2002 DODGE RAM Service Repair Manual

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Page 1713 of 2255

DODGE RAM 2002 Service Repair Manual OVERDRIVE SWITCH
DESCRIPTION........................344
OPERATION..........................344
DIAGNOSIS AND TESTING - OVERDRIVE
ELECTRICAL CONTROLS..............344
REMOVAL...........................

OVERDRIVE SWITCH
DESCRIPTION........................344
OPERATION..........................344
DIAGNOSIS AND TESTING - OVERDRIVE
ELECTRICAL CONTROLS..............344
REMOVAL............................344
INSTALLATION........................345
OVERDRIVE UNIT
REMOVAL............................345
DISASSEMBLY........................346
CLEANING...........................353
INSPECTION.........................353
ASSEMBLY...........................354
INSTALLATION........................362
OVERRUNNING CLUTCH CAM/OVERDRIVE
PISTON RETAINER
DESCRIPTION........................363
OPERATION..........................363
DISASSEMBLY........................364
CLEANING...........................364
INSPECTION.........................364
ASSEMBLY...........................364
PARK/NEUTRAL POSITION SWITCH
DIAGNOSIS AND TESTING - PARK/NEUTRAL
POSITION SWITCH...................367
REMOVAL............................367
INSTALLATION........................367
PISTONS
DESCRIPTION........................367
OPERATION..........................367
PLANETARY GEARTRAIN/OUTPUT SHAFT
DESCRIPTION........................369
OPERATION..........................369
DISASSEMBLY........................369
INSPECTION.........................371
ASSEMBLY...........................371
REAR CLUTCH
DESCRIPTION........................375
OPERATION..........................375
DISASSEMBLY........................376
CLEANING...........................377
INSPECTION.........................377
ASSEMBLY...........................377
REAR SERVO
DESCRIPTION........................378OPERATION..........................378
DISASSEMBLY........................378
CLEANING...........................379
ASSEMBLY...........................379
SHIFT MECHANISM
DESCRIPTION........................379
OPERATION..........................379
ADJUSTMENTS
ADJUSTMENT.......................380
SOLENOID
DESCRIPTION........................380
OPERATION..........................381
SPEED SENSOR
DESCRIPTION........................381
OPERATION..........................381
THROTTLE VALVE CABLE
DESCRIPTION........................381
ADJUSTMENTS - TRANSMISSION THROTTLE
VALVE CABLE.......................382
TORQUE CONVERTER
DESCRIPTION........................384
OPERATION..........................388
REMOVAL............................389
INSTALLATION........................389
TORQUE CONVERTER DRAINBACK VALVE
DESCRIPTION........................390
OPERATION..........................390
STANDARD PROCEDURE - TORQUE
CONVERTER DRAINBACK VALVE........390
TRANSMISSION TEMPERATURE SENSOR
DESCRIPTION........................390
OPERATION..........................390
VALVE BODY
DESCRIPTION........................391
OPERATION..........................394
REMOVAL............................407
DISASSEMBLY........................409
CLEANING...........................418
INSPECTION.........................419
ASSEMBLY...........................420
INSTALLATION........................428
ADJUSTMENTS - VALVE BODY...........428
21 - 260 AUTOMATIC TRANSMISSION - 47REBR/BE

Page 1714 of 2255

DODGE RAM 2002 Service Repair Manual AUTOMATIC TRANSMISSION -
47RE
DESCRIPTION
The 47RE (Fig. 1) is a four speed fully automatic
transmissions with an electronic governor. The 47RE
is equipped with a lock-up clutch in the torque con-
ver

Page 1715 of 2255

DODGE RAM 2002 Service Repair Manual Fig. 1 47RE Transmission
21 - 262 AUTOMATIC TRANSMISSION - 47REBR/BE
AUTOMATIC TRANSMISSION - 47RE (Continued)

Page 1716 of 2255

DODGE RAM 2002 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 47RE gear ratios are:
1st.................................2.45:1
2nd................................1.45:1
3rd.................................1.00:1
4th.................................0.69:1
Rev..................................2.21
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 - TORQUE CONVERTER 11 - DIRECT CLUTCH
2 - INPUT SHAFT 12 - PLANETARY GEAR
3 - OIL PUMP 13 - OUTPUT SHAFT
4 - FRONT BAND 14 - SEAL
5 - FRONT CLUTCH 15 - INTERMEDIATE SHAFT
6 - REAR CLUTCH 16 - OVERDRIVE OVERRUNNING CLUTCH
7 - PLANETARIES 17 - DIRECT CLUTCH SPRING
8 - REAR BAND 18 - OVERDRIVE PISTON RETAINER
9 - OVERRUNNING CLUTCH 19 - FILTER
10 - OVERDRIVE CLUTCH 20 - VALVE BODY
Fig. 2 Transmission Part and Serial Number
Location
1 - PART NUMBER
2 - BUILD DATE
3 - SERIAL NUMBER
BR/BEAUTOMATIC TRANSMISSION - 47RE 21 - 263
AUTOMATIC TRANSMISSION - 47RE (Continued)

Page 1717 of 2255

DODGE RAM 2002 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

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 front of the engine. The
notched hub of the torque converter is connected to
the oil pump's internal gear, supplying the transmis-
sion with oil pressure. As the converter turns, it
turns the input shaft in a clockwise direction. As the
input shaft is rotating, the front clutch hub-rear
clutch retainer and all their associated parts are also
rotating, all being directly connected to the input
shaft. The power flow from the engine through the
front clutch hub and rear clutch retainer stops at the
rear clutch retainer. Therefore, no power flow to the
output shaft occurs because no clutches are applied.
The only mechanism in use at this time is the park-
ing sprag (Fig. 3), which locks the parking gear on
the output shaft to the transmission case.
NEUTRAL POWERFLOW
With the gear selector in the NEUTRAL position
(Fig. 4), the power flow of the transmission is essen-
tially the same as in the park position. The only
operational difference is that the parking sprag has
been disengaged, unlocking the output shaft from the
transmission case and allowing it to move freely.
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 to the sun gear,
turning it in a clockwise direction. The clockwise
rotation of the sun gear causes the rear planet pin-
ions to rotate against engine rotation in a counter-
clockwise direction. The rear band is holding the low
reverse drum, which is splined to the rear carrier.
Since the rear carrier is being held, the torque from
the planet pinions is transferred to the rear annulus
gear, which is splined to the output shaft. The output
shaft in turn rotates with the annulus gear in a
counterclockwise direction giving a reverse gear out-
put. The entire transmission of torque is applied to
the rear planetary gearset only. Although there is
torque input to the front gearset through the sun
gear, no other member of the gearset is being held.
During the entire reverse stage of operation, the
front planetary gears are in an idling condition.
Fig. 3 Park Powerflow
1 - LEVER ENGAGED FOR PARK
2 - PARK SPRAG
3 - OUTPUT SHAFT
Fig. 4 Neutral Powerflow
1 - PAWL DISENGAGED FOR NEUTRAL
2 - PARK SPRAG
3 - OUTPUT SHAFT
4 - CAM
5-PAWL
21 - 264 AUTOMATIC TRANSMISSION - 47REBR/BE
AUTOMATIC TRANSMISSION - 47RE (Continued)

Page 1718 of 2255

DODGE RAM 2002 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 1719 of 2255

DODGE RAM 2002 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

Page 1720 of 2255

DODGE RAM 2002 Service Repair Manual DIRECT DRIVE POWERFLOW
The vehicle has accelerated and reached the shift
point for the 2-3 upshift into direct drive (Fig. 8).
When the shift takes place, the front band is
released, and the front clu

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