GMC 1989 Light Duty Truck, Repair Manual, Page: 728 / 998

7A1-32 700-R4 AUTOMATIC TRANSMISSION
the flange on the retainer ring must face
away from the retainer. ^
3. Race and retainer assembly inro the sprag
assembly
to assemble, hold the outer race in your left
hand with your fingers supporting the sprag
at the recessed side o f the outer race,
insert the race and retainer assembly by
pushing in and turning to the left.
4. The remaining retainer ring onto the sprag
assembly
5. Overrun clutch hub (639)
6. Overrun clutch hub retaining snap ring (638) into
the snap ring groove o f the race and retainer
assembly
7. Test the assembly for proper operation as shown
(Figure 72).
If the assembly operates backwards, you
have installed the sprag backwards.
Reassemble correctly.
I
Figure 7 0 Spraig A s s e m b ly P ro ce d u re
Figure 71 S prag Race and R e ta in e r A sse m b ly
P ro ce d u re
.A#'
A PUSH IN A N D T U R N C O U NTERCLOCKW ISE
TO IN S T A L L
641 R E T A IN E R & RACE A SS E M B LY , SPRAG
642 FORW ARD SPRAG A SSEM BLY
643 R E T A IN E R R INGS, SPRAG ASS E M B LY
644
RACE, FORW ARD C L -
OUTER
____________________________________________________ J H 0 1 19 -7 0 0 R 4
A RECESSED FACE
B NOTCHES POINT UPWARD AS SHOWN
C LIPPED EDGE
642 FORW ARD SPRAG ASSEM BLY
644 RACE, FORW ARD C L U T C H -O U T E R
I
___________________________ I_______________________ J H 0 1 1 8 -7 0 0 R 4
*
Figure 7 2 C heck S prag fo r P ro p e r O p e ra tio n
Assemble
Forward clutch sprag assem bly into the input
clutch housing
index the overrun clutch hub into the
overrun clutch plates.
Inspect (Figure 73 and 74)
• Forward (649) and 3-4 clutch plates (654)
Com position plates for damaged tangs,
delam ination, or wear
Steel plates for damaged tangs, wear, or
heat damage
• Forward (650) and 3-4 clutch backing plates
(655) for
flatness
surface finish damage
burrs or nicks
• Forward clutch apply plate (646) and spacer plate
(647) for
flatness
surface finish damage
burrs or nicks
• The 3-4 clutch apply plate (653) for
flatness
surface finish damage
• The 3-4 clutch ring retainer plate (652) for
bent tangs
flatness
*
Assemble (Figures 73, 74, 75 and 76)
1. Forward clutch apply plate (646) into the input
clutch housing
index as shown.
2. W aved steel forward clutch plate (648) into the
input clutch housing
index as shown.
3. The remaining forward clutch plates (649) into
the input clutch housing
start with a steel plate and alternate with
com position
THE O V E R R U N CLUTCH HUB MUST T U R N
CLOCKW ISE, BUT NOT CO U NTERC LO C KW ISE
639 HUB, O V E R R U N .C L „ _
644 RACE, FORW ARD C L -
OUTER
JH0120-700R4