Pontiac TRANS AM 1977 Service Manual page 917

TURBO HYDRA-MATIC 200 7A1-17
D. Case 1. Cross leakage to forward
clutch passages.
NO DRIVE IN REVERSE
OR SLIPS IN REVERSE.
(REFER TO OIL PRES-
SURE CHECKS.)
A. Throttle valve cable. 1. Binding or misadjusted.
B. Manual linkage 1. Misadjusted
C. Pump assembly
1. Pressure regulator valve
binding or stuck with chips.
2. Check ball missing or mis-
located.
3. Pump to case gasket mis-
located or damaged.
4. Direct clutch feed holes
leaking, cross feeding or not
drilled.
5. Cup plugs missing.
6. Oil rings damaged or
missing.
D. Control Valve asm.
1. Throttle valve binding.
2. Shift T.V. valve binding.
3. Reverse boost valve binding.
4. Lo overrun clutch valve
binding. (Line presure readings
will be normal.)
E. Valve body spacer
plate and gaskets
1. Orifices plugged.
2. Control valve assembly
gaskets in reverse order.
F. Case Assembly 1. Lo and reverse clutch
housing-to-case seal or cup
plug missing, damaged or no
feed hole in cup plug. Also,
seal may not be seated against
the housing.
2. Porosity in case passages
-
direct clutch feed.
G. Direct clutch asm. 1. Piston or housing cracked.
2. Piston seals cut or missing.
3. Check ball in housing and/
or piston stuck, leaking
or missing.
4. Plates burned.
5. Incorrect piston.
6. Clutch release spring guide
mis-located, preventing check
ball in the piston from
seating, causing plates to
bum.
H. Lo & Reverse clutch 1. Piston
-
cracked, broken or
assembly missing seals. Clutch plates burned.
2. Wrong selective spacer ring.