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TRANSMISSION-TORQUEFLITE
21 -97
for deterioration, wear, and hardness. Inspect the pis-
ton spring and snap rings for distortion.
Inspect the interlocking seal rings (Fig. 100) on the
input shaft for wear or broken locks, make sure they
turn freely in the grooves. Do not remove the rings
unless conditions warrant. Inspect the bushing in the
input shaft for wear or scores. Inspect the rear clutch
to front clutch thrust washer for wear. Washer thick-
ness should be .061 to .063 inch, replace if necessary.
Input Shaft Bushing Replacernenf
(1)
Clamp the input shaft in a vise with soft jaws,
being careful not to clamp on the seal ring lands or
bearing journals.
(2) Assemble the remover Tool SP-3630, the cup
Tool SP-3633, and the hex nut Tool SP-1191 (Fig.
101).
(3) With the cup held firmly against the clutch pis-
ton retainer, thread the remover into the bushing as
far as possible by hand.
(4) Using a wrench, screw the remover into the
bushing 3 to 4 additional turns to firmly engage the
threads in the bushing.
(5) Turn the hex nut down against the cup to pull
the bushing from the input shaft.
(6) Thoroughly clean the input shaft to remove the
chips made by the remover threads. Make certain the
small lubrication hole next to the ball in the end of
the shaft is not plugged with chips. Be sure no chips
are lodged next to the steel ball.
(7)
Slide a new bushing on the installing head Tool
SP-3636, and start them in the bore of the input
shaft.
(8)
Stand the input shaft upright on a clean smooth
surface and install handle Tool SP-3549 in the install-
ing head (Fig. 101). Drive the bushing into the shaft
until the tool bottoms.
HEX NUT
SP-1191
CUP
P-3633
REAR CLUTCH
Fig. 101-Replacing
Input Shaft Bushing
(9) Thoroughly clean the input shaft and clutch pis-
ton retainer before assembly and installation.
Assembly
(1) If
removed, press the input shaft into the
clutch piston retainer and install the snap ring.
(2) Lubricate and install the inner and outer seal
rings on the clutch piston. Make sure the lip of the
seals face toward the head of the clutch retainer, and
are properly seated in the piston grooves.
(3) Place the piston assembly in the retainer and,
with a twisting motion, seat the piston in bottom of
the retainer.
(4) Position the clutch retainer over the piston re-
tainer splines and support the assembly
so
the clutch
retainer remains in place.
(5) Place the spring over the piston with outer
edge of spring positioned below the snap ring groove.
Start one end of the snap ring in the groove, make
sure the spring is exactly centered on the piston, then
progressively tap the snap ring into the groove (Fig.
98). Be sure the snap ring is fully seated in the
groove.
(6) Install the inner pressure plate in the clutch
retainer with raised portion of the plate resting on
the spring.
(7)
Lubricate all the clutch plates, install one lined
plate followed by a steel plate until all the plates are
installed. Install the outer pressure plate and snap
ring.
NOTE: The A-727-A transmission uses three discs
and two steel plates in the rear clutch for the
318
cubic inch engine. The A-727-6 transmission uses
four discs and three steel plates in the rear clutch
with engines greater than 318 cubic inch displace-
ment.
(8)
With the rear clutch completely assembled, in-
sert
a feeler gauge between the pressure plate and
snap ring (Fig. 99). The clearance should be
.022-.042
inch for the three-disc clutch and .026-.054 inch for
the four-disc clutch. If not, install a snap ring of prop-
er thickness to obtain the specified clearance. LOW
limit clearances are desirable.
NOTE: Rear clutch plate clearance is very impor-
tant in obtaining proper clutch operation. The
clearance can be adjusted by the use of various
thickness outer snap rings. Snap rings are available
in .060-.062, .074-.076 and
.088-.090
inch thickness.
PLANETARY GEAR ASSEMBLIES, SUN
GEAR, DRIVING SHELL-A-904-G
AND
A-904-LA
Measure the end play of the planetary gear assem-
blies, sun gear and driving shell before removing
these parts from the output shaft. With the assem-
blies in an upright position, push the rear annulus
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