Page 1593 of 2399

REAR CLUTCH
Apply air pressure to rear clutch apply passage
and listen for a dull thud which indicates that rear
clutch is operating. Also inspect for excessive oil
leaks. If a dull thud cannot be heard in the clutches,
place finger tips on clutch housing and again apply
air pressure. Movement of piston can be felt as the
clutch is applied.
KICKDOWN SERVO (FRONT)
Direct air pressure into KICKDOWN SERVO ON
passage. Operation of servo is indicated by a tighten-
ing of front band. Spring tension on servo piston
should release the band.
LOW AND REVERSE SERVO (REAR)
Direct air pressure into LOW-REVERSE SERVO
APPLY passage. Operation of servo is indicated by a
tightening of rear band. Spring tension on servo pis-
ton should release the band.
If clutches and servos operate properly, no upshift
indicates that a malfunction exists in the valve body.
Fig. 5 Air Pressure Tests
1 - PUMP SUCTION 7 - TO OIL COOLER 13 - GOVERNOR PRESSURE
2 - PUMP PRESSURE 8 - KICKDOWN SERVO OFF 14 - LINE PRESSURE TO GOVERNOR
3 - FRONT CLUTCH APPLY 9 - KICKDOWN SERVO ON 15 - GOVERNOR PRESSURE PLUG
4 - REAR CLUTCH APPLY 10 - ACCUMULATOR OFF 16 - GOVERNOR PRESSURE
5 - TO TORQUE CONVERTER 11 - ACCUMULATOR ON 17 - BYPASS VALVE BORE
6 - FROM TORQUE CONVERTER 12 - LOW-REVERSE SERVO APPLY
21 - 36 31TH AUTOMATIC TRANSAXLERS
31TH AUTOMATIC TRANSAXLE (Continued)
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Page 1594 of 2399

STANDARD PROCEDURE - ALUMINUM
THREAD REPAIR
Damaged or worn threads in the aluminum trans-
axle 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-
ping the hole with a Heli-Coil tap, or equivalent, 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
(1) Disconnect battery negative cable.
(2) Remove fluid level indicator tube bolt and tube/
indicator assembly (Fig. 6). Plug opening to prevent
debris intrusion.
(3) Disconnect torque converter clutch solenoid
(TCC) connector.
(4) Disconnect kickdown cable from lever and
bracket (Fig. 7). Position out of way.
(5) Disconnect gearshift cable from manual valve
lever and upper mount bracket (Fig. 8). Position out
of way.
(6) Disconnect back-up lamp switch connector.
(7) Remove upper two (2) transaxle-to-engine bolts.
Fig. 6 Fluid Level Indicator Assembly
1 - INDICATOR ASSEMBLY
2 - BOLT
3 - KICKDOWN CABLE BRACKET
4 - SEAL
Fig. 7 Throttle Valve Cable at Transaxle
1 - LEVER
2 - BRACKET
3 - THROTTLE VALVE CABLE
Fig. 8 Gearshift Cable at Transaxle
1 - MANUAL VALVE LEVER
2 - GEAR SHIFT CABLE
3 - UPPER MOUNT BRACKET
RS31TH AUTOMATIC TRANSAXLE21-37
31TH AUTOMATIC TRANSAXLE (Continued)
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Page 1595 of 2399
(8) Remove three (3) rear mount bracket-to-trans-
axle case bolts (Fig. 9).
(9) Raise vehicle on hoist.
(10) Remove halfshafts. (Refer to 3 - DIFFEREN-
TIAL & DRIVELINE/HALF SHAFT - REMOVAL)
(11) Remove starter motor assembly (Fig. 10).
Fig. 9 Rear Mount Bracket
1 - BOLT - VERTICAL
2 - BRACKET - REAR MOUNT3 - BOLT - HORIZONTAL
Fig. 10 Starter Motor Removal/Installation
1 - STARTER MOTOR
2 - BOLT
3 - BOLT
21 - 38 31TH AUTOMATIC TRANSAXLERS
31TH AUTOMATIC TRANSAXLE (Continued)
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Page 1596 of 2399
(12) Remove front mount and bracket (Fig. 11).
(13) Cut transaxle oil cooler lines flush with fit-
tings. a service kit will be installed upon reintalla-
tion. Plug lines and fittings to prevent debris
intrusion.
(14) Remove structural collar (Fig. 12).
(15) Disconnect vehicle speed sensor connector.
(16) Remove rear mount shield (Fig. 13).
(17) Remove rear mount thru-bolt.
(18) Support engine with screw jack and wood
block.
(19) Remove torque converter-to-drive plate bolts.
(20) Remove left wheel splash shield.
Fig. 11 Front Mount and Bracket
1 - BRACKET - FRONT MOUNT
2 - NUT
3 - BOLT
4 - MOUNT - FRONT INSULATOR
5 - BOLT
6 - BOLT
7 - FRONT CROSSMEMBER
Fig. 12 Structural Collar
1 - BOLT - COLLAR TO OIL PAN
2 - BOLT - COLLAR TO TRANSAXLE
3 - STRUCTURAL COLLAR
4 - OIL PAN
Fig. 13 Rear Mount Heat Shield
1 - BOLT - HEAT SHIELD
2 - HEAT SHIELD
3 - CLIP
4 - REAR MOUNT
RS31TH AUTOMATIC TRANSAXLE21-39
31TH AUTOMATIC TRANSAXLE (Continued)
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Page 1597 of 2399

(21) Remove left upper mount thru-bolt (Fig. 14).
(22) Lower engine/transaxle assembly.
(23) Obtain transmission jack and helper.
(24) Remove remaining transaxle-to-engine bolts
and remove transaxle assembly from vehicle.
DISASSEMBLY
CAUTION: If transaxle failure has occured, it is nec-
essary to flush the transaxle oil cooler and lines to
remove debris and particles that could contaminate
and/or fail a new or rebuilt unit. (Refer to 7 - COOL-
ING/TRANSMISSION - STANDARD PROCEDURE)
NOTE: This procedure does not include disassem-
bly of final drive (differential) components. (Refer to
21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
31TH/FINAL DRIVE - DISASSEMBLY)
(1)
Measure input shaft end play before disassembly
using Tool 8266 and dial indicator C-3339 (Fig. 15):
(a) Set up tools as shown in (Fig. 15).
(b) Move input shaft in and out to obtain end
play reading. End play specifications are 0.19 to
1.50 mm (0.008 to 0.060 inch).
(c) Record indicator reading for reference when
reassembling the transaxle.
(2)
Remove transaxle oil pan-to-case bolts (Fig. 16).
Fig. 14 Left Rail-to-Mount
1 - FRAME BRACKET
2 - FRAME RAIL - LEFT
3 - BOLT
4 - TRANSAXLE MOUNT
Fig. 15 Measure Input Shaft End Play using End
Play Set 8266
1 - TOOL 8266±8
2 - TOOL 8266±2
3 - TOOL C-3339
Fig. 16 Transaxle Oil Pan Bolts
1 - TRANSAXLE OIL PAN
2 - OIL PAN BOLTS
21 - 40 31TH AUTOMATIC TRANSAXLERS
31TH AUTOMATIC TRANSAXLE (Continued)
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Page 1598 of 2399
(3) Remove oil pan (Fig. 17). Clean sealing sur-
faces of old adhesive prior to reassembly.
(4) Remove oil filter-to-valve body screws (Fig. 18).(5) Remove oil filter and gasket (Fig. 19).
(6) Remove neutral starting and back-up lamp
switch.
(7) Remove park rod retainer e-clip (Fig. 20).
Fig. 17 Transaxle Oil Pan
1 - TRANSAXLE OIL PAN
2 - OIL FILTER
Fig. 18 Oil Filter Screws
1 - SCREWDRIVER HANDLE
2 - SPECIAL TOOL L-4553
3 - OIL FILTER SCREWS (2)
4 - OIL FILTER
Fig. 19 Oil Filter and Gasket
1 - OIL FILTER
2 - GASKET
3 - VALVE BODY
Fig. 20 Parking Rod E-Clip
1 - VALVE BODY
2 - SCREWDRIVER
3 - ªEº CLIP
4 - PARKING ROD
RS31TH AUTOMATIC TRANSAXLE21-41
31TH AUTOMATIC TRANSAXLE (Continued)
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Page 1599 of 2399
(8) Remove park rod from transaxle (Fig. 21).
(9) Remove cooler bypass valve and seal (Fig. 22).(10) Remove valve body-to-transaxle bolts (Fig.
23).
(11) Remove valve body from transaxle (Fig. 24).
Note orientation and location of governor tubes.
Fig. 21 Parking Rod
1 - VALVE BODY
2 - PARKING ROD
Fig. 22 Cooler Bypass Valve and Seal
1 - TRANSFER PLATE
2 - BYPASS VALVE
3 - SEAL
Fig. 23 Valve Body Attaching Bolts
1 - VALVE BODY
2 - VALVE BODY ATTACHING BOLTS (7)
3 - GOVERNOR TUBES
Fig. 24 Valve Body and Governor Tubes
1 - VALVE BODY ASSEMBLY
2 - GOVERNOR TUBES
21 - 42 31TH AUTOMATIC TRANSAXLERS
31TH AUTOMATIC TRANSAXLE (Continued)
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(12) Loosen low/reverse band lock nut and adjust-
ing screw to facilitate strut removal (Fig. 25).
(13) Remove low/reverse servo snap ring (Fig. 26).(14) Remove low/reverse servo retainer, spring,
and servo (Fig. 27).
(15) Remove accumulator snap ring (Fig. 28).
Fig. 25 Loosen Low/Reverse Band
1 - LOW-REVERSE BAND LEVER
2 - ADJUSTING SCREW
3 - STRUT
4 - LOW-REVERSE BAND
5 - LOCK NUT
6 - LEVER (SHORT)
Fig. 26 Low/Reverse Servo Snap Ring
1 - SNAP-RING PLIERS
Fig. 27 Remove Retainer, Spring and Servo
1 - SERVO PISTON
2 - SPRING AND RETAINER
Fig. 28 Accumulator Snap Ring
1 - ACCUMULATOR PLATE SNAP RING
2 - SNAP RING PLIERS
3 - ACCUMULATOR PLATE
RS31TH AUTOMATIC TRANSAXLE21-43
31TH AUTOMATIC TRANSAXLE (Continued)
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