GMC 1989 Light Duty Truck, Repair Manual, Page: 740 / 998

7A1-44 700-R4 AUTOMATIC TRANSMISSION
Figure 1 0 2 Oil Pum p and Case
J H 0 1 4 7 7 0 0 R 4
A A L IG N M E N T PINS
7 O IL PUMP ASSEM BLY
properly the turbine shaft should turn by
hand. If not identify and correct the
misassembly now.
Transmission End Play Check
2
.
3.
4.
*
Measure (Figures 103,104,105,106)
TOOLS R E Q U IR E D :
J-24773-A End Play Checking Fixture
J-25022 End Play Checking Fixture
Adaptor (245 mm)
J-34725 End Play Checking Fixture
Adaptor (298 mm)
278 mm (11 in.) Bolt and N ut or
J-25025-7A Post
D ial Indicator
Rem ove an oil pump to case bolt and install a 278
mm (11 in.) bolt and lock nut or J-25025-7A.
Install J-25022-A or J-34725 as shown.
Install J-24773-A as shown.
Install a dial indicator.
set to zero.
Pull up on J-24773-A.
End play should be 0.13 - 0.92 mm (.005 -
.036 in.).
The selective washer which controls end
play is located between the input housing
and the thrust bearing on the oil pump hub.
If more or less end play is required, select
the proper washer from the chart and
install. If dial indicator shows no end play,
the selective washer and thrust bearing have
been misassembled.
Assemble (Figure 107)
1. “O ” ring seal (618) into the groove in the end o f
the turbine shaft.
Important (Figure 108)
There should be clearance between the reverse
input clutch and the reaction sun gear shell. This
clearance can be observed at the point shown in
Figure 108.
Do not
try to shim the internal parts
because o f this clearance.
Inspect (Figure 110,111 and 112)
The 1-2 accum ulator cover and pin assembly (62)
for
porosity or damage
scored piston wall
plugged oil passage
1-2 accum ulator piston (61) and the 3-4
accum ulator piston (52) for
porosity
ring groove damage
pin hole damage