GMC 1989 Light Duty Truck, Repair Manual, Page: 766 / 998

7A2-6 400/475 AUTOMATIC TRANSMISSION
6 5
BOLT, H E X H D 5 / 1 6 - 1 8 X .6 2 ( S E R V O C O V E R T O C A S E )
6 6
C O V E R , R E A R S E R V O
6 7
G A S K E T , R E A R S E R V O C O V E R
6 8
RIN G , R E T A I N I N G ( S E R V O P I S T O N )
6 9
P I S T O N , A C C U M U L A T O R ( R E A R S E R V O )
7 0
S E A L , R E V E R S E S E R V O P I S T O N
71
RIN G , OIL S E A L ( A C C U M U L A T O R P ' S T O N - O U T E R )
7 2
P I S T O N , A C C U M U L A T O R
7 3
RI N G , OIL S E A L ( A C C U M U L A T O R P I S T O N - INNER)
7 4 W A S H E R , S E R V O A S S E M B L Y
7 5 S P R I N G , R E A R S E R V O
7 6 R E T A I N E R , R E A R S E R V O S P R I N G
7 7
PIN, R E A R B A N D A P P L Y
7 8
S P R I N G , R E A R A C C U M U L A T O R
__________________________________________ H H 0 0 2 7 4 0 0
Figure 8 - Rear S ervo A ss e m b ly
Figure 9 - In s ta llin g S ervo Pin Gage
J 2 1 3 7 0 - 1 0 .
u
G A G I N G S T E P S L O C A T E D O N
T H R E E S I D E S O F T O O L
J H 0 1 6 0 -4 0 0
Figure 10 - Gage Pin
Case E xtension A ssem bly
B Remove or Disconnect (Figure 15)
1. Bolts (23) a n d /o r nuts (24) extension (27).
2. Rear seal (26), bearings (28), spacer (29), snap
ring (31), seal (32) and bushings (30 and 33).
Rear U n it End Play C heck
Measure (Figures 16 and 17)
T ools Required:
J 21797 Bolt
J 8001 D ial Indicator
1. Attach J 21797 to one o f the bolt holes at the end
o f the transmission case (10).
2. M ount J 8001 on the bolt and index it to the end
o f the output shaft (691).
set the indicator to "0".
3. M ove the output shaft in and out noting the
amount o f end play.
correct end play is between .007" and .019"
(.178 - .483 mm)
H H 0 0 2 9 -4 0 0 -R 1