Content .. 492 493 494 495 ..

Jeep Grand Cherokee WJ. Manual - part 494

CONDITION

POSSIBLE CAUSES

CORRECTION

NOISY OPERATION IN
FOURTH GEAR ONLY

1. Overdrive Clutch Discs, Plates
or Snap Rings Damaged.

1. Remove unit and rebuild clutch pack.

2. Overdrive Piston or Planetary
Thrust Bearing Damaged.

2. Remove and disassemble unit. Replace
either thrust bearing if damaged.

3. Output Shaft Bearings
Scored/Damaged.

3. Remove and disassemble unit. Replace
either bearing if damaged.

4. Planetary Gears Worn/Chipped.

4. Remove and overhaul overdrive unit.

5. Overdrive Unit Overrunning
Clutch Rollers Worn/Scored.

5. Remove and overhaul overdrive unit.

SERVICE PROCEDURES

FLUID LEVEL CHECK

Transmission fluid level should be checked monthly

under normal operation. If the vehicle is used for
trailer towing or similar heavy load hauling, check
fluid level and condition weekly. Fluid level is
checked with the engine running at curb idle speed,
the transmission in NEUTRAL and the transmission
fluid at normal operating temperature.

FLUID LEVEL CHECK PROCEDURE

(1) Transmission fluid must be at normal operat-

ing temperature for accurate fluid level check. Drive
vehicle if necessary to bring fluid temperature up to
normal hot operating temperature of 82°C (180°F).

(2) Position vehicle on level surface.
(3) Start and run engine at curb idle speed.
(4) Apply parking brakes.
(5) Shift transmission momentarily into all gear

ranges. Then shift transmission back to Neutral.

(6) Clean top of filler tube and dipstick to keep

dirt from entering tube.

(7) Remove dipstick (Fig. 11) and check fluid level

as follows:

(a) Correct acceptable level is in crosshatch area.
(b) Correct maximum level is to MAX arrow

mark.

t ATF

Plus 3 to restore correct level. Do not overfill.

CAUTION: Do not overfill the transmission. Overfill-
ing may cause leakage out the pump vent which
can be mistaken for a pump seal leak. Overfilling
will also cause fluid aeration and foaming as the
excess fluid is picked up and churned by the gear
train. This will significantly reduce fluid life.

FLUID AND FILTER REPLACEMENT

Refer to the Maintenance Schedules in Group 0,

Lubrication and Maintenance, for proper service
intervals. The service fluid fill after a filter change is
approximately 3.8 liters (4.0 quarts).

REMOVAL

(1) Hoist and support vehicle on safety stands.
(2) Place a large diameter shallow drain pan

beneath the transmission pan.

(3) Remove bolts holding front and sides of pan to

transmission (Fig. 12).

(4) Loosen bolts holding rear of pan to transmis-

sion.

(5) Slowly separate front of pan away from trans-

mission allowing the fluid to drain into drain pan.

(6) Hold up pan and remove remaining bolt hold-

ing pan to transmission.

(7) While holding pan level, lower pan away from

transmission.

(8) Pour remaining fluid in pan into drain pan.
(9) Remove screws holding filter to valve body

(Fig. 13).

(10) Separate filter from valve body and pour fluid

in filter into drain pan.

(11) Dispose of used trans fluid and filter properly.

Fig. 11 Dipstick Fluid Level Marks—Typical

1 – DIPSTICK
2 – MAXIMUM CORRECT FLUID LEVEL
3 – ACCEPTABLE FLUID LEVEL

21 - 26

TRANSMISSION AND TRANSFER CASE

DIAGNOSIS AND TESTING (Continued)

2000 JEEP GRAND CHEROKEE

INSPECTION

Inspect bottom of pan and magnet for excessive

amounts of metal. A light coating of clutch or band
material on the bottom of the pan does not indicate a
problem unless accompanied by slipping condition or
shift lag. If fluid and pan are contaminated with
excessive amounts or debris, refer to the diagnosis
section of this group.

Check the adjustment of the front and rear bands,

adjust if necessary.

CLEANING

(1) Using a suitable solvent, clean pan and mag-

net.

(2) Using a suitable gasket scraper, clean gasket

material from gasket surface of transmission case
and the gasket flange around the pan.

INSTALLATION

(1) Place replacement filter in position on valve

body.

(2) Install screws to hold filter to valve body (Fig.

13). Tighten screws to 4 N·m (35 in. lbs.) torque.

(3) Place new gasket in position on pan and install

pan on transmission.

(4) Place pan in position on transmission.
(5) Install screws to hold pan to transmission (Fig.

12). Tighten bolts to 17 N·m (150 in. lbs.) torque.

(6) Lower

vehicle

and

fill

transmission

with

Mopar

t ATF Plus 3, type 7176 fluid.

TRANSMISSION FILL PROCEDURE

To avoid overfilling transmission after a fluid

change or overhaul, perform the following procedure:

(1) Remove dipstick and insert clean funnel in

transmission fill tube.

(2) Add following initial quantity of Mopar

t ATF

Plus 3 to transmission:

(a) If only fluid and filter were changed, add 6

pints (3 quarts) of ATF Plus 3 to transmission.

(b) If transmission was completely overhauled,

torque converter was replaced or drained, and
cooler was flushed, add 16 pints (8 quarts) of ATF
Plus 3 to transmission.
(3) Apply parking brakes.
(4) Start and run engine at normal curb idle

speed.

(5) Apply

service

brakes,

shift

transmission

through all gear ranges then back to NEUTRAL, set
parking brake, and leave engine running at curb idle
speed.

(6) Remove funnel, insert dipstick and check fluid

level. If level is low, add fluid to bring level to
MIN mark on dipstick. Check to see if the oil level
is equal on both sides of the dipstick. If one side is
noticeable higher than the other, the dipstick has
picked up some oil from the dipstick tube. Allow the
oil to drain down the dipstick tube and re-check.

(7) Drive vehicle until transmission fluid is at nor-

mal operating temperature.

(8) With the engine running at curb idle speed, the

gear selector in NEUTRAL, and the parking brake
applied, check the transmission fluid level.

CAUTION: Do not overfill transmission, fluid leaks,
foaming and shifting problems can result.

Fig. 12 Transmission Pan—Typical

1 – GASKET
2 – PAN
3 – TRANSMISSION

Fig. 13 Transmission Filter—Typical

1 – TRANSMISSION
2 – FILTER

TRANSMISSION AND TRANSFER CASE

21 - 27

SERVICE PROCEDURES (Continued)

2000 JEEP GRAND CHEROKEE

(9) Add fluid to bring level up to MAX arrow

mark.

When fluid level is correct, shut engine off, release

park brake, remove funnel, and install dipstick in fill
tube.

CONVERTER DRAINBACK CHECK VALVE
SERVICE

The converter drainback check valve is located in

the cooler outlet (pressure) line near the radiator
tank. The valve prevents fluid drainback when the
vehicle is parked for lengthy periods. The valve check
ball is spring loaded and has an opening pressure of
approximately 2 psi.

The valve is serviced as an assembly; it is not

repairable. Do not clean the valve if restricted, or
contaminated by sludge, or debris. If the valve fails,
or if a transmission malfunction occurs that gener-
ates significant amounts of sludge and/or clutch par-
ticles

and

metal

shavings,

the

valve

must

replaced.

The valve must be removed whenever the cooler

and lines are reverse flushed. The valve can be flow
tested when necessary. The procedure is exactly the
same as for flow testing a cooler.

If the valve is restricted, installed backwards, or in

the wrong line, it will cause an overheating condition
and possible transmission failure.

CAUTION: The drainback valve is a one-way flow
device. It must be properly oriented in terms of flow
direction for the cooler to function properly. The
valve must be installed in the pressure line. Other-
wise flow will be blocked and would cause an over-
heating condition and eventual transmission failure.

OIL PUMP VOLUME CHECK

After the new or repaired transmission has been

installed, fill to the proper level with Mopar

t ATF

PLUS 3 (Type 7176) automatic transmission fluid.
The volume should be checked using the following
procedure:

(1) Disconnect the cooler outlet line at the rear

of the transmission and place a drainpan under the
disconnected line.

CAUTION: With the fluid set at the proper level,
fluid collection should not exceed (1) quart or inter-
nal damage to the transmission may occur.

(2) Run the engine at curb idle speed, with the

shift selector in neutral.

(3) If fluid flow is intermittent or it takes more

than 20 seconds to collect one quart of ATF PLUS 3,
disconnect the cooler inlet line at the front of the
transmission.

(4) Refill the transmission to the proper level and

recheck pump volume.

(5) If flow is found to be within acceptable limits,

replace the cooler. Then fill transmission to the
proper level, using Mopar

t ATF PLUS 3 (Type 7176)

automatic transmission fluid.

(6) If fluid flow is still found to be inadequate,

check the line pressure using the Transaxle Hydrau-
lic Pressure Test procedure.

FLUSHING COOLERS AND TUBES

When a transmission failure has contaminated the

fluid, the oil cooler(s) must be flushed. The torque
converter must also be replaced. This will insure that
metal particles or sludged oil are not later trans-
ferred back into the reconditioned (or replaced) trans-
mission.

The only recommended procedure for flushing cool-

ers and lines is to use Tool 6906 Cooler Flusher.

WARNING: WEAR PROTECTIVE EYEWEAR THAT
MEETS THE REQUIREMENTS OF OSHA AND ANSI
Z87.1–1968. WEAR STANDARD INDUSTRIAL RUB-
BER GLOVES.

KEEP LIGHTED CIGARETTES, SPARKS, FLAMES,

AND OTHER IGNITION SOURCES AWAY FROM THE
AREA TO PREVENT THE IGNITION OF COMBUSTI-
BLE LIQUIDS AND GASES. KEEP A CLASS (B) FIRE
EXTINGUISHER

THE

AREA

WHERE

THE

FLUSHER WILL BE USED.

KEEP THE AREA WELL VENTILATED.
DO NOT LET FLUSHING SOLVENT COME IN CON-

TACT WITH YOUR EYES OR SKIN: IF EYE CONTAM-
INATION OCCURS, FLUSH EYES WITH WATER FOR
15 TO 20 SECONDS. REMOVE CONTAMINATED
CLOTHING AND WASH AFFECTED SKIN WITH
SOAP AND WATER. SEEK MEDICAL ATTENTION.

COOLER FLUSH USING TOOL 6906

(1) Remove cover plate filler plug on Tool 6906.

Fill reservoir 1/2 to 3/4 full of fresh flushing solution.
Flushing solvents are petroleum based solutions gen-
erally used to clean automatic transmission compo-
nents. DO NOT use solvents containing acids, water,
gasoline, or any other corrosive liquids.

(2) Reinstall filler plug on Tool 6906.
(3) Verify pump power switch is turned OFF. Con-

nect red alligator clip to positive (+) battery post.
Connect black (-) alligator clip to a good ground.

(4) Disconnect the cooler lines at the transmission.

NOTE: When

flushing

transmission

cooler

and

lines, ALWAYS reverse flush.

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TRANSMISSION AND TRANSFER CASE

SERVICE PROCEDURES (Continued)

2000 JEEP GRAND CHEROKEE

NOTE: The converter drainback valve must be
removed and an appropriate replacement hose
installed to bridge the space between the transmis-
sion cooler line and the cooler fitting. Failure to
remove the drainback valve will prevent reverse
flushing the system.

(5) Connect the BLUE pressure line to the OUT-

LET (From) cooler line.

(6) Connect the CLEAR return line to the INLET

(To) cooler line

(7) Turn pump ON for two to three minutes to

flush cooler(s) and lines. Monitor pressure readings
and clear return lines. Pressure readings should sta-
bilize below 20 psi. for vehicles equipped with a sin-
gle cooler and 30 psi. for vehicles equipped with dual
coolers. If flow is intermittent or exceeds these pres-
sures, replace cooler.

(8) Turn pump OFF.
(9) Disconnect CLEAR suction line from reservoir

at cover plate. Disconnect CLEAR return line at
cover plate, and place it in a drain pan.

(10) Turn pump ON for 30 seconds to purge flush-

ing solution from cooler and lines. Turn pump OFF.

(11) Place CLEAR suction line into a one quart

container of Mopar

t ATF Plus 3, type 7176 automatic

transmission fluid.

(12) Turn pump ON until all transmission fluid is

removed from the one quart container and lines. This
purges any residual cleaning solvent from the trans-
mission cooler and lines. Turn pump OFF.

(13) Disconnect alligator clips from battery. Recon-

nect flusher lines to cover plate, and remove flushing
adapters from cooler lines.

ALUMINUM THREAD REPAIR

Damaged or worn threads in the aluminum trans-

mission case and valve body can be repaired by the
use of Heli-Coils, or equivalent. This repair consists
of drilling out the worn-out damaged threads. Then
tap the hole with a special Heli-Coil tap, or equiva-
lent, and installing a Heli-Coil insert, or equivalent,
into the hole. This brings the hole back to its original
thread size.

Heli-Coil, or equivalent, tools and inserts are

readily available from most automotive parts suppli-
ers.

REMOVAL AND INSTALLATION

TRANSMISSION

CAUTION: The transmission and torque converter
must be removed as an assembly to avoid compo-
nent damage. The converter drive plate, pump
bushing, or oil seal can be damaged if the con-
verter is left attached to the driveplate during
removal. Be sure to remove the transmission and
torque converter as an assembly.

REMOVAL

(1) Open the hood and disconnect the negative bat-

tery cable.

(2) Remove the (2) upper fan shroud retaining

bolts.

(3) Remove the transmission dipstick tube support

bracket nut from the turbocharger heatshield (Fig.
14).

(4) Position a drainpan under the transmission.
(5) Pull the transmission dipstick tube from the

transmission housing.

(6) Raise the vehicle on a hoist.
(7) Remove the (2) lower fan shroud retaining

bolts.

Fig. 14 Transmission Dipstick Tube Support Bracket

Position & Orientation

1 – TRANSMISSION DIPSTICK TUBE
2 – TURBOCHARGER EXHAUST MANIFOLD HEATSHIELD
3 – TRANSMISSION DIPSTICK TUBE SUPPORT BRACKET

RETAINING NUT

TRANSMISSION AND TRANSFER CASE

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SERVICE PROCEDURES (Continued)

2000 JEEP GRAND CHEROKEE

Content .. 492 493 494 495 ..