2001 CHRYSLER VOYAGER Service Manual

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Page 1601 of 4284

CHRYSLER VOYAGER 2001 Service Manual SPECIFICATIONS
SPECIFICATIONS - PROPELLER SHAFT
TORQUE SPECIFICATIONS
DESCRIPTION N´m Ft. Lbs. In. Lbs.
Bolt, Propeller Shaft Front Flange-to-PTU
Flange30 22 Ð
Bolt, Propeller Shaft Rear Flange-to-

Page 1602 of 4284

CHRYSLER VOYAGER 2001 Service Manual REAR DRIVELINE MODULE
TABLE OF CONTENTS
page page
REAR DRIVELINE MODULE
DESCRIPTION...........................26
OPERATION.............................26
DIAGNOSIS AND TESTING.................27
REAR

REAR DRIVELINE MODULE
TABLE OF CONTENTS
page page
REAR DRIVELINE MODULE
DESCRIPTION...........................26
OPERATION.............................26
DIAGNOSIS AND TESTING.................27
REAR DRIVELINE MODULE NOISE.........27
REAR DRIVELINE MODULE OPERATION....29
REMOVAL..............................29
DISASSEMBLY...........................30
ASSEMBLY.............................32
INSTALLATION...........................36
SPECIFICATIONS........................37
SPECIAL TOOLS.........................37
BI-DIRECTIONAL OVERRUNNING CLUTCH
DESCRIPTION...........................37
OPERATION.............................38
DIFFERENTIAL ASSEMBLY
DESCRIPTION...........................43
OPERATION.............................43FLUID - DIFFERENTIAL ASSEMBLY
STANDARD PROCEDURE..................44
DIFFERENTIAL ASSEMBLY FLUID CHANGE . . 44
FLUID
STANDARD PROCEDURE..................44
OVERRUNNING CLUTCH HOUSING FLUID
CHANGE..............................44
VISCOUS COUPLER
DESCRIPTION...........................45
OPERATION.............................45
TORQUE ARM
REMOVAL..............................47
INSTALLATION...........................47
INPUT FLANGE SEAL
REMOVAL..............................47
INSTALLATION...........................47
OUTPUT FLANGE SEAL
REMOVAL..............................49
INSTALLATION...........................50
REAR DRIVELINE MODULE
DESCRIPTION
The rear driveline module assembly (Fig. 1) con-
sists of four main components:
²Bi-Directional Overrunning Clutch (BOC)
²Viscous Coupling
²Differential Assembly
²Torque Arm
The viscous coupling and bi-directional overrun-
ning clutch are contained within an overrunning
clutch housing, which fastens to the differential
assembly. The overrunning clutch housing and differ-
ential assembly have unique fluid sumps, each
requiring their own type and capacity of fluid. The
overrunning clutch housing requires MopartATF+4
(Automatic Transmission FluidÐType 9602) or equiv-
alent. The differential assembly requires
Driveline module service is limited to the following
components:
²Differential Assembly (serviced only as assem-
bly)
²Viscous Coupling
²Bi-Directional Overrunning Clutch (BOC)
²Overrunning Clutch Housing
²Seals (Input Flange, Output Flange, Overrun-
ning Clutch Housing O-rings)
²Input Flange/Shield²Torque Arm
²Vents
²FastenersOPERATION
The primary benefits of All Wheel Drive are:
²Superior straight line acceleration, and corner-
ing on all surfaces
²Better traction and handling under adverse con-
ditions, resulting in improved hill climbing ability
and safer driving.
The heart of the system is an inter-axle viscous
coupling. The vehicle retains predominantly front-
wheel drive characteristics, but the All Wheel Drive
capability takes effect when the front wheels start to
slip. Under normal level road, straight line driving,
100% of the torque is allocated to the front wheels.
The viscous coupling controls and distributes torque/
power to the rear wheels. The viscous coupling trans-
mits torque to the rear wheels in proportion of the
amount of the slippage at the front wheels. Thais
variable torque distribution is automatic with no
driver inputs required. The coupling is similar to a
multi-plate clutch. It consists of a series of closely
spaced discs, which are alternately connected to the
front and rear drive units. The unit is totally sealed
and partially filled with silicone fluid. There is no
3 - 26 REAR DRIVELINE MODULERS

Page 1603 of 4284

CHRYSLER VOYAGER 2001 Service Manual adjustment, maintenance or fluid checks required
during the life of the unit.
The overrunning clutch allows the rear wheels to
overrun the front wheels during a rapid front wheel
lock braking maneuver

adjustment, maintenance or fluid checks required
during the life of the unit.
The overrunning clutch allows the rear wheels to
overrun the front wheels during a rapid front wheel
lock braking maneuver. The overrunning action pre-
vents any feed-back of front wheel braking torque to
the rear wheels. It also allows the braking system to
control the braking behavior as a two wheel drive
(2WD) vehicle.
The overrunning clutch housing has a separate oil
sump and is filled independently from the differen-
tial. The fill plug is located on the side of the over-
running clutch case. When filling the overrunning
clutch with lubricant use MopartATF+4 (Automatic
Transmission FluidÐType 9602) or equivalent.
The differential assembly contains a conventional
open differential with hypoid ring gear and pinion
gear set. The hypoid gears are lubricated by SAE
80W-90 gear lubricant.DIAGNOSIS AND TESTING - REAR DRIVELINE
MODULE NOISE
Different sources can be the cause of noise that the
rear driveline module assembly is suspected of mak-
ing. Refer to the following causes for noise diagnosis.
DRIVELINE MODULE ASSEMBLY NOISE
The most important part of driveline module ser-
vice is properly identifying the cause of failures and
noise complaints. The cause of most driveline module
failures is relatively easy to identify. The cause of
driveline module noise is more difficult to identify.
If vehicle noise becomes intolerable, an effort
should be made to isolate the noise. Many noises that
are reported as coming from the driveline module
may actually originate at other sources. For example:
Fig. 1 AWD Driveline Module Assembly
1 - TORQUE ARM
2 - INPUT FLANGE
3 - FLANGE NUT
4 - WASHER
5 - SHIELD
6 - VENT
7 - O-RING
8 - WASHER
9 - BI-DIRECTIONAL OVERRUNNING CLUTCH (BOC)
10 - VISCOUS COUPLER11 - SHIM (SELECT)
12 - O-RING
13 - DIFFERENTIAL ASSEMBLY
14 - PLUG-DIFFERENTIAL FILL
15 - PLUG-OVERRUNNING CLUTCH HOUSING DRAIN
16 - SNAP RING
17 - BEARING
18 - OVERRUNING CLUTCH HOUSING
19 - SEAL-INPUT FLANGE
RSREAR DRIVELINE MODULE3-27
REAR DRIVELINE MODULE (Continued)

Page 1604 of 4284

CHRYSLER VOYAGER 2001 Service Manual ²Tires
²Road surfaces
²Wheel bearings
²Engine
²Transmission
²Exhaust
²Propeller shaft (vibration)
²Vehicle body (drumming)
Driveline module noises are normally divided into
two categories: gea

²Tires
²Road surfaces
²Wheel bearings
²Engine
²Transmission
²Exhaust
²Propeller shaft (vibration)
²Vehicle body (drumming)
Driveline module noises are normally divided into
two categories: gear noise or bearing noise. A thor-
ough and careful inspection should be completed to
determine the actual source of the noise before
replacing the driveline module.
The rubber mounting bushings help to dampen-out
driveline module noise when properly installed.
Inspect to confirm that no metal contact exists
between the driveline module case and the body. The
complete isolation of noise to one area requires
expertise and experience. Identifying certain types of
vehicle noise baffles even the most capable techni-
cians. Often such practices as:
²Increase tire inflation pressure to eliminate tire
noise.
²Listen for noise at varying speeds with different
driveline load conditions
²Swerving the vehicle from left to right to detect
wheel bearing noise.
All driveline module assemblies produce noise to a
certain extent. Slight carrier noise that is noticeable
only at certain speeds or isolated situations should be
considered normal. Carrier noise tends to peak at a
variety of vehicle speeds. Noise isNOT ALWAYSan
indication of a problem within the carrier.
TIRE NOISE
Tire noise is often mistaken for driveline module
noise. Tires that are unbalanced, worn unevenly or
are worn in a saw-tooth manner are usually noisy.
They often produce a noise that appears to originate
in the driveline module.
Tire noise changes with different road surfaces, but
driveline module noise does not. Inflate all four tires
with approximately 20 psi (138 kPa) more than the
recommended inflation pressure (for test purposes
only). This will alter noise caused by tires, but will
not affect noise caused by the differential. Rear axle
noise usually ceases when coasting at speeds less
than 30 mph (48 km/h); however, tire noise contin-
ues, but at a lower frequency, as the speed is
reduced.
After test has been completed lower tire pressure
back to recommended pressure.
GEAR NOISE (DRIVE PINION AND RING GEAR)
Abnormal gear noise is rare and is usually caused
by scoring on the ring gear and drive pinion. Scoringis the result of insufficient or incorrect lubricant in
the carrier housing.
Abnormal gear noise can be easily recognized. It
produces a cycling tone that will be very pronounced
within a given speed range. The noise can occur dur-
ing one or more of the following drive conditions:
²Drive
²Road load
²Float
²Coast
Abnormal gear noise usually tends to peak within
a narrow vehicle speed range or ranges. It is usually
more pronounced between 30 to 40 mph (48 to 64
km/h) and 50 to 60 mph (80 to 96 km/h). When objec-
tionable gear noise occurs, note the driving condi-
tions and the speed range.
BEARING NOISE (DRIVE PINION AND
DIFFERENTIAL)
Defective bearings produce a rough growl that is
constant in pitch and varies with the speed of vehi-
cle. Being aware of this will enable a technician to
separate bearing noise from gear noise.
Drive pinion bearing noise that results from defec-
tive or damaged bearings can usually be identified by
its constant, rough sound. Drive pinion front bearing
is usually more pronounced during a coast condition.
Drive pinion rear bearing noise is more pronounced
during a drive condition. The drive pinion bearings
are rotating at a higher rate of speed than either the
differential side bearings or the axle shaft bearing.
Differential side bearing noise will usually produce
a constant, rough sound. The sound is much lower in
frequency than the noise caused by drive pinion bear-
ings.
Bearing noise can best be detected by road testing
the vehicle on a smooth road (black top). However, it
is easy to mistake tire noise for bearing noise. If a
doubt exists, the tire treads should be examined for
irregularities that often causes a noise that resem-
bles bearing noise.
ENGINE AND TRANSMISSION NOISE
Sometimes noise that appears to be in the driv-
eline module assembly is actually caused by the
engine or the transmission. To identify the true
source of the noise, note the approximate vehicle
speed and/or RPM when the noise is most noticeable.
Stop the vehicle next to a flat brick or cement wall
(this will help reflect the sound). Place the transaxle
inNEUTRAL. Accelerate the engine slowly up
through the engine speed that matches the vehicle
speed noted when the noise occurred. If the same
noise is produced, it usually indicates that the noise
is being caused by the engine or transaxle.
3 - 28 REAR DRIVELINE MODULERS
REAR DRIVELINE MODULE (Continued)

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CHRYSLER VOYAGER 2001 Service Manual DIAGNOSIS AND TESTING - REAR DRIVELINE
MODULE OPERATION
Driveline module operation requires relatively
straight-forward diagnosis. Refer to the following
chart:
DRIVELINE MODULE DIAGNOSIS CHART
CONDIT

Page 1606 of 4284

CHRYSLER VOYAGER 2001 Service Manual DISASSEMBLY
WARNING: Differential is only to be serviced as an
assembly, and no disassembly is required.
(1) Remove six torque arm-to-differential case
bolts and remove torque arm assembly (Fig. 4).
(

Page 1607 of 4284

CHRYSLER VOYAGER 2001 Service Manual (9) Remove overrunning clutch assembly from vis-
cous coupler (Fig. 9).
(10) Remove viscous coupler from differential pin-
ion shaft (Fig. 10).
(11) Remove shim (select) from differential pinion
gear

Page 1608 of 4284

CHRYSLER VOYAGER 2001 Service Manual ASSEMBLY
(1) Install output flange seals using tools C4171
and 8493 (Fig. 15).
(2) Install large overrunning clutch housing o-ring
to differential assembly (Fig. 14).
(3) Install shim to differential

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