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7A3-8
1977 PONTIAC SERVICE MANUAL
Slips 1-2 shift
-
(install pressure
gage).
1. Oil level low.
2. Oil pressure.
3. 2-3 accumulator.
4. 1-2 accumulator
5. Pump to case
gasket.
6. Case
7. Intermediate clutch.
1. Add oil.
2a. Vacuum modulator assembly
inoperative.
b. Modulator valve sticking.
c. Pump pressure regulator
valve.
3. Oil ring damaged or missing.
4. Oil ring missing or damaged,
case bore damaged.
5. Mispositioned.
6. Porosity between channels.
7. Piston seals missing or
damaged; clutch plates burned.
Rough 1-2 shift
-
(install pressure
gage)
1. Oil pressure.
2. Case
3. 1-2 accumulator
assembly.
la. Vacuum modulator
-
check
for loose fittings, restrictions
in line.
b. Modulator valve stuck.
c. Valve body
-
regulator or
boost valve stuck.
d. Pump to case gasket
-
off
location or damaged.
2. Porosity between channels.
3a. Oil rings damaged.
b. Piston stuck.
c. Broken or missing spring.
d. Bore damaged.
e. Check accumulator feed
hole in valve body plate.
Slips 2-3 shift
-
(install pressure
gage)
1. Oil level low.
2. Oil pressure low.
3. Case
4. Direct clutch.
1. Add oil.
2a. Modulator assembly.
b. Modulator valve.
c. Pump pressure regulator
valve or boost valve pump
to case gasket off location.
3. Porosity.
4. Piston seals leaking, or
ball check leak.
Rough 2-3 shift
-
(install pressure
gage).
1.
Oil pressure high.
2. 2-3 accumulator
assembly.
la. Vacuum leak.
b. Modulator valve sticking.
c. Valve body
-
pressure
regulator or boost valve
inoperative.
2a. 2-3 accumulator spring
missing, broken.
b. Accumulator piston stuck.
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