Chrysler New Yorker. Manual — part 282
TRANSAXLE
CONTENTS
page
page
GENERAL INFORMATION
42LE TRANSAXLE . . . . . . . . . . . . . . . . . . . . . . . 2
FLUID LEVEL AND CONDITION . . . . . . . . . . . . . 2
SELECTION OF LUBRICANTS . . . . . . . . . . . . . . . 3
SPECIAL ADDITIVES . . . . . . . . . . . . . . . . . . . . . 3
DESCRIPTION AND OPERATION
ADAPTIVE CONTROLS . . . . . . . . . . . . . . . . . . . . 5
AUTOSTICK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CLUTCH AND GEAR . . . . . . . . . . . . . . . . . . . . . . 3
DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
HYDRAULICS . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SHIFTER/IGNITION INTERLOCK . . . . . . . . . . . . . 5
SHIFT POSITION INDICATOR . . . . . . . . . . . . . . . 6
SOLENOID ASSEMBLY . . . . . . . . . . . . . . . . . . . . 5
SOLENOIDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
TRANSMISSION CONTROL MODULE . . . . . . . . 5
TRANSMISSION CONTROL RELAY . . . . . . . . . . 5
TRANSMISSION RANGE SENSOR . . . . . . . . . . . 6
TRANSMISSION TEMPERATURE SENSOR . . . . 6
DIAGNOSIS AND TESTING
42LE FOUR SPEED TRANSAXLE ON-BOARD
DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . 12
42LE GENERAL DIAGNOSIS . . . . . . . . . . . . . . . . 6
AUTOSTICK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CLUTCH AIR PRESSURE TESTS . . . . . . . . . . . . 9
FLUID LEAKAGE . . . . . . . . . . . . . . . . . . . . . . . . . 9
HYDRAULIC PRESSURE TESTS . . . . . . . . . . . . . 7
ROAD TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SHIFTER/IGNITION INTERLOCK . . . . . . . . . . . . 11
SHIFT POSITION INDICATOR . . . . . . . . . . . . . . 11
SERVICE PROCEDURES
ALUMINUM THREAD REPAIR . . . . . . . . . . . . . 15
FLUID AND FILTER CHANGE-TRANSMISSION
SUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
FLUID DRAIN AND REFILL-DIFFERENTIAL
SUMP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
FLUSHING COOLERS AND TUBES . . . . . . . . . . 15
OIL PUMP VOLUME CHECK . . . . . . . . . . . . . . . 15
TRANSAXLE QUICK LEARN PROCEDURE . . . . 16
REMOVAL AND INSTALLATION
AUTOSTICK SHIFTER . . . . . . . . . . . . . . . . . . . . 20
COLUMN SHIFT INTERLOCK SERVICE . . . . . . 20
FLOOR SHIFTER . . . . . . . . . . . . . . . . . . . . . . . . 19
FLOOR SHIFT INTERLOCK SERVICE . . . . . . . . 20
GEARSHIFT CABLE–COLUMN SHIFT . . . . . . . . 16
GEARSHIFT CABLE–FLOOR SHIFT . . . . . . . . . . 18
LONG STUB SHAFT SEAL REPLACEMENT . . . 28
MANUAL VALVE LEVER . . . . . . . . . . . . . . . . . . 21
OIL PUMP SEAL REPLACEMENT . . . . . . . . . . . 26
SHORT STUB SHAFT SEAL REPLACEMENT . . 29
SOLENOID ASSEMBLY . . . . . . . . . . . . . . . . . . . 23
SPEED SENSOR–INPUT . . . . . . . . . . . . . . . . . . 22
SPEED SENSOR–OUTPUT . . . . . . . . . . . . . . . . 22
TRANSAXLE . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
TRANSFER SHAFT SEAL REPLACEMENT . . . . 27
TRANSMISSION CONTROL MODULE . . . . . . . 22
TRANSMISSION CONTROL RELAY . . . . . . . . . 22
TRANSMISSION RANGE SENSOR . . . . . . . . . . 22
VALVE BODY . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DISASSEMBLY AND ASSEMBLY
DIFFERENTIAL RECONDITION . . . . . . . . . . . . . 72
INPUT CLUTCHES-RECONDITION . . . . . . . . . . 46
TRANSAXLE ASSEMBLE . . . . . . . . . . . . . . . . . 57
TRANSAXLE DISASSEMBLE . . . . . . . . . . . . . . . 31
VALVE BODY . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
CLEANING AND INSPECTION
SNUBBER GAP MEASUREMENT . . . . . . . . . . . 91
TRANSFER CHAINS LENGTH
MEASUREMENT . . . . . . . . . . . . . . . . . . . . . . 89
ADJUSTMENTS
AUTOSTICK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
BEARING ADJUSTMENT PROCEDURES . . . . . 93
DRIVE SPROCKET HEIGHT ADJUSTMENT
PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . 93
FLOOR SHIFT INTERLOCK ADJUSTMENT . . . . 92
GEARSHIFT CABLE–COLUMN SHIFT . . . . . . . . 91
GEARSHIFT CABLE–FLOOR SHIFT . . . . . . . . . . 92
MASTER SHIM CHART . . . . . . . . . . . . . . . . . . . 93
SCHEMATICS AND DIAGRAMS
42LE TRANSAXLE HYDRAULIC SCHEMATICS . 96
SPECIFICATIONS
42LE AUTOMATIC TRANSAXLE . . . . . . . . . . . 109
300M
TRANSAXLE
21 - 1
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . 109
SPECIAL TOOLS
42LE AUTOMATIC TRANSAXLE . . . . . . . . . . . 110
GENERAL INFORMATION
42LE TRANSAXLE
The 42LE Four Speed Transaxle uses fully-adap-
tive controls. Adaptive controls are those which per-
form their functions based on real-time feedback
sensor information. The transaxle is conventional in
the use of hydraulically applied clutches to shift a
planetary gear train. It uses electronics to control
virtually all other functions (Fig. 1) (Fig. 2).
42LE TRANSAXLE IDENTIFICATION
The 42LE transaxle identification code is printed
on a bar code label. The label is located on the tran-
saxle case (Fig. 3).
IN-VEHICLE SERVICE
The following is a list of transaxle components that
are serviceable in the vehicle:
• Valve Body Assembly
• Solenoid Pack
• Transmission Range Sensor (TRS)
• Input Speed Sensor
• Output Speed Sensor
• Transfer Chain
• Chain Sprockets
• Short (Right) Stub Shaft Seal
• Long (left) Stub Shaft and Ball Bearing
OPERATION
The 42LE transaxle provides forward ratios of
2.84, 1.57, 1.00, and 0.69. The torque converter
clutch is available in 2nd, direct, or overdrive gear.
The Reverse ratio is 2.21. The Autostick shift lever
has five positions (P, R, N, OD, and Autostick). Final
drive ratio is dependent on which engine option is
selected. The 2.7L has a FDR of 3.89. The 3.2/3.5 has
a FDR of 3.66. This change is accomplished by using
different transfer gear sprockets.
FLUID LEVEL AND CONDITION
NOTE: The transmission and differential have sep-
arate oil sumps. The transmission sump requires
automatic transmission fluid. The differential sump
requires petroleum based hypoid gear lube.
TRANSMISSION SUMP
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.
Fig. 1 Left Side View of Transaxle
Fig. 2 Right Side View of Transaxle
Fig. 3 Identification Tag Location
21 - 2
TRANSAXLE
300M
The torque converter fills in both the P Park and N
Neutral positions. Place the selector lever in P Park
to be sure that the fluid level check is accurate. The
engine should be running at idle speed for at
least one minute, with the vehicle on level
ground. At normal operating temperature (approxi-
mately 82 C. or 180 F.), the fluid level is correct if it
is in the HOT region (cross-hatched area) on the oil
level indicator (Fig. 4). The fluid level will be approx-
imately one-quarter inch above the lower hole of the
dipstick at 70° F fluid temperature.
FLUID LEVEL CHECK USING DRB
NOTE: Engine and Transaxle should be at normal
operating temperature before performing this proce-
dure.
(1) Start engine and apply parking brake.
(2) Hook up DRBIII 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 chart.
(7) Check transmission for leaks.
Low fluid level can cause a variety of conditions
because it allows the pump to take in air along with
the fluid. As in any hydraulic system, air bubbles
make the fluid spongy, therefore, pressures will be
low and build up slowly.
Improper filling can also raise the fluid level too
high. When the transaxle has too much fluid, the
gears churn up foam and cause the same conditions
which occur with a low fluid level.
In either case, air bubbles can cause overheating
and/or fluid oxidation, and varnishing. This can
interfere with normal valve, clutch, and accumulator
operation. Foaming can also result in fluid escaping
from the transaxle vent where it may be mistaken
for a leak.
Along with fluid level, it is important to check the
condition of the fluid. When the fluid smells burned,
and is contaminated with metal or friction material
particles, a complete transaxle recondition is needed.
Be sure to examine the fluid on the dipstick closely.
If there is any doubt about its condition, drain out a
sample for a double check.
After the fluid has been checked, seat the dipstick
fully to seal out water and dirt.
The transmission fluid level should be inspected at
least every six months.
DIFFERENTIAL SUMP
The differential sump is checked separately from
the transmission. A fill plug located on the side of the
transaxle must be removed to check fluid level. The
fluid should be level with the bottom of the fill hole.
The differential capacity is .946 liters (32 ounces).
Inspect the differential area during engine oil
changes for any leaks. If leakage is present, deter-
mine the source of the leak and repair as required.
Remove the fill plug and verify the proper level.
Adjust if needed.
SELECTION OF LUBRICANTS
It is important that the proper lubricants be used
in the 42LE transaxle. Mopar ATF Plus 3 (Automatic
Transmission Fluid-Type 7176) should be used in the
transmission side of the transaxle. Substitute fluids
can induce torque converter clutch shudder.
The differential side of the transaxle should be
filled with Mopar Fuel Saving 75W-90 hypoid gear
lubricant. Synthetic gear lubricants should not be
used.
SPECIAL ADDITIVES
Chrysler Corporation does not recommend the
addition of any fluids to the transmission, other than
the fluid listed above. An exception to this policy is
the use of special dyes to aid in detecting fluid leaks.
The use of transmission sealers should be avoided,
since they may adversely affect seals.
DESCRIPTION AND OPERATION
CLUTCH AND GEAR
The 42LE transaxle consists of:
• Three multiple-disc input clutches
• Two multiple-disc grounded clutches
• Four hydraulic accumulators
• Two planetary gear sets
This provides four forward ratios and a reverse
ratio. The clutch apply pistons have centrifugally bal-
Fig. 4 Dipstick Markings
300M
TRANSAXLE
21 - 3
GENERAL INFORMATION (Continued)
anced oil cavities so that quick response and good
control can be achieved. A push/pull piston is incor-
porated for two of the three input clutches.
CAUTION: Some clutch packs appear similar, but
they are not the same. Do not interchange clutch
components as they might fail.
HYDRAULICS
The hydraulics of the transaxle provide:
• Manual shift lever select function
• Main line pressure regulation
• Torque converter flow control
• Transaxle oil cooler flow control
Oil flow to the friction elements is controlled
directly by four solenoid valves. The hydraulics also
include a logic-controlled solenoid switch valve. It
locks out the 1st gear reaction element with the
application of 2nd, direct, or overdrive gear elements.
It also redirects the 1st gear solenoid output so that
it can control torque converter clutch operation. To
regain access to 1st gear, a special sequence of sole-
noid commands must be used to unlock and move the
solenoid switch valve. This precludes any application
of the 1st gear reaction element with other elements
applied. It also allows one solenoid to control two
friction elements.
Small, high-rate accumulators are provided in each
controlled friction element circuit. These serve to
absorb the pressure responses, and allow the controls
to read and respond to changes that are occurring.
SOLENOIDS
Since the solenoid valves perform all control func-
tions, these valves must be durable and tolerant of
dirt particles. For that reason hardened- steel poppet
and ball valves are used. These are free from any
close operating clearances, and the solenoids operate
the valves directly. Direct operation means that these
units must have very high output. They must close
against the sizeable flow areas and high line pres-
sures. Fast response is also required to meet the con-
trol requirements.
Two of the solenoids are normally-venting and two
are normally-applying; this was done to provide a
default mode of operation. With no electrical power,
the transmission provides 2nd gear in OD, 3, or L
shift lever positions. All other shift lever positions
will function normally. The choice of 2nd gear was
made to provide adequate performance while still
accommodating highway speeds.
Transmission Fluid Temperature Chart
21 - 4
TRANSAXLE
300M
DESCRIPTION AND OPERATION (Continued)
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