2001 DODGE RAM Service Repair Manual

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Page 1769 of 2889

DODGE RAM 2001 Service Repair Manual AUTOMATIC TRANSMISSION - 42RE
TABLE OF CONTENTS
page page
AUTOMATIC TRANSMISSION - 42RE
DESCRIPTION..........................135
OPERATION............................137
DIAGNOSIS AND TESTING.........

AUTOMATIC TRANSMISSION - 42RE
TABLE OF CONTENTS
page page
AUTOMATIC TRANSMISSION - 42RE
DESCRIPTION..........................135
OPERATION............................137
DIAGNOSIS AND TESTING................143
AUTOMATIC TRANSMISSION.............143
PRELIMINARY........................143
ROAD TESTING.......................143
HYDRAULIC PRESSURE TEST...........144
AIR CHECKING TRANSMISSION CLUTCH
AND BAND OPERATION.................147
CONVERTER HOUSING FLUID LEAK......148
DIAGNOSIS CHARTS...................149
STANDARD PROCEDURE.................159
ALUMINUM THREAD REPAIR.............159
REMOVAL.............................159
DISASSEMBLY..........................160
CLEANING.............................165
INSPECTION...........................165
ASSEMBLY............................166
INSTALLATION..........................173
SCHEMATICS AND DIAGRAMS.............174
SPECIFICATIONS........................186
SPECIAL TOOLS........................188
ACCUMULATOR
DESCRIPTION..........................191
OPERATION............................191
INSPECTION...........................192
BANDS
DESCRIPTION..........................192
OPERATION............................192
ADJUSTMENTS.........................193
ELECTRONIC GOVERNOR
DESCRIPTION..........................194
OPERATION............................194
REMOVAL.............................196
INSTALLATION..........................197
EXTENSION HOUSING BUSHING
REMOVAL.............................198
INSTALLATION..........................198
EXTENSION HOUSING SEAL
REMOVAL.............................198
INSTALLATION..........................198
FLUID AND FILTER
DIAGNOSIS AND TESTING................199
EFFECTS OF INCORRECT FLUID LEVEL . . . 199
CAUSES OF BURNT FLUID..............199
FLUID CONTAMINATION................199
STANDARD PROCEDURE.................199
FLUID LEVEL CHECK...................199FLUID AND FILTER REPLACEMENT.......201
TRANSMISSION FILL...................201
FRONT CLUTCH
DESCRIPTION..........................202
OPERATION............................202
DISASSEMBLY..........................202
INSPECTION...........................205
ASSEMBLY............................206
FRONT SERVO
DESCRIPTION..........................206
OPERATION............................207
DISASSEMBLY..........................207
CLEANING.............................207
INSPECTION...........................207
ASSEMBLY............................208
OIL PUMP
DESCRIPTION..........................208
OPERATION............................208
STANDARD PROCEDURE.................209
OIL PUMP VOLUME CHECK..............209
DISASSEMBLY..........................209
CLEANING.............................211
INSPECTION...........................211
ASSEMBLY............................212
OUTPUT SHAFT FRONT BEARING
REMOVAL.............................213
INSTALLATION..........................213
OUTPUT SHAFT REAR BEARING
REMOVAL.............................213
INSTALLATION..........................213
OVERDRIVE CLUTCH
DESCRIPTION..........................214
OPERATION............................214
OVERDRIVE OFF SWITCH
DESCRIPTION..........................215
OPERATION............................215
DIAGNOSIS AND TESTING................215
OVERDRIVE ELECTRICAL CONTROLS.....215
REMOVAL.............................215
INSTALLATION..........................215
OVERDRIVE UNIT
REMOVAL.............................216
DISASSEMBLY..........................217
CLEANING.............................224
INSPECTION...........................224
ASSEMBLY............................225
INSTALLATION..........................234
21 - 134 AUTOMATIC TRANSMISSION - 42REBR/BE

Page 1770 of 2889

DODGE RAM 2001 Service Repair Manual OVERRUNNING CLUTCH CAM/OVERDRIVE
PISTON RETAINER
DESCRIPTION..........................235
OPERATION............................235
DISASSEMBLY..........................235
CLEANING....................

OVERRUNNING CLUTCH CAM/OVERDRIVE
PISTON RETAINER
DESCRIPTION..........................235
OPERATION............................235
DISASSEMBLY..........................235
CLEANING.............................236
INSPECTION...........................236
ASSEMBLY............................236
PARK/NEUTRAL POSITION SWITCH
DIAGNOSIS AND TESTING................237
PARK/NEUTRAL POSITION SWITCH.......237
REMOVAL.............................238
INSTALLATION..........................238
PISTONS
DESCRIPTION..........................238
OPERATION............................238
PLANETARY GEARTRAIN/OUTPUT SHAFT
DESCRIPTION..........................240
OPERATION............................240
DISASSEMBLY..........................240
INSPECTION...........................241
ASSEMBLY............................241
REAR CLUTCH
DESCRIPTION..........................246
OPERATION............................246
DISASSEMBLY..........................247
CLEANING.............................247
INSPECTION...........................248
ASSEMBLY............................248
REAR SERVO
DESCRIPTION..........................250
OPERATION............................250
DISASSEMBLY..........................251
CLEANING.............................251
ASSEMBLY............................251
SHIFT MECHANISM
DESCRIPTION..........................251OPERATION............................251
ADJUSTMENTS.........................252
SOLENOID
DESCRIPTION..........................252
OPERATION............................253
SPEED SENSOR
DESCRIPTION..........................253
OPERATION............................253
THROTTLE VALVE CABLE
DESCRIPTION..........................253
ADJUSTMENTS.........................254
TORQUE CONVERTER
DESCRIPTION..........................256
OPERATION............................260
REMOVAL.............................261
INSTALLATION..........................261
TORQUE CONVERTER DRAINBACK VALVE
DESCRIPTION..........................262
OPERATION............................262
STANDARD PROCEDURE.................262
TORQUE CONVERTER DRAINBACK VALVE . 262
TRANSMISSION TEMPERATURE SENSOR
DESCRIPTION..........................262
OPERATION............................262
VALVE BODY
DESCRIPTION..........................263
OPERATION............................267
REMOVAL.............................281
DISASSEMBLY..........................282
CLEANING.............................293
INSPECTION...........................293
ASSEMBLY............................294
INSTALLATION..........................303
ADJUSTMENTS.........................304
AUTOMATIC TRANSMISSION -
42RE
DESCRIPTION
The 42RE is a four speed fully automatic transmis-
sion (Fig. 1) with an electronic governor. The 42RE is
equipped with a lock-up clutch in the torque con-
verter. First through third gear ranges are provided
by the clutches, bands, overrunning clutch, and plan-
etary gear sets in the transmission. Fourth gear
range is provided by the overdrive unit that contains
an overdrive clutch, direct clutch, planetary gear set,
and overrunning clutch.
The transmission contains a front, rear, and direct
clutch which function as the input driving compo-
nents. It also contains the kickdown (front) and thelow/reverse (rear) bands which, along with the over-
running clutch and overdrive clutch, serve as the
holding components. The driving and holding compo-
nents combine to select the necessary planetary gear
components, in the front, rear, or overdrive planetary
gear set, transfer the engine power from the input
shaft through to the output shaft.
The valve body is mounted to the lower side of the
transmission and contains the valves to control pres-
sure regulation, fluid flow control, and clutch/band
application. The oil pump is mounted at the front of
the transmission and is driven by the torque con-
verter hub. The pump supplies the oil pressure nec-
essary for clutch/band actuation and transmission
lubrication.
BR/BEAUTOMATIC TRANSMISSION - 42RE 21 - 135

Page 1771 of 2889

DODGE RAM 2001 Service Repair Manual Fig. 1 42RE Transmission
21 - 136 AUTOMATIC TRANSMISSION - 42REBR/BE
AUTOMATIC TRANSMISSION - 42RE (Continued)

Page 1772 of 2889

DODGE RAM 2001 Service Repair Manual IDENTIFICATION
Transmission identification numbers are stamped
on the left side of the case just above the oil pan gas-
ket surface (Fig. 2). Refer to this information when
ordering replacement parts.

IDENTIFICATION
Transmission identification numbers are stamped
on the left side of the case just above the oil pan gas-
ket surface (Fig. 2). Refer to this information when
ordering replacement parts.
GEAR RATIOS The 42RE gear ratios are:
1st.................................2.74:1
2nd................................1.54:1
3rd.................................1.00:1
4th.................................0.69:1
Rev.................................2.21:1
OPERATION
The application of each driving or holding compo-
nent is controlled by the valve body based upon the
manual lever position, throttle pressure, and gover-
nor pressure. The governor pressure is a variable
pressure input to the valve body and is one of the
signals that a shift is necessary. First through fourth
gear are obtained by selectively applying and releas-
ing the different clutches and bands. Engine power is
thereby routed to the various planetary gear assem-
blies which combine with the overrunning clutch
assemblies to generate the different gear ratios. The
torque converter clutch is hydraulically applied and
is released when fluid is vented from the hydraulic
circuit by the torque converter control (TCC) solenoid
on the valve body. The torque converter clutch is con-
trolled by the Powertrain Control Module (PCM). The
torque converter clutch engages in fourth gear, and
in third gear under various conditions, such as when
the O/D switch is OFF, when the vehicle is cruising
on a level surface after the vehicle has warmed up.
The torque converter clutch will disengage momen-
tarily when an increase in engine load is sensed by
the PCM, such as when the vehicle begins to go
uphill or the throttle pressure is increased. The
torque converter clutch feature increases fuel econ-
omy and reduces the transmission fluid temperature.
Since the overdrive clutch is applied in fourth gear
only and the direct clutch is applied in all ranges
except fourth gear, the transmission operation for
park, neutral, and first through third gear will be
described first. Once these powerflows are described,
the third to fourth shift sequence will be described.
1 - CONVERTER CLUTCH 15 - HOUSING
2 - TORQUE CONVERTER 16 - REAR BEARING
3 - OIL PUMP AND REACTION SHAFT SUPPORT ASSEMBLY 17 - OUTPUT SHAFT
4 - FRONT BAND 18 - SEAL
5 - FRONT CLUTCH 19 - OVERDRIVE OVERRUNNING CLUTCH
6 - DRIVING SHELL 20 - OVERDRIVE PLANETARY GEAR
7 - REAR BAND 21 - DIRECT CLUTCH SPRING
8 - TRANSMISSION OVERRUNNING CLUTCH 22 - OVERDRIVE CLUTCH PISTON
9 - OVERDRIVE UNIT 23 - VALVE BODY ASSEMBLY
10 - PISTON RETAINER 24 - FILTER
11 - OVERDRIVE CLUTCH 25 - FRONT PLANETARY GEAR
12 - DIRECT CLUTCH 26 - REAR CLUTCH
13 - INTERMEDIATE SHAFT 27 - TRANSMISSION
14 - FRONT BEARING 28 - REAR PLANETARY GEAR
Fig. 2 Transmission Part And Serial Number
Location
1 - PART NUMBER
2 - BUILD DATE
3 - SERIAL NUMBER
BR/BEAUTOMATIC TRANSMISSION - 42RE 21 - 137
AUTOMATIC TRANSMISSION - 42RE (Continued)

Page 1773 of 2889

DODGE RAM 2001 Service Repair Manual PARK POWERFLOW
As the engine is running and the crankshaft is
rotating, the flexplate and torque converter, which
are also bolted to it, are all rotating in a clockwise
direction as viewed from the fr

Page 1774 of 2889

DODGE RAM 2001 Service Repair Manual REVERSE POWERFLOW
When the gear selector is moved into the
REVERSE position (Fig. 5), the front clutch and the
rear band are applied. With the application of the
front clutch, engine torque is applied

Page 1775 of 2889

DODGE RAM 2001 Service Repair Manual FIRST GEAR POWERFLOW
When the gearshift lever is moved into the DRIVE
position the transmission goes into first gear (Fig. 6).
As soon as the transmission is shifted from PARK or
NEUTRAL to DRIVE, the

Page 1776 of 2889

DODGE RAM 2001 Service Repair Manual SECOND GEAR POWERFLOW
In DRIVE-SECOND (Fig. 7), the same elements
are applied as in MANUAL-SECOND. Therefore, the
power flow will be the same, and both gears will be
discussed as one in the same. In D

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