Jeep Wrangler TJ. Manual — part 505
UNDERDRIVE CLUTCH
The underdrive clutch is hydraulically applied in
first, second, and third (direct) gears by pressurized
fluid against the underdrive piston. When the under-
drive clutch is applied, the underdrive hub drives the
rear sun gear.
OVERDRIVE CLUTCH
The overdrive clutch is hydraulically applied in
third (direct) and overdrive gears by pressurized fluid
against the overdrive/reverse piston. When the over-
drive clutch is applied, the overdrive hub drives the
front planet carrier.
REVERSE CLUTCH
The reverse clutch is hydraulically applied in
reverse gear only by pressurized fluid against the
overdrive/reverse piston. When the reverse clutch is
applied, the front sun gear assembly is driven.
FLUID AND FILTER
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - CAUSES OF
BURNT FLUID
Burnt, discolored fluid is a result of overheating
which has two primary causes.
(1) A result of restricted fluid flow through the
main and/or auxiliary cooler. This condition is usu-
ally the result of a damaged main cooler, or severe
restrictions in the coolers and lines caused by debris
or kinked lines.
(2) Heavy duty operation with a vehicle not prop-
erly equipped for this type of operation. Trailer tow-
ing or similar high load operation will overheat the
transmission
fluid
if
the
vehicle
is
improperly
equipped. Such vehicles should have an auxiliary
transmission fluid cooler, a heavy duty cooling sys-
tem, and the engine/axle ratio combination needed to
handle heavy loads.
EFFECTS OF INCORRECT FLUID LEVEL
A low fluid level allows the pump to take in air
along with the fluid. Air in the fluid will cause fluid
pressures to be low and develop slower than normal.
If the transmission is overfilled, the gears churn the
fluid into foam. This aerates the fluid and causing
the same conditions occurring with a low level. In
either case, air bubbles cause fluid overheating, oxi-
dation, and varnish buildup which interferes with
valve and clutch operation. Foaming also causes fluid
expansion which can result in fluid overflow from the
transmission vent or fill tube. Fluid overflow can eas-
ily be mistaken for a leak if inspection is not careful.
FLUID CONTAMINATION
Transmission fluid contamination is generally a
result of:
• adding incorrect fluid
• failure to clean dipstick and fill tube when
checking level
• engine coolant entering the fluid
• internal failure that generates debris
• overheat that generates sludge (fluid break-
down)
• failure to replace contaminated converter after
repair
The use of non-recommended fluids can result in
transmission failure. The usual results are erratic
shifts, slippage, abnormal wear and eventual failure
due to fluid breakdown and sludge formation. Avoid
this condition by using recommended fluids only.
The dipstick cap and fill tube should be wiped
clean before checking fluid level. Dirt, grease and
Fig. 151 Input Clutch Assembly
1 - INPUT SHAFT
2 - UNDERDRIVE CLUTCH
3 - OVERDRIVE CLUTCH
4 - REVERSE CLUTCH
5 - OVERDRIVE SHAFT
6 - UNDERDRIVE SHAFT
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AUTOMATIC TRANSMISSION - 42RLE
TJ
DRIVING CLUTCHES (Continued)
other foreign material on the cap and tube could fall
into the tube if not removed beforehand. Take the
time to wipe the cap and tube clean before withdraw-
ing the dipstick.
Engine coolant in the transmission fluid is gener-
ally caused by a cooler malfunction. The only remedy
is to replace the radiator as the cooler in the radiator
is not a serviceable part. If coolant has circulated
through the transmission, an overhaul is necessary.
The torque converter should be replaced whenever
a failure generates sludge and debris. This is neces-
sary because normal converter flushing procedures
will not remove all contaminants.
STANDARD PROCEDURE
STANDARD PROCEDURE - FLUID LEVEL
CHECK
FLUID LEVEL CHECK
The transmission sump has a dipstick to check oil
similar to most automatic transmissions. It is located
on the left side of the engine. Be sure to wipe all dirt
from dipstick handle before removing.
The torque converter fills in both the PARK and
NEUTRAL positions. Place the selector lever in
PARK to be sure that the fluid level check is accu-
rate. The engine should be running at idle
speed for at least one minute, with the vehicle
on level ground. At normal operating temperature
(approximately 82 C. or 180 F.), the fluid level is cor-
rect if it is in the HOT region (cross-hatched area) on
the oil level indicator. The fluid level should be in
COLD region at 70° F fluid temperature. Adjust fluid
level as necessary. Use only Mopar
t ATF+4, Auto-
matic Transmission Fluid.
FLUID LEVEL CHECK USING DRB
NOTE: Engine and Transmission should be at nor-
mal operating temperature before performing this
procedure.
(1) Start engine and apply parking brake.
(2) Connect DRBIII
t scan tool and select transmis-
sion.
(3) Select sensors.
(4) Read the transmission temperature value.
(5) Compare the fluid temperature value with the
chart.
(6) Adjust transmission fluid level shown on the
dipstick according to the 42RLE Fluid Temperature
Chart (Fig. 152). Use only Mopar
t ATF+4, Automatic
Transmission Fluid.
(7) Check transmission for leaks.
STANDARD PROCEDURE - FLUID/FILTER
SERVICE
NOTE: Only fluids of the type labeled Mopar
T
ATF+4, Automatic Transmission Fluid, should be
used in the transmission sump. A filter change
should be made at the time of the transmission oil
change. The magnet (on the inside of the oil pan)
should also be cleaned with a clean, dry cloth.
Fig. 152 42RLE Fluid Temperature Chart
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AUTOMATIC TRANSMISSION - 42RLE
21 - 111
FLUID AND FILTER (Continued)
NOTE: If the transmission is disassembled for any
reason, the fluid and filter should be changed.
(1) Raise vehicle on a hoist. Place a drain con-
tainer with a large opening, under transmission oil
pan.
NOTE: One of the oil pan bolts (5) has a sealing
patch applied from the factory. Separate this bolt
for reuse.
(2) Loosen pan bolts and tap the pan at one corner
to break it loose allowing fluid to drain, then remove
the oil pan.
(3) Install a new filter and o-ring on bottom of the
valve body and tighten retaining screws to 5 N·m (40
in. lbs.).
NOTE: Before installing the oil pan bolt (5) in the bolt
hole located between the torque converter clutch on
and U/D clutch pressure tap circuits (Fig. 153), it will
be necessary to replentish the sealing patch on the
bolt using Mopar
T
Lock & Seal Adhesive.
(4) Clean the oil pan and magnet. Reinstall pan
using new Mopar
t Silicone Adhesive sealant. Tighten
oil pan bolts to 19 N·m (165 in. lbs.).
(5) Pour four quarts of Mopar
t ATF+4, Automatic
Transmission Fluid, through the dipstick opening.
(6) Start engine and allow to idle for at least one
minute. Then, with parking and service brakes
applied, move selector lever momentarily to each
position, ending in the park or neutral position.
(7) Check the transmission fluid level and add an
appropriate amount to bring the transmission fluid
level to 3mm (1/8 in.) below the lowest mark on the
dipstick.
(8) Recheck the fluid level after the transmission
has reached normal operating temperature (180°F.).
(9) To prevent dirt from entering transmission,
make certain that dipstick is fully seated into the
dipstick opening.
STANDARD PROCEDURE - TRANSMISSION
FILL
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
+4, Automatic Transmission Fluid, to transmission:
(a) If only fluid and filter were changed, add 6
pints (3 quarts) of ATF +4 to transmission.
(b) If transmission was completely overhauled,
or torque converter was replaced or drained, add
10 pints (5 quarts) of ATF +4 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
noticably 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 foam-
ing and shifting problems can result.
(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.
Fig. 153 Pan Fastener
1 - FRONT DRIVESHAFT
2 - PRESSURE PORTS
3 - TRANSMISSION CASE
4 - TRANSMISSION OIL PAN
5 - SECOND TRANSMISSION OIL PAN BOLT ON LEFT SIDE
6 - FIRST TRANSMISSION OIL PAN BOLT
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AUTOMATIC TRANSMISSION - 42RLE
TJ
FLUID AND FILTER (Continued)
GEARSHIFT CABLE
REMOVAL
(1) Shift transmission into PARK.
(2) Remove shift lever bezel and necessary console
parts for access to shift lever assembly. (Refer to 23 -
BODY/INTERIOR/FLOOR CONSOLE - REMOVAL)
(3) Disconnect cable at shift lever (Fig. 154) and
feed cable through dash panel opening to underside
of vehicle.
(4) Raise vehicle.
(5) Disengage cable eyelet at transmission shift
lever and removel cable from the mounting bracket.
Then remove old cable from vehicle.
INSTALLATION
(1) Route cable through hole in dash panel. Fully
seat cable grommet into dash panel.
(2) Place the auto transmission manual shift con-
trol lever in “PARK” detent (rearmost) position and
rotate prop shaft to ensure transmission is in PARK.
(3) Snap the cable into the transmission bracket so
the retaining clip is engaged and connect cable end
fitting onto the manual control lever ball stud.
(4) Place the floor shifter lever in PARK position.
(5) Connect shift cable to shifter mechanism by
snapping cable retaining ears into shifter bracket
and press cable end fitting onto lever ball stud.
(6) Snap the cable into the transmission bracket so
the retaining ears are engaged and connect cable end
fitting onto the manual control lever ball stud.
(7) Adjust the shift mechanism.
(8) Install any floor console components removed
previously. (Refer to 23 - BODY/INTERIOR/FLOOR
CONSOLE - INSTALLATION)
Fig. 154 Shifter Cable Routing
1 - SHIFT MECHANISM
7 - MANUAL LEVER
2 - LOCK-TAB
8 - CABLE BRACKET
3 - IGNITION LOCK INTERLOCK
9 - SHIFTER CABLE
4 - STEERING COLUMN
10 - BELLHOUSING
5 - SOLENOID
11 - TIE STRAP
6 - WIRE CONNECTOR
12 - PARK/BRAKE INTERLOCK CABLE
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AUTOMATIC TRANSMISSION - 42RLE
21 - 113
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