Chevrolet 1977 10 Series, Repair Manual, Page: 329 / 468

AUTOMATIC TRANSMISSIONS
(400)7A-9
Fig. 7 A - 2 7 C -- R e m ov in g Rear Oil Seal fr o m Case Extension
Removal of Rear Oil Seal and Case Extension
1. If necessary to replace, pry rear oil seal from case
extension (Fig. 7A-27C).
2. Remove case extension to case attaching bolts.
3. Remove case extension to case gasket (Fig. 7A-28C).
4. Make front unit end play check as follows (Fig. 7A-
29C):
a. Remove one front pum p attaching bolt, and bolt
washer. (See Fig. 7A-29C for location).
b. Install a 3/8"-16 threaded slide hammer bolt or J-
9539, into bolt hole.
Fig. 7 A - 2 9 C -- C h e c k in g Fro n t U n it End Play
c. M ount a dial indicator on rod and index indicator to
register with end of turbine shaft.
d. Push on turbine shaft rearward.
e. Push output shaft forward.
f. Set dial indicator to Zero.
g. Pull turbine shaft forward.
Read resulting travel or end play. Should be .003 "-.024".
Selective washer controlling this end play is the washer
located between pum p cover and forward clutch housing. If
more or less washer thickness is required to bring end play
within specifications, select proper washer from the chart
shown in Fig. 7A-30C.
NOTE:
An oil soaked washer may tend to discolor, so
it will be necessary to measure washer for its actual
thickness.
FR O N T END WASHER THICKNESS
Thickness
Color
.060 - .064
Y ellow
.071 - .075 Blue
.082 - .086
Red
.093 - .097
Brown
.104 - .108
Green
.115 - .119 Black
.126 - .130
Purple
DIAL
IN D IC A T O R
J -8 0 0 1
Fig. 7A-28C--Case Extension and Gasket
Fig. 7A -3 0C -Fro nt End Washe r Selection Chart