Page 1569 of 2321

OIL PUMP CLEARANCE
Description Metric Standard
Outer Gear-to-Pocket 0.045-0.141mm 0.0018-0.0056 in.
Outer Gear Side Clearance 0.020-0.046mm 0.0008-0.0018 in.
Inner Gear Side Clearance 0.020-0.046mm 0.0008-0.0018 in.
THRUST WASHERS
Description Metric Standard
Reaction Shaft Support (No. 1) 1.55-1.60 mm 0.061-0.063 in.
Rear Clutch Retainer (No. 2) 1.55-1.60 mm 0.061-0.063 in.
Output Shaft (No. 3) (Select) 1.98-2.03 mm 0.077-0.080 in
Output Shaft (No. 3) (Select) 2.15-2.22 mm 0.085-0.087 in.
Output Shaft (No. 3) (Select) 2.34-2.41 mm 0.092-0.095 in.
Front Annulus (No. 4) 2.95-3.05 mm 0.116-0.120 in.
Front Carrier (Nos. 5&6) 1.22-1.28 mm 0.0948-0.050 in.
Sun Gear-Front (No. 7) 0.85-0.91 mm 0.033-0.036 in
Sun Gear-Rear (No. 8) 0.85-0.91 mm 0.033-0.036 in.
Rear Carrier (Nos. 9&10) 1.22-1.28 mm 0.0948-0.050 in.
Rev. Drum (No. 11) 1.55-1.60 mm 0.061-0.063 in.
TORQUE SPECIFICATIONS
Description N´m Ft. Lbs. In. Lbs.
Bolt, Differential Bearing
Retainer-to-Case34 Ð 300
Bolt, Differential
Cover-to-Case19 Ð 165
Bolt, Differential Ring
Gear-to-Case95 70 Ð
Bolt, Extension Housing-
to-Case28 Ð 250
Bolt, Drive Plate-to-
Crankshaft95 70 Ð
Bolt, Drive Plate-to-Torque
Converter68 50 Ð
Bolt, Governor-to-Support 7 Ð 60
Bolt, Output Gear Strap 23 17 Ð
Bolt, Oil Pan-to-Case 19 Ð 165
Bolt, Oil Pump-to-Case 31 Ð 275
Bolt, Park Rod Support-to-
Case28 Ð 250
Bolt, Reaction Support-to-
Pump Body28 Ð 250
Bolt, Sprag Retainer-to-
Case28 Ð 250
21 - 72 AUTOMATIC - 31THRS
AUTOMATIC - 31TH (Continued)
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Page 1570 of 2321
Description N´m Ft. Lbs. In. Lbs.
Bolt, Starter Motor-to-
Transaxle54 40 Ð
Bolt, Transaxle Case-to-
Engine Block95 70 Ð
Bolt, Transfer Gear
Cover-to-Case19 Ð 165
Bolt, Transfer Gear Strap 23 17 Ð
Bolt, Valve Body-to-Case 12 Ð 105
Fitting, Transaxle Oil
Cooler-to-Case7Ð60
Screw, Fluid Filter 5 Ð 45
Screw, Cooler Bypass
Valve-to-Transfer Plate5Ð40
Screw, Governor
Counterweight28 Ð 250
Screw, Manual Valve
Lever-to-Shaft12 Ð 105
Screw, Speedo Adapter-
to-Extension Housing7Ð60
Screw, Valve Body-to-
Transfer Plate5Ð45
Nut, Kickdown Band
Adjuster Lock47 35 Ð
Nut, Output Gear-to-Shaft 271 200 Ð
Nut, Reverse Band
Adjuster Lock14 Ð 125
Nut, Transfer Gear-to-
Shaft271 200 Ð
Plug, Pressure Tap 5 Ð 45
Plug, Rear Band Lever
Pivot Shaft7Ð60
Switch, Park/Neutral 34 25 Ð
RSAUTOMATIC - 31TH21-73
AUTOMATIC - 31TH (Continued)
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SPECIAL TOOLS
31TH AUTOMATIC TRANSAXLE
Adapter Blocks C-293±45
Adapter Blocks C-293±52
Puller Press C-293±PA
Pressure Gauge (High) C-3293SP
Dial Indicator C-3339
Spring Compressor C-3575-A
Band Adjusting Adapter C-3705
Oil Pump Puller C-3752
Throttle Setting Gauge C-3763
Seal Puller C-3981B
21 - 74 AUTOMATIC - 31THRS
AUTOMATIC - 31TH (Continued)
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Universal Handle C-4171
Seal Installer C-4193A
Bearing Installer C-4637
Adapter C-4658
Torque Tool C-4995
Adapter C-4996
Remover Kit L-4406
Bearing Remover Cup L-4406±1
Bearing Remover Jaws L-4406±2
RSAUTOMATIC - 31TH21-75
AUTOMATIC - 31TH (Continued)
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Page 1573 of 2321
Adapter L-4406±3
Gear Puller L-4407A
Puller L-4407±6
Bearing Installer L-4408
Bearing Installer L-4410
Bearing Installer L-4411
Installer Adapter L-4429-3
Gear Checking Plate L-4432
Gear Removing Plate L-4434
Bearing Puller L-4435
21 - 76 AUTOMATIC - 31THRS
AUTOMATIC - 31TH (Continued)
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Differential Tool L-4436A
Housing Remover Adapter L-4437
Starter Nut L-4439
Transfer Shaft Remover-Installer L-4512
Bearing Cup Remover L-4517
Special Jaw Set L-4518
Installer L-4520
End Play Socket Set 8266
Bearing Splitter P-334
RSAUTOMATIC - 31TH21-77
AUTOMATIC - 31TH (Continued)
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Page 1575 of 2321

ACCUMULATOR
DESCRIPTION
The accumulator (Fig. 105) is a hydraulic device
that has the sole purpose of cushioning the applica-
tion of a band or clutch. The accumulator consists of
a dual-land piston and a spring located in a bore in
the transmission case.
OPERATION
Line pressure is directed between the lands of the
piston (Fig. 106), bottoming it against the accumula-
tor plate. The accumulator stays in this position after
the transmission is placed into a Drive position.
When the 1-2 upshift occurs (Fig. 107), line pressure
is directed to the large end of the piston and then to
the kickdown servo. As the line pressure reaches the
accumulator, the combination of spring pressure and
line pressure forces the piston away from the accu-
mulator plate. This causes a balanced pressure situ-
ation, which results in a cushioned band application.
After the kickdown servo has become immovable, line
pressure will finish pushing the accumulator up into
its bore. When the large end of the accumulator pis-
ton is seated in its bore, the band or clutch is fully
applied.
NOTE: The accumulator is shown in the inverted
position for illustrative purposes.
Fig. 105 Accumulator
1 - ACCUMULATOR PISTON
2 - PISTON SPRINGFig. 106 Accumulator in Neutral and Drive Positions
Fig. 107 Accumulator in Second Gear Position
1 - BOTTOM IN BORE
2 - SHUTTLE VALVE
21 - 78 AUTOMATIC - 31THRS
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Page 1576 of 2321

BANDS
KICKDOWN (FRONT) BAND
DESCRIPTION
The kickdown, or ªfrontº, band (Fig. 108) holds the
common sun gear of the planetary gear sets. The
front (kickdown) band is made of steel, and faced on
its inner circumference with a friction-type lining.
One end of the band is anchored to the transmission
case, and the other is acted on with a pushing force
by a servo piston. The front band is a single-wrap
design (the band does not completely encompass/
wrap the drum that it holds).
OPERATION
The kickdown band holds the common sun gear of
the planetary gear sets by applying and holding the
front clutch retainer, which is splined to the sun gear
driving shell, and in turn splined directly to the sun
gear. The application of the band by the servo is typ-
ically done by an apply lever and link bar.
LOW/REVERSE (REAR) BAND
DESCRIPTION
The low/reverse band, or ªrearº, band (Fig. 109) is
similar in appearance and operation to the front
band. The rear band is also a single-wrap design (
the band does not completely encompass/wrap the
drum that it holds).
OPERATION
The rear band holds the rear planet carrier sta-
tionary by being mounted around and applied to the
low/reverse drum.
ADJUSTMENT - FRONT BAND
The front (kickdown) band adjusting screw is
located on the left side of the transmission case
above the manual valve and throttle valve levers.
(1) Disconnect battery negative cable.
(2) Remove air cleaner assembly.
(3) Loosen band adjusting screw locknut (Fig. 110).
Then back locknut off 3-5 turns. Be sure adjusting
screw turns freely in case. Apply lubricant to screw
threads if necessary.
(4) Tighten band adjusting screw to 8 N´m (72 in.
lbs.).
Fig. 108 Front BandÐTypical
1 - FRONT BAND
2 - TRANSMISSION HOUSING
Fig. 109 Rear Band
1 - PLANETARY GEARTRAIN
2 - REAR BAND
3 - LEVER
4 - SERVO
5 - ADJUSTER
Fig. 110 Front (Kickdown) Band Adjustment
Location
1 - KICKDOWN BAND ADJUSTING SCREW
RSAUTOMATIC - 31TH21-79
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