Page 3065 of 4284
INSTALLATION
(1) Fish gear shift cable dash panel opening into
engine compartment and secure grommet (Fig. 175).
Fig. 172 PRNDL Cable
1 - PRNDL CABLE
2 - GEAR SHIFT LEVER
Fig. 173 Gearshift Cable at Column
1 - GEAR SHIFT CABLE
Fig. 174 Gearshift Cable/Grommet at Dash Panel
1 - CABLE GROMMET
2 - DASH PANEL
Fig. 175 Gearshift Cable/Grommet at Dash Panel
1 - CABLE GROMMET
2 - DASH PANEL
RSAUTOMATIC - 31TH21 - 101
GEAR SHIFT CABLE (Continued)
Page 3066 of 4284
(2) Install gear shift cable through column bracket
(Fig. 176) until audible ªclickº is heard.
(3) Connect gear shift cable to gear shift lever (Fig.
176).
(4) Connect PRNDL cable to gear shift lever (Fig.
177). Adjust if necessary.(5) Install knee bolster (Fig. 178).
(6) Install instrument panel lower silencer (Fig.
179).
(7) Install gear shift cable to transaxle upper
mount bracket (Fig. 180). An audible ªclickº should
be heard.
(8) Connect gear shift cable end to transaxle man-
ual valve lever (Fig. 180).
(9) Adjust gearshift cable. (Refer to 21 - TRANS-
MISSION/TRANSAXLE/AUTOMATIC - 31TH/GEAR
SHIFT CABLE - ADJUSTMENTS)
Fig. 176 Gearshift Cable at Column
1 - GEAR SHIFT CABLE
Fig. 177 PRNDL Cable
1 - PRNDL CABLE
2 - GEAR SHIFT LEVER
Fig. 178 Knee Bolster
1 - KNEE BOLSTER
Fig. 179 Instrument Panel Lower Silencer
1 - INSTRUMENT PANEL LOWER SILENCER
21 - 102 AUTOMATIC - 31THRS
GEAR SHIFT CABLE (Continued)
Page 3067 of 4284

GEARSHIFT CABLE ADJUSTMENT
Lift and rotate the gearshift hand lever into the
park (P) gate position and remove the ignition key.
This confirms the shift lever is in the gated park (P)
position.
After confirming the park gate position, turn the
ignition switch . If the starter will operate, the park
gate position is correct. Move the shift lever into the
neutral (N) position. If the starter will operate in this
position, the linkage is properly adjusted. If the
starter fails to operate in either position, linkage
adjustment is required.
(1) Park the vehicle on level ground and set the
parking brake.
(2) Place the gearshift lever in park (P) gate posi-
tion and remove key.
(3) Loosen the cable adjustment screw at the
transaxle operating lever (Fig. 181).
(4) Pull the transaxle operating lever fully forward
to the park detent position.
(5) Release the park brake, then rock the vehicle
to assure it is in park lock. Reset the park brake.
(6) Tighten the cable adjustment screw to 8 N´m
(70 in. lbs.). Gearshift cable should now be properly
adjusted.
(7) Verify PRNDL indicator still displays the corre-
sponding gear completely. If not, readjustment of
PRNDL may be required.(8) Check adjustment by using the preceding pro-
cedure.
GOVERNOR
DESCRIPTION
The governor assembly is fastened to the transaxle
transfer shaft. It consists of a governor body, weight,
valve, and shaft.
OPERATION
The governor meters hydraulic pressure, and this
metered pressure is used to signal the transmission
when it is time for a shift to occur. It does this by
balancing governor pressure on one side of a shift
valve, and throttle pressure on the other. When gov-
ernor pressure increases far enough to overcome the
throttle pressure on the valve, a shift occurs.
With the gearshift selector in a forward driving
range, line pressure flows from the manual valve and
down to the governor valve. When the output shaft
starts to rotate with vehicle motion, the governor
weight assembly will start to move outward due to
centrifugal force. As the weight is moved outward, it
will pull the valve with it until the land of the valve
uncovers the line pressure port. As the port begins to
become uncovered, governor pressure is metered. As
the vehicle's speed continues to increase, the weight
assembly will be at a point at which governor pres-
sure is acting on the left side of the reaction area of
the valve. This produces sufficient force to compress
the spring and allow the outer weight to move out
against the outer governor body retaining ring. At a
very high speed, the governor valve will be opened as
far as possible. In this condition, it is possible for
governor pressure to meet, but not to exceed, line
Fig. 180 Gearshift Cable at Transaxle
1 - MANUAL VALVE LEVER
2 - GEAR SHIFT CABLE
3 - UPPER MOUNT BRACKET
Fig. 181 Gearshift Cable Adjustment
1 - SHIFT CABLE ADJUSTMENT
2 - SHIFT CABLE
RSAUTOMATIC - 31TH21 - 103
GEAR SHIFT CABLE (Continued)
Page 3068 of 4284

pressure. Generally governor pressure ranges from
0-100 psi from idle to maximum speed, and rises pro-
portionally with the increase in output shaft speed.
Governor pressure and throttle pressure are acting
upon the shift valves to determine when a shift will
occur. Governor pressure is a direct indication of road
speed, and throttle pressure is an indication of
engine load. When both parameters have been met
by the throttle and governor pressures, an upshift or
downshift will occur.
CLEANING
Thoroughly clean all the governor parts in a suit-
able cleaning solution but do not use any type of
caustic cleaning agents.
The governor weight components and the governor
valve, must slide freely in their bores when clean and
dry. Minor surface scratches and burrs can be
smoothed with crocus cloth.
INSPECTION
The aluminum governor valve and outer weight
have a hard coating on them. Check condition of this
coating carefully. Do not reuse either part if the coat-
ing is damaged.
Inspect the governor weight spring for distortion.
Replace the spring, if distorted, collapsed, or broken.
Clean the filter in solvent and dry it with compressedair. Replace the filter, if damaged. Inspect the park
gear for chipped or worn gear teeth or damaged ring
grooves. Replace the gear, if damaged.
Check the teeth on the park gear for wear or dam-
age. Replace the gear if necessary. Inspect the metal
seal rings on the park gear hub. Replace the rings
only if severely worn, or broken.
OIL PUMP
DESCRIPTION
The oil pump is located in the pump housing inside
the bell housing of the transmission case. The oil
pump consists of an inner and outer gear, a housing,
and a cover that also serves as the reaction shaft
support (Fig. 182).
OPERATION
As the torque converter rotates, the converter hub
rotates the inner and outer gears. As the gears
rotate, the clearance between the gear teeth
increases in the crescent area, and creates a suction
at the inlet side of the pump. This suction draws
fluid through the pump inlet from the oil pan. As the
clearance between the gear teeth in the crescent area
decreases, it forces pressurized fluid into the pump
outlet and to the valve body.
Fig. 182 Oil Pump Assembly
1 - REACTION SHAFT SUPPORT
2 - INNER GEAR
3 - PUMP BODY4 - PUMP BUSHING
5 - OUTER GEAR
21 - 104 AUTOMATIC - 31THRS
GOVERNOR (Continued)
Page 3069 of 4284

STANDARD PROCEDURE - OIL PUMP VOLUME
CHECK
Measuring the oil pump output volume will deter-
mine if sufficient oil flow to the transmission oil
cooler exists, and whether or not an internal trans-
mission failure is present.
Verify that the transmission fluid is at the proper
level. Refer to the Fluid Level Check procedure in
this section. If necessary, fill the transmission to the
proper level with Moparž ATF +4, type 9602, Auto-
matic Transmission Fluid.
(1) Using hose cutters or a suitable blade, cut the
To coolerline off flush with the cooler inlet fitting
and place a collecting container under the open line.
CAUTION: With the fluid set at the proper level,
fluid collection should not exceed (1) quart or inter-
nal damage to the transmission may occur.
(2) Run the engineat curb idle speed, with the
shift selector in neutral.
(3) If one quart of transmission fluid is collected in
the container in 20 seconds or less, oil pump flow vol-
ume is within acceptable limits. If fluid flow is inter-
mittent, or it takes more than 20 seconds to collect
one quart of fluid, (Refer to 21 - TRANSMISSION/
TRANSAXLE/AUTOMATIC - 31TH - DIAGNOSIS
AND TESTING) for further diagnosis.
(4) Re-connect theTo coolerline to the transmis-
sion cooler inlet using a service splice kit. Refer to
instructions included with the kit.
(5) Refill the transmission to proper level. (Refer
to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC
- 31TH/FLUID - STANDARD PROCEDURE)
DISASSEMBLY
(1) Remove reaction shaft support-to-pump body
bolts.
(2) Remove reaction shaft support, and the inner
and outer pump gears (Fig. 183).
CLEANING
Clean pump and support components with solvent
and dry them with compressed air.
INSPECTION
(1) Check condition of the seal rings and thrust
washer on the reaction shaft support. The seal rings
do not need to be replaced unless cracked, broken, or
severely worn.
(2) Visually inspect the pump and support compo-
nents. Replace the pump assembly if the seal ring
grooves or machined surfaces are worn, scored, pit-
ted, or damaged. Replace the pump assembly if the
gears if pitted, worn chipped, or damaged.
(3) Inspect the pump bushing. Then check the
reaction shaft support bushing. Replace the pump
assembly if either bushing is heavily worn, scored or
damaged.
(4) Clearance between outer gear and reaction
shaft housing should be 0.010 to 0.063 mm (0.0004 to
0.0025 in.). Clearance between inner gear and reac-
tion shaft housing should be 0.010 to 0.063 mm
(0.0004 to 0.0025 in.). Both clearances can be mea-
sured at the same time by installing the gears in the
pump body and measure pump component clearances
as follows:
(5) Reinstall gears to pump body and measure
outer gear-to-pocket clearance with a feeler gauge
(Fig. 184).Outer gear-to-pocket clearance should
be within 0.045-0.141 mm (0.0018-0.0056 in.).
(6) Measure both inner and outer gear side clear-
ance with PlastigageŸ. If PlastigageŸ is not avail-
able, measure across the pump body with a straight
edge and feeler gauge.
(a) Position an appropriate piece of PlastigageŸ
across both gears.
(b) Align the plastigage to a flat area on the
reaction shaft housing.
(c) Install the reaction shaft support to the
pump housing and torque to 28 N´m (250 in. lbs.).
(d) Separate the reaction shaft housing from the
pump housing and measure the PlastigageŸ fol-
lowing the instructions supplied with it.Inner
and outer gear side clearance should be
within 0.020-0.046 mm (0.0008-0.0018 in.).
ASSEMBLY
(1) Install inner and outer gears to pump body
(Fig. 183). Lubricate gears with Moparž ATF+4
(Automatic Transmission Fluid-Type 9602).
(2) Install reaction shaft support to pump body
and align holes.
(3) Install and torque reaction shaft support-to-
pump body bolts to 28 N´m (250 in. lbs.).
RSAUTOMATIC - 31TH21 - 105
OIL PUMP (Continued)
Page 3070 of 4284

PARK/NEUTRAL POSITION
SWITCH
DIAGNOSIS AND TESTING - PARK/NEUTRAL
POSITION SWITCH
The park/neutral starting switch is the center ter-
minal of the 3 terminal switch. It provides ground for
the starter solenoid circuit through the selector lever
in only Park (P) and Neutral (N) positions.
(1) To test switch, remove wiring connector from
switch and test for continuity between center pin of
switch and transaxle case. Continuity should exist
only when transaxle is in Park or Neutral.
(2) Check gearshift cable adjustment before replac-
ing a switch which tests bad.
REMOVAL
(1) Unscrew switch from transaxle case allowing
fluid to drain into a container. Move selector lever to
Park, then to Neutral position, and inspect to see the
switch operating lever fingers are centered in switch
opening.
Fig. 183 Oil Pump Assembly
1 - REACTION SHAFT SUPPORT
2 - INNER GEAR
3 - PUMP BODY4 - PUMP BUSHING
5 - OUTER GEAR
Fig. 184 Measuring Pump Outer Gear-to-Pocket
Clearance
1 - FEELER GAUGE
2 - OUTER GEAR
21 - 106 AUTOMATIC - 31THRS
OIL PUMP (Continued)
Page 3071 of 4284

INSTALLATION
(1) Screw the switch with a new seal into trans-
axle case and tighten to 33 N´m (24 ft. lbs.). Retest
switch with the test lamp.
(2) Add fluid to transaxle to bring up to proper
level.
(3) The back-up lamp switch circuit is through the
two outside terminals of the 3 terminal switch.
(4) To test switch, remove wiring connector from
switch and test for continuity between the two out-
side pins.
(5) Continuity should exist only with transaxle in
Reverse position.
(6) No continuity should exist from either pin to
the case.
PLANETARY GEARTRAIN
DISASSEMBLY
(1) Remove snap ring and #4 thrust washer (Fig.
185)
(2) Remove annulus gear support front snap ring
(Fig. 186).
(3) Remove annulus gear support and snap ring
(Fig. 187).(4) Remove remaining snap ring (Fig. 188).
(5) Remove and inspect front planetary carrier
assembly (Fig. 189).
ASSEMBLY
(1) Install front planetary gear assembly to annu-
lus gear (Fig. 190).
Fig. 185 Front Planetary Gear Snap Ring and No. 4
Thrust Washer
1 - SNAP RING
2 - #4 THRUST WASHER
3 - SNAP RING
4 - FRONT PLANETARY GEAR ASSEMBLY
Fig. 186 Annulus Gear Support Front Snap Ring
1 - ANNULUS GEAR SUPPORT
2 - FRONT SNAP RING
3 - SCREWDRIVER
4 - FRONT PLANETARY ANNULUS GEAR
Fig. 187 Front Annulus Gear Support and Snap Ring
1 - FRONT ANNULUS GEAR
2 - FRONT SNAP RING
3 - FRONT ANNULUS GEAR SUPPORT
4 - REAR SNAP RING
RSAUTOMATIC - 31TH21 - 107
PARK/NEUTRAL POSITION SWITCH (Continued)
Page 3072 of 4284
(2) Install first support snap ring (Fig. 191).
(3) Install annulus gear support and snap ring
(Fig. 192).
Fig. 188 Front Annulus Gear Support Snap Ring
1 - FRONT ANNULUS GEAR
2 - REAR SNAP RING
Fig. 189 Front Planetary Gear
1 - FRONT PLANETARY GEAR ASSEMBLY
Fig. 190 Front Planetary Gear
1 - FRONT PLANETARY GEAR ASSEMBLY
Fig. 191 Front Annulus Gear Support Snap Ring
1 - FRONT ANNULUS GEAR
2 - REAR SNAP RING
Fig. 192 Front Annulus Gear Support and Snap Ring
1 - FRONT ANNULUS GEAR
2 - FRONT SNAP RING
3 - FRONT ANNULUS GEAR SUPPORT
4 - REAR SNAP RING
21 - 108 AUTOMATIC - 31THRS
PLANETARY GEARTRAIN (Continued)