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7A1-50
1977 PONTIAC SERVICE MANUAL
FEELER STOCK THICKNESS
I
SPACER
NUMBER
SPACER THICKNESS
3.85mm-3.75mm (.152"-.148")
3.45mm-3.35mm (.136"-.132")
3.05mm-2.95mm (.120"-.116")
2.65mm-2.55mm (.104"-.loo")
2.25mm-2.15mm (.089"-.085")
1.85mm-1.75mm (.073"-.069")
3876
Fig. 7A1-98A Low and Reverse Clutch Selective Spacer Chart
f. Remove J 25023 (Fig. 7A1-97).
g. Install proper low and reverse clutch selective spacer
in the case ( ~ i ~ .
7 ~ 1 - 9 9 ) .
4. Install low and reverse clutch housing to case snap
ring, flat side against housing (beveled side up), and position
snap ring gap on opposite side of parking brake rod.
Fig. 7A1-99 Installing Selective Spacer
Installation
1. Oil and install the low and reverse clutch plates into
the case, starting with a flat steel and alternating
composition-faced and flat steel clutch plates (see Clutch
Plate and Apply Ring Usage chart, Fig. 7A1-98B).
2. Install low and reverse clutch housing to case spacer
ring in case (Fig. 7A1-100).
3. Install low and reverse clutch housing assembly
aligning reverse clutch housing feed hole to reverse clutch
case feed passage, using J 250 12 (Fig. 7A 1-101). If the low
and reverse clutch housing does not seat past the case snap
ring groove, proceed as follows:
a. Remove tool J 25012.
b. Using rear sun gear and input drum as a tool, install
input drum and rear sun gear in case.
c. Rotate rear sun gear back and forth, tapping lightly
with input drum, to align roller clutch race and low and
reverse clutch hub splines (Fig. 7A1-102).
d. Remove tool (input drum and rear sun gear).
NOTE: It may be necessary to loosen adjusting screw
on J 25013-5 on output shaft to install snap ring.
e. Repeat the above steps if low and reverse clutch
housing is not fully seated past case snap ring groove.
FRONT GEAR PARTS
Rear Sun Gear and Input Drum (Fig. 7A1-103)
Inspection
1. Inspect rear sun gear for cracks, splits, damage spline,
worn gear or hournals and plugged lubrication holes.
2. Inspect rear sun gear bushing for damage or scoring.
3. If necessary, remove input drum to rear sun gear snap
ring and remove sun gear from input drum.
4. Inspect input drum for damage.
5. Inspect 4 tanged input drum to low and reverse clutch
housing thrust washer for scoring or distorted tangs.
6. If damaged, replace rear sun gear to input drum snap
ring.
Reassembly
1. Install rear sun gear into input dru'm, spline side first,
and retain with snap ring.
2. Install 4 tanged thrust washer on input drum over sun
gear end; align tangs into input drum and retain with
petrolatum (Fig. 7A 1- 104).
3. Install rear sun gear and input drum assembly (Fig.
7Al- 102).
Front Sun Gear
1. Inspect front sun gear splines and teeth for damage
or wear.
2. Inspect machined face for pitting, scoring or damage.
3. Install front sun gear face with the identification mark
(a drill spot or groove) against input drum to rear sun gear
snap ring (Figs. 7A1-105 and 106).
4. Thoroughly clean, air dry and inspect front sun gear
to front carrier thrust race and thrust bearing for pitted or
rough conditions.
5. Install front sun gear to front carrier thrust bearing
and race assembly with roller thrust bearing against the front
sun gear (Fig. 7A1-107).
NOTE: This thrust bearing requires only
1
thrust race.
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