Pontiac FIREBIRD 1972 Service Manual page 896

7E-6 1972 PONTIAC SERVICE M A N U A L
c. Valve body gaskets leaking, damaged, incorrectly
installed.
3. Case:
a. Intermediate clutch cup plug leaking or blown
out.
b. Porosity between channels.
c. Governor feed channel blocked; governor bore
scored or worn, allowing cross pressure leak.
4. Intermediate clutch:
a. Case center support
-
oil rings missing, broken,
defective; orifice plug missing.
b. Clutch piston seals missing, improperly assem-
bled, cut.
FIRST AND SECOND SPEEDS ONLY, NO
2-3 SHIFT
1 . Detent solenoid
-
stuck open (detent shifts only
-
the
2-3 shift would occur at very high speeds, being inter-
preted as no 2-3 shift).
2. Detent switch
3. Control valve:
a. 2-3 valve train stuck.
b. Valve body gaskets leaking, damaged, incorrectly
installed.
4. Direct clutch:
a. Center support oil rings missing, broken, defec-
tive.
b. Clutch piston seals missing, improperly assem-
bled, cut; piston ball check stuck or missing.
DRIVE IN NEUTRAL
1 . Manual linkage maladjusted.
2. Internal Linkage:
a. Manual valve disconnected or end broken.
b. Inside detent lever pin broken.
3. Pump Assembly
-
transmission lube pressure leaking
into forward clutch apply passage.
4. Forward Clutch:
a. Burned plates
-
check cause.
b. Clutch doesn't release
-
will also cause no drive in
Reverse.
NO DRIVE IN REVERSE OR SLIPS IN
REVERSE
-
(INSTALL PRESSURE GAUGE)
1 . Low fluid level.
2. Manual linkage maladjusted.
3. Oil pressure
-
refer to LOW L I N E PRESSURE
above.
4. Control valve:
a. Valve body gaskets leaking, damaged, incorrectly
installed (Other malfunctions may also be in-
dicated).
b. Low reverse ball check missing from case (this
will also cause no overrun braking in Lo Range).
c. 2-3 valve train stuck open (this will also cause 1-3
upshift in Drive range).
d. Reverse feed passage restricted; also check case
passages.
5. Rear servo and accumulator:
a. Servo piston seal ring damaged or missing.
b. Short band apply pin (this may also cause no
overrun braking o r slips in overrun braking
-
Lo
range). Refer to INSTALLATION O F REAR
SERVO ASSEMBLY for pin selection proce-
dure.
c. Defective rear servo piston or bore.
6. Reverse or low band burnt, loose lining; apply pin or
anchor pins not engaged; band broken.
7. Direct clutch:
a. Outer seal damaged or missing,
b. Clutch plates burnt (see BURNED CLUTCH
PLATES below).
8. Forward clutch
-
clutch does not release (will also
cause Drive in Neutral).
9. Center support
-
oil seal rings or grooves damaged or
worn.