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Jeep Grand Cherokee WJ. Manual - part 914

(15) Using a suitable gauge bar and dial indicator,

measure clutch pack clearance (Fig. 237).

(a) Position gauge bar across the clutch drum

with the dial indicator pointer on the pressure
plate (Fig. 237).

(b) Using two small screw drivers, lift the pres-

sure plate and release it.

snap-ring and record the dial indicator reading.
Clearance should be 0.559 - 0.914 mm (0.022 -

0.036 in.). If clearance is incorrect, steel plates, discs,
selective snap ring and pressure plates may have to
be changed.

The selective snap-ring thicknesses are:
• 0.107-0.109 in.

• 0.098-0.100 in.

• 0.095-0.097 in.

• 0.083-0.085 in.

• 0.076-0.078 in.

• 0.071-0.073 in.

• 0.060-0.062 in.
(16) Coat rear clutch thrust washer with petro-

leum jelly and install washer over input shaft and
into clutch retainer (Fig. 238). Use enough petroleum
jelly to hold washer in place.

REAR SERVO

DESCRIPTION

The rear (low/reverse) servo consists of a single

stage or diameter piston and a spring loaded plug.
The spring is used to cushion the application of the
rear (low/reverse) band.

OPERATION

While in the de-energized state (no pressure

applied), the piston is held up in its bore by the pis-
ton spring. The plug is held down in its bore, in the
piston, by the plug spring. When pressure is applied
to the top of the piston, the plug is forced down in its
bore, taking up any clearance. As the piston moves, it
causes the plug spring to compress, and the piston
moves down over the plug. The piston continues to
move down until it hits the shoulder of the plug and
fully applies the band. The period of time from the
initial application, until the piston is against the
shoulder of the plug, represents a reduced shocking
of the band that cushions the shift.

DISASSEMBLY

(1) Remove small snap-ring and remove plug and

spring from servo piston (Fig. 239).

(2) Remove and discard servo piston seal ring.

Fig. 237 Checking Rear Clutch Pack Clearance

1 - DIAL INDICATOR
2 - PRESSURE PLATE
3 - SNAP-RING
4 - STAND
5 - REAR CLUTCH
6 - GAUGE BAR

Fig. 238 Installing Rear Clutch Thrust Washer

1 - REAR CLUTCH RETAINER
2 - REAR CLUTCH THRUST WASHER

AUTOMATIC - 44RE

21s - 163

REAR CLUTCH (Continued)

2001 JEEP GRAND CHEROKEE

CLEANING

Remove and discard the servo piston seal ring (Fig.

240). Then clean the servo components with solvent
and dry with compressed air. Replace either spring if
collapsed, distorted or broken. Replace the plug and
piston if cracked, bent, or worn. Discard the servo
snap-rings and use new ones at assembly.

ASSEMBLY

(1) Lubricate piston and guide seals (Fig. 241)

with petroleum jelly. Lubricate other servo parts with
Mopar

t ATF +4, type 9602, transmission fluid.

(2) Install new seal ring on servo piston.
(3) Assemble piston, plug, spring and new snap-

ring.

(4) Lubricate piston seal lip with petroleum jelly.

SHIFT MECHANISM

DESCRIPTION

The gear shift mechanism provides six shift posi-

tions which are:

• PARK (P)

• REVERSE (R)

• NEUTRAL (N)

• DRIVE (D)

• Manual SECOND (2)

• Manual LOW (1)

OPERATION

Manual LOW (1) range provides first gear only.

Overrun braking is also provided in this range. Man-
ual SECOND (2) range provides first and second gear
only.

DRIVE range provides first, second third and over-

drive fourth gear ranges. The shift into overdrive
fourth gear range occurs only after the transmission
has completed the shift into D third gear range. No
further movement of the shift mechanism is required
to complete the 3-4 shift.

The fourth gear upshift occurs automatically when

the overdrive selector switch is in the ON position.
No upshift to fourth gear will occur if any of the fol-
lowing are true:

• The transmission fluid temperature is below 10°

C (50° F) or above 121° C (250° F).

• The shift to third is not yet complete.

• Vehicle speed is too low for the 3-4 shift to occur.

• Battery temperature is below -5° C (23° F).

Fig. 239 Rear Servo Components

1 - SNAP-RING
2 - PISTON SEAL
3 - PISTON PLUG
4 - SPRING RETAINER
5 - SNAP-RING
6 - PISTON SPRING
7 - CUSHION SPRING
8 - PISTON

Fig. 240 Rear Servo Components

1 - SNAP-RING
2 - PISTON SEAL
3 - PISTON PLUG
4 - SPRING RETAINER
5 - SNAP-RING
6 - PISTON SPRING
7 - CUSHION SPRING
8 - PISTON

Fig. 241 Rear Servo Components

1 - SNAP-RING
2 - PISTON SEAL
3 - PISTON PLUG
4 - SPRING RETAINER
5 - SNAP-RING
6 - PISTON SPRING
7 - CUSHION SPRING
8 - PISTON

21s - 164

AUTOMATIC - 44RE

REAR SERVO (Continued)

2001 JEEP GRAND CHEROKEE

REMOVAL

(1) Remove any necessary console parts for access to

shift lever assembly and shifter cables. (Refer to 23 -
BODY/INTERIOR/FLOOR CONSOLE - REMOVAL)

(2) Shift transmission into PARK.
(3) Disconnect the transmission shift cable at shift

lever and shifter assembly bracket (Fig. 242).

(4) Disconnect the brake transmission interlock

(BTSI) cable from the shifter BTSI lever and the
shifter assembly bracket. (Fig. 243)

(5) Disconnect the transfer case shift cable from

the transfer case shift lever pin (Fig. 244).

(6) Remove the clip holding the transfer case shift

cable to the shifter assembly bracket.

(7) Remove the transfer case shift cable from the

shifter assembly bracket.

(8) Disengage

all

wiring

connectors

from

the

shifter assembly.

(9) Remove all nuts holding the shifter assembly to

the floor pan (Fig. 245).

(10) Remove the shifter assembly from the vehicle.

INSTALLATION

(1) Install shifter assembly onto the shifter assem-

bly studs on the floor pan.

(2) Install the nuts to hold the shifter assembly

onto the floor pan. Tighten nuts to 28 N·m (250
in.lbs.).

Fig. 242 Transmission Shift Cable

1 - SHIFT LEVER PIN
2 - ADJUSTMENT SCREW
3 - SHIFT CABLE
4 - SHIFTER ASSEMBLY BRACKET

Fig. 243 Brake Transmission Interlock Cable

1 - SHIFT MECHANISM

4 - STEERING COLUMN ASSEMBLY

2 - SHIFTER BTSI LEVER

5 - INTERLOCK CABLE

3 - ADJUSTMENT CLIP

AUTOMATIC - 44RE

21s - 165

SHIFT MECHANISM (Continued)

2001 JEEP GRAND CHEROKEE

(3) Install wiring harness to the shifter assembly

bracket. Engage any wire connectors removed from
the shifter assembly.

(4) Install the transfer case shift cable to the

shifter assembly bracket. Install clip to hold cable to
the bracket.

(5) Snap the transfer case shift cable onto the

transfer case shift lever pin.

(6) Install the brake transmission interlock cable

into the shifter assembly bracket and into the shifter
BTSI lever.(Refer to 21 - TRANSMISSION/TRANS-
AXLE/AUTOMATIC/SHIFT INTERLOCK MECHA-
NISM - ADJUSTMENTS)

(7) Install the shift cable to the shifter assembly

bracket. Push cable into the bracket until secure.

(8) Place the floor shifter lever in park position.
(9) Loosen the adjustment screw on the shift cable.
(10) Snap the shift cable onto the shift lever pin.
(11) Verify that the shift lever is in the PARK posi-

tion.

(12) Tighten the adjustment screw to 7 N·m (65

in.lbs.).

(13) Verify correct shifter operation.
(14) Install any console parts removed for access to

shift lever assembly and shift cables. (Refer to 23 -
BODY/INTERIOR/FLOOR CONSOLE - INSTALLA-
TION)

SOLENOID

DESCRIPTION

The typical electrical solenoid used in automotive

applications is a linear actuator. It is a device that
produces motion in a straight line. This straight line
motion can be either forward or backward in direc-
tion, and short or long distance.

A solenoid is an electromechanical device that uses

a magnetic force to perform work. It consists of a coil
of wire, wrapped around a magnetic core made from
steel or iron, and a spring loaded, movable plunger,
which performs the work, or straight line motion.

The solenoids used in transmission applications

are attached to valves which can be classified as nor-
mally open or normally closed. The normally
open solenoid valve is defined as a valve which
allows hydraulic flow when no current or voltage is
applied to the solenoid. The normally closed sole-
noid valve is defined as a valve which does not allow
hydraulic flow when no current or voltage is applied
to the solenoid. These valves perform hydraulic con-
trol functions for the transmission and must there-
fore be durable and tolerant of dirt particles. For
these reasons, the valves have hardened steel pop-
pets and ball valves. The solenoids operate the valves
directly, which means that the solenoids must have
very high outputs to close the valves against the siz-
able flow areas and line pressures found in current
transmissions. Fast response time is also necessary
to ensure accurate control of the transmission.

The strength of the magnetic field is the primary

force that determines the speed of operation in a par-
ticular solenoid design. A stronger magnetic field will
cause the plunger to move at a greater speed than a
weaker one. There are basically two ways to increase
the force of the magnetic field:

• Increase the amount of current applied to the

coil or

• Increase the number of turns of wire in the coil.

Fig. 244 Transfer Case Shift Cable

1 - CLIP
2 - SHIFTER
3 - TRANSFER CASE SHIFT LEVER PIN
4 - TRANSFER CASE SHIFT CABLE

Fig. 245 Shifter Assembly

1 - FLOOR PAN
2 - SHIFTER ASSEMBLY

21s - 166

AUTOMATIC - 44RE

SHIFT MECHANISM (Continued)

2001 JEEP GRAND CHEROKEE

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