLATION..........................9
PROPELLER SHAFT
DIAGNOSIS AND TESTING
PROPELLER SHAFT VIBRATION
Out-of-round tires or wheels that are out of bal-
ance, will cause a low frequency vibration.Driveline vibration can be from loose or damaged
engine mounts.
Propeller shaft vibration increases with vehicle
speed. A vibration within a specific speed is not usu-
ally caused by a out of balanced propeller shaft.
Worn universal joints or an incorrect propeller shaft
angle, usually cause such a vibration.
VADIFFERENTIAL & DRIVELINE 3 - 1
REAR AXLE
TABLE OF CONTENTS
page page
REAR AXLE
DESCRIPTION.........................10
OPERATION...........................10
DIAGNOSIS AND TESTING................10
STANDARD PROCEDURE - DRAIN AND FILL . . 11
REMOVAL.............................11
INSTALLATION.........................12
SPECIFICATIONS.......................13
SPECIAL TOOLS.......................14
AXLE SHAFTS
REMOVAL.............................15
INSTALLATION.........................15AXLE BEARINGS/SEALS
REMOVAL.............................17
INSTALLATION.........................17
AXLE SHAFTS - DUAL REAR WHEELS
REMOVAL.............................19
INSTALLATION.........................19
AXLE HUB BEARINGS/SEALS
REMOVAL.............................20
INSTALLATION.........................20
PINION SEAL
REMOVAL.............................22
INSTALLATION.........................22
REAR AXLE
DESCRIPTION
The axle housings consist of a cast iron center sec-
tion with axle tubes extending from either side. The
tubes are pressed into and welded to the differential
housing to form a one-piece axle housing. The SRW
axle has semi-floating axle shafts, DRW has full-
floating axle shafts.
NOTE: Axle seals, axle bearings, pinion seal and
differential cover are the only serviceble compo-
nents. If differential is damaged/noisy the axle must
be replaced.
OPERATION
The axle receives power from the transmission
through the rear propeller shaft. The rear propeller
shaft is connected to the pinion gear which rotates
the differential through the gear mesh with the ring
gear bolted to the differential case. The engine power
is transmitted to the axle shafts through the pinion
mate and side gears. The side gears are splined to
the axle shafts.
DIAGNOSIS AND TESTING
NOTE: Axle seals, axle bearings, pinion seals and
differential cover are the only serviceble compo-
nents. If differential is damaged/noisy the axle must
be replaced.
GEAR NOISE
Axle gear noise can be caused by insufficient lubri-
cant, incorrect backlash, incorrect pinion depth, tooth
contact, worn/damaged gears, or the carrier housing
not having the proper offset and squareness.
Gear noise usually happens at a specific speed
range. The noise can also occur during a specific type
of driving condition. These conditions are accelera-
tion, deceleration, coast, or constant load.
When road testing, first warm-up the axle fluid by
driving the vehicle at least 5 miles and then acceler-
ate the vehicle to the speed range where the noise is
the greatest. Shift out-of-gear and coast through the
peak-noise range. If the noise stops or changes
greatly:
²Check for insufficient lubricant.
²Incorrect ring gear backlash.
²Gear damage.
Differential side gears and pinions can be checked
by turning the vehicle. They usually do not cause
noise during straight-ahead driving when the gears
are unloaded. The side gears are loaded during vehi-
cle turns. A worn pinion shaft can also cause a snap-
ping or a knocking noise.
BEARING NOISE
The axle shaft, differential and pinion bearings can
all produce noise when worn or damaged. Bearing
noise can be either a whining, or a growling sound.
Pinion bearingshave a constant-pitch noise. This
noise changes only with vehicle speed. Pinion bearing
noise will be higher pitched because it rotates at a
faster rate. Drive the vehicle and load the differen-
tial. If bearing noise occurs, the rear pinion bearing
is the source of the noise. If the bearing noise is
3 - 10 REAR AXLEVA
heard during a coast, the front pinion bearing is the
source.
Differential bearings usually produce a low pitch
noise. Differential bearing noise is similar to pinion
bearing noise. The pitch of differential bearing noise
is also constant and varies only with vehicle speed.
Axle shaft bearingsproduce noise and vibration
when worn or damaged. The noise generally changes
when the bearings are loaded. Road test the vehicle.
Turn the vehicle sharply to the left and to the right.
This will load the bearings and change the noise
level. Where axle bearing damage is slight, the noise
is usually not noticeable at speeds above 30 mph.
LOW SPEED KNOCK
Low speed knock is generally caused by a worn
U-joint or by worn side-gear thrust washers. A worn
pinion shaft bore will also cause low speed knock.
VIBRATION
Vibration at the rear of the vehicle is usually
caused by a:
²Damaged drive shaft.
²Missing drive shaft balance weight(s).
²Worn or out-of-balance wheels.
²Loose wheel lug nuts.
²Worn U-joint(s).
²Loose/broken springs.
²Damaged axle shaft bearing(s).
²Loose pinion gear nut.
²Excessive pinion yoke run out.
²Bent axle shaft(s).
Check for loose or damaged front-end components
or engine/transmission mounts. These components
can contribute to what appears to be a rearend vibra-
tion. Do not overlook engine accessories, brackets
and drive belts.
NOTE: All driveline components should be exam-
ined before starting any repair.
DRIVELINE SNAP
A snap or clunk noise when the vehicle is shifted
into gear (or the clutch engaged), can be caused by:
²High engine idle speed.
²Transmission shift operation.
²Loose engine/transmission/transfer case mounts.
²Worn U-joints.
²Loose spring mounts.
²Loose pinion gear nut and yoke.
²Excessive ring gear backlash.
²Excessive side gear to case clearance.
The source of a snap or a clunk noise can be deter-
mined with the assistance of a helper. Raise the vehi-
cle on a hoist with the wheels free to rotate. Instruct
the helper to shift the transmission into gear. Listenfor the noise, a mechanics stethoscope is helpful in
isolating the source of a noise.
STANDARD PROCEDURE - DRAIN AND FILL
NOTE: Drain oil when warm.
(1) Clean area around oil fill plug and drain plug.
(2) Remove oil drain plug and drain oil (Fig. 1).
(3) Install oil drain plug and tighten to N´m 100
(74 ft. lbs.).
(4) Remove oil fill plug and fill housing up to bot-
tom edge of oil fill hole (Fig. 1).
(5) Install oil fill plug and tighten to N´m 100 (74
ft. lbs.).
REMOVAL
(1) Raise and support the vehicle.
(2) Position a suitable lifting device under the axle
and secure axle to device.
(3) Remove wheels and tires.
(4) Unplug wear indicator cable (Fig. 2) and (Fig.
3).
(5) Detach cable connector for brake pad wear
indicator.
(6) Remove ABS sensor and clamp bushing from
mounting bore.
NOTE: The right-hand ABS sensor cable is labeled
at the factory with a white tag.
(7) Remove cable ties from the park brake cables.
Release connection cable of brake pad wear indicator
and ABS sensor cable up to the relay unit of the
parking brake.
(8) Remove brake cables from adjuster.
(9) Remove brake calipers with adapters and lines.
Fig. 1 FILL PLUG
1 - FILL PLUG
2 - DRAIN PLUG
VAREAR AXLE 3 - 11
REAR AXLE (Continued)
TORQUE SPECIFICATIONS
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Drain Plug 100 74 -
Fill Plug 100 74 -
Differential Cover Bolts 65 48 -
Axle Bearing Cap Bolts 72 53 -
Axle Grooved Nut 500 369 -
Axle Shaft Hub Nut 65 48 -
*Hub Inner Nut 300 221 -
Hub Outer Nut 250 184 -
*Follow service procedure for torque sequence.
SPECIAL TOOLS
SPECIAL TOOL CROSS-REFERENCE CHART
MB TOOL #MILLER TOOL
#DESCRIPTION
460-589-15-15-
009276 INSTALLER
741 589 01 15
009278 INSTALLER
741 589 00 35
009277 PLATE
460 589 01 07
009279 WRENCH
N/A 8992FLANGE
PULLER
309 589 01 07
009290 WRENCH
389 589 02 15
009291 INSTALLER
N/A C-3281 WRENCH
INSTALLER 9276
INSTALLER 9278
PLATE 9277
3 - 14 REAR AXLEVA
REAR AXLE (Continued)
INSTALLATION
(1) Connect separate wheel speed sensor cables
with shrink-fit sleeves and shrink-fit tubing (Fig.
3).Only due this step if replacing the sensor.
(2) Install the wheel speed sensor all the way into
the axle tube, the wheel speed sensor will self adjust
when the vehicle is moved (Fig. 3).
(3) Install the rear wheels.
(4) Lower the vehicle.
TONE WHEEL
REMOVAL
(1) Remove the hub/bearing assembly (DRW)
(Refer to 3 - DIFFERENTIAL & DRIVELINE/REAR
AXLE/AXLE BEARINGS - REMOVAL).
(2) Insert a hooked prybar between the hub/bear-
ing and the inside of the tone wheel and pry upwards
slightly and work your way around the tone wheel
until the wheel is loose (Fig. 4).
(3) Remove the tone wheel.
INSTALLATION
(1) Install the tone wheel to the hub/bearing with
a thin bead of silicone around the tone wheel.
(2) Tap the tone wheel down with a soft hammer
until seated.
(3) Install the hub/bearing (DRW) (Refer to 3 -
DIFFERENTIAL & DRIVELINE/REAR AXLE/AXLE
BEARINGS - INSTALLATION).
HCU (HYDRAULIC CONTROL
UNIT)
DESCRIPTION
The HCU consists of a valve body, pump motor, low
pressure accumulators, inlet valves, outlet valves and
noise attenuators.
REMOVAL
NOTE: Store the Hydraulic Control Unit in an
upright position only.
(1) Disconnect the ground cable at the battery.
The ignition switch must be switched to the off
position when disconnecting the battery cable.
(2) Disconnect the multiplug from the control mod-
ule (Fig. 5).
(3) Disconnect the brake lines from the hydraulic
control unit (Fig. 5).Mark the brake lines for
reinstallation, also seal off the connections and
lines to prevent contamination.
(4) Remove the hydraulic control unit from the
bracket (Fig. 5).
(5) Check the rubber mounts on the bracket.
(Replace if necessary) (Fig. 5).
Fig. 4 TONE WHEEL REMOVAL
1 - HOOKED PRYBAR
2 - TONE WHEEL
3 - HUB/BEARING ASSEMBLY
Fig. 5 HYDRAULIC CONTROL UNIT (ABS)
1 - BRAKE LINES
2 - HCU WITH CONTROL MODULE
3 - ABS/ABD CONTROL MODULE MULTIPLUG
4 - RUBBER SUPPORT
VABRAKES - ABS 5 - 31
REAR WHEEL SPEED SENSOR (Continued)
8W-02 COMPONENT INDEX
Component Page
A/C Auxiliary Fan Relay................ 8W-42
A/C Auxiliary Fan..................... 8W-42
A/C Compressor Clutch................. 8W-42
A/C Control Module-Roof................ 8W-42
A/C Fan Switch....................... 8W-42
A/C Switch-Roof...................... 8W-42
Accelerator Pedal Position Sensor......... 8W-30
Air Outlet Temperature Sensor........... 8W-42
Airbag Control Module................. 8W-43
Airbag Squibs........................ 8W-43
Ambient Temperature Sensor............ 8W-42
Ash Receiver Lamp.................... 8W-44
Automatic Temperature Control Module.... 8W-42
Auxiliary Heater Relay................. 8W-42
Auxiliary Heater Switch................ 8W-42
Battery Relay-Auxiliary................ 8W-20
Batteries............................ 8W-20
Beam Select Switch.................... 8W-50
Blower Motors........................ 8W-42
Body Plug Connector................... 8W-11
Boost Pressure Sensor.................. 8W-30
Boost Pressure Solenoid................ 8W-30
Brake Fluid Level Switch............... 8W-35
Brake Lamp Switch.................... 8W-35
Brake Wear Sensors................... 8W-35
Cabin Heater Assembly................. 8W-42
Cabin Heater Control Module............ 8W-42
Camshaft Position Sensor............... 8W-30
Center High Mounted Stop Lamp......... 8W-51
Central Timer Module.................. 8W-45
Cigar Lighter Lamp................... 8W-44
Cigar Lighter......................... 8W-41
Circulation Pump Diode................ 8W-42
Circulation Pump Relay................ 8W-42
Circulation Pump..................... 8W-42
Clockspring....................... 8W-41, 43
Contact Switch Door-Tailgate............ 8W-44
Controller Antilock Brake............... 8W-35
Courtesy Lamps...................... 8W-44
Crankcase Heater..................... 8W-30
Crankshaft Position Sensor.............. 8W-30
Ctel Antenna Connector................ 8W-55
Ctel Connector..................... 8W-47, 55
Cylinder Lock Switch-Driver............. 8W-61
D+ Relay No. 1....................... 8W-10
D+ Relay No. 2....................... 8W-11
Data Link Connector................... 8W-18
Daytime Running Lamp Relays........... 8W-50
Differential Lock Solenoid Valve.......... 8W-31
Dome Lamp.......................... 8W-44
Door Jamb Switches................... 8W-44
Door Lock Motor/Ajar Switch Assemblies . . . 8W-61Component Page
Dosing Pump......................... 8W-42
EGR Valve........................... 8W-30
Engine Control Module................. 8W-30
Engine Control Relay.................. 8W-31
Engine Coolant Level Switch............. 8W-30
Engine Coolant Temperature Sensor....... 8W-30
Engine Oil Sensor..................... 8W-30
Evaporator Temperature Sensor.......... 8W-42
Fan Stage 1 Relay..................... 8W-42
Fog Lamp Relay...................... 8W-50
Fog Lamp Switch..................... 8W-50
Fuel Injectors........................ 8W-30
Fuel Level Sensor..................... 8W-30
Fuel Pressure Sensor.................. 8W-30
Fuel Pressure Solenoid................. 8W-30
Fuel Shutdown Solenoid................ 8W-30
Fuel Temperature Sensor............... 8W-30
Fuses............................ 8W-10, 11
Fuse Blocks.......................... 8W-10
Fuse/Relay Block...................... 8W-11
Fused Ignition Switch Run-Start Relay..... 8W-11
Grounds............................ 8W-70
Generator........................... 8W-20
Glow Plug Control Module.............. 8W-30
Glow Plugs.......................... 8W-30
Hazard Warning Switch................ 8W-52
Headlamp Adjust Switch................ 8W-50
Headlamp Assemblies............... 8W-50, 52
Headlamp Switch..................... 8W-50
Heat Exchanger Connector.............. 8W-42
Heat Exchanger Switch................. 8W-42
Heated Seat Modules.................. 8W-63
Heated Seat Switches.................. 8W-63
Heater Timer-Auxiliary................. 8W-42
Hood Ajar Switch..................... 8W-39
Horn Relay.......................... 8W-41
Horn Switch......................... 8W-41
Horn............................... 8W-41
Ignition Lock Switch................... 8W-40
Ignition Switch....................... 8W-10
Instrument Cluster.................... 8W-40
Instrument Panel Socket................ 8W-40
Intake Air Temperature Sensor........... 8W-30
Interior Lamps....................... 8W-44
Interior Light Switches................. 8W-44
Interior Lighting Connector.............. 8W-44
Intrusion Sensors..................... 8W-39
Kickdown Switch...................... 8W-30
Lamp Relays......................... 8W-50
License Plate Lamps................... 8W-51
Locker Switches...................... 8W-31
Low Fuel Pressure Sensor............... 8W-30
VA8W-02 COMPONENT INDEX 8W - 02 - 1
8W-15 GROUND DISTRIBUTION
Component PageA/C Auxiliary Fan........................8W-15-4
A/C Auxiliary Fan Relay...................8W-15-12
A/C Control Module- Roof..................8W-15-28
A/C Fan Switch........................8W-15-21
A/C Switch- Roof.....................8W-15-24, 28
Airbag Control Module....................8W-15-11
Ash Receiver Lamp......................8W-15-22
Automatic Temperature Control Module.........8W-15-24
Auxiliary Heater Relay....................8W-15-12
Auxiliary Heater Switch...................8W-15-24
Battery..............................8W-15-8
Battery Relay- Auxiliary...................8W-15-11
Battery- Auxiliary.......................8W-15-11
Blower Motor- Front......................8W-15-9
Brake Fluid Level Switch...................8W-15-8
Brake Wear Sensor- Left Front................8W-15-8
Brake Wear Sensor- Left Rear...............8W-15-28
Brake Wear Sensor- Right Front...............8W-15-8
Brake Wear Sensor- Right Rear...............8W-15-28
Cabin Heater Assembly....................8W-15-3
Center High Mounted Stop Lamp..............8W-15-6
Central Timer Module....................8W-15-15
Cigar Lighter..........................8W-15-22
Cigar Lighter Lamp......................8W-15-22
Circulation Pump........................8W-15-9
Circulation Pump Relay...................8W-15-12
Clockspring...........................8W-15-10
Controller Antilock Brake.................8W-15-2, 28
CTEL Connector........................8W-15-21
Cylinder Lock Switch- Driver..............8W-15-7, 10
D+ Relay No. 1.........................8W-15-12
D+ Relay No. 2.........................8W-15-14
Data Link Connector.....................8W-15-10
Daytime Running Lamp Relay- Left Side.........8W-15-13
Daytime Running Lamp Relay- Right Side........8W-15-13
Daytime Running Lamps Relay...............8W-15-13
Differential Lock Solenoid Valve...............8W-15-2
Dome Lamp...........................8W-15-6
Dosing Pump...........................8W-15-2
Engine Control Module.....................8W-15-7
Engine Coolant Level Switch.................8W-15-2
Fan Stage 1 Relay.......................8W-15-11
Fog Lamp Relay........................8W-15-11
Fog Lamp Switch.......................8W-15-22
Fuse Block No. 1........................8W-15-7
Fused Ignition Switch Run-Start Relay..........8W-15-14
G100..............................8W-15-2, 3
G101................................8W-15-4
G102................................8W-15-4
G200.........................8W-15-6, 7, 8, 9, 10
G201...............................8W-15-11
G202.............8W-15-11, 12, 13, 14, 15, 16, 17, 18, 19
G203....................8W-15-20, 21, 22, 23, 24, 25
G300..........................8W-15-26, 27, 28
G301...............................8W-15-28
G302...............................8W-15-28
Glow Plug Control Module..................8W-15-2
Hazard Warning Switch....................8W-15-7
Headlamp Adjust Switch...................8W-15-22
Headlamp Assembly- Left...................8W-15-3
Headlamp Assembly- Right..................8W-15-4
Heat Exchanger Connector.................8W-15-12
Heat Exchanger Switch....................8W-15-24
Heated Seat Switch- Driver.................8W-15-25
Heated Seat Switch- Passenger...............8W-15-25
Heater Timer- Auxiliary...................8W-15-24
Hood Ajar Switch........................8W-15-4
Horn Relay...........................8W-15-11
Horn Switch..........................8W-15-10
Ignition Lock Switch.....................8W-15-10
Instrument Cluster......................8W-15-10
Instrument Panel Socket...................8W-15-20Component PageInterior Lamp No. 1......................8W-15-6
Interior Lamp No. 2......................8W-15-6
Interior Lamp No. 3......................8W-15-6
Interior Lamp No. 4......................8W-15-6
Interior Lamp No. 5......................8W-15-6
Interior Lamp- Middle Front................8W-15-5, 6
Interior Lamp- Middle Rear................8W-15-5, 6
Interior Lamp- Rear No. 2...................8W-15-5
Interior Lamp- Right Side.................8W-15-5, 6
Interior Light Switch.....................8W-15-21
Interior Lighting Connector..................8W-15-6
Intrusion Sensor No. 1.....................8W-15-6
Intrusion Sensor No. 2.....................8W-15-6
Intrusion Sensor No. 3.....................8W-15-6
Lamp Relay- Left.......................8W-15-13
Lamp Relay- Right......................8W-15-13
License Plate Lamp No. 1..................8W-15-27
License Plate Lamp No. 2..................8W-15-27
Locker Switch No. 1......................8W-15-20
Map/Reading Lamp Switch.................8W-15-21
Marker Lamp Connector...................8W-15-17
Marker Lamp No. 1- Left Front...............8W-15-16
Marker Lamp No. 1- Right Front..............8W-15-16
Marker Lamp No. 2- Left Front...............8W-15-16
Marker Lamp No. 2- Right Front..............8W-15-16
Marker Lamp- Left Center..................8W-15-17
Marker Lamp- Left Rear...................8W-15-27
Marker Lamp- Right Center.................8W-15-17
Marker Lamp- Right Rear..................8W-15-27
Master Door Lock Switch..................8W-15-25
Metering Pump.........................8W-15-18
Multi- Function Switch.....................8W-15-7
Optional Equipment Relay..................8W-15-19
Panic Alarm Switch......................8W-15-20
Parking Brake Switch....................8W-15-15
Power Mirror Motor- Driver.................8W-15-23
Power Mirror Motor- Passenger...............8W-15-23
Power Mirror Switch.....................8W-15-23
Power Window Switch- Driver...............8W-15-23
Power Window Switch- Master...............8W-15-23
Radio...............................8W-15-21
Reading Lamp Connector...................8W-15-6
Recirculated Air Solenoid Valve...............8W-15-9
Seat Belt Switch........................8W-15-15
Security System Module...................8W-15-15
Sentry Key Remote Entry Module..............8W-15-7
Shifter Assembly........................8W-15-20
Siren................................8W-15-9
Tail Lamp Assembly- Left..................8W-15-26
Tail Lamp Assembly- Right.................8W-15-26
TCS Switch...........................8W-15-25
Time Delay Relay.......................8W-15-17
Towing/Intrusion Sensor On/Off Switch..........8W-15-22
Trailer Tow Connector....................8W-15-28
Trailer Tow Control Module.................8W-15-19
Transmission Control Module................8W-15-19
Transmission Relay......................8W-15-19
Turn Signal No. 1- Left Front.................8W-15-3
Turn Signal No. 1- Right Front................8W-15-4
Turn Signal No. 2- Left Front.................8W-15-3
Warm Air Auxiliary Heater Assembly...........8W-15-18
Washer Pump Motor- Front..................8W-15-4
Water Cycle Valve........................8W-15-9
Window Defogger Module- Rear..............8W-15-15
Window Defogger Relay- Left Rear.............8W-15-14
Window Defogger Relay- Right Rear............8W-15-14
Window Defogger Switch- Rear...............8W-15-20
Window Defogger- Left Rear.................8W-15-26
Window Defogger- Right Rear................8W-15-26
Wiper Motor- Front.......................8W-15-9
Wiper/Turn Signal/Engine Start Control Module.....8W-15-7
VA8W-15 GROUND DISTRIBUTION 8W - 15 - 1