Pontiac FIREBIRD 1972 Service Manual page 898

7E-8 1972 PONTIAC SERVICE MANUAL
ROUGH 2-3 SHIFT
-
(INSTALL PRESSURE
GAUGE)
1. Oil pressure
-
refer to HIGH LINE PRESSURE
above.
2. Front servo accumulator:
a. Front accumulator spring missing, broken.
b. Accumulator piston stuck.
3. Direct clutch
-
air check for leak to outer area of
clutch piston or center piston seal.
4. Damaged center support.
NO ENGINE BRAKING IN SUPER RANGE
-
2ND GEAR
1. Front servo accumulator:
a. Servo or accumulator oil rings or bores leaking.
b. Servo piston cocked or stuck.
2. Front band broken, burnt (check for cause), not en-
gaged on anchor pin and/or servo pin.
NO ENGINE BRAKING IN LO RANGE
-
1ST GEAR
Case assembly
-
lo-reverse check ball mispositioned
or missing from case; case damaged at lo-reverse
check ball area.
Rear servo:
a. Oil seal ring, bore or piston damaged; leaking
apply pressure.
b. Rear band apply pin short, improperly assem-
bled.
Rear band broken, burnt (check for cause), not en-
gaged on anchor pins or servo pin.
NOTE:
Items I, 2 and 3 will also cause slips in
Reverse or no Reverse.
NO PART THROTTLE DOWNSHIFT
-
(INSTALL PRESSURE GAUGE)
1. Oil Dressure
-
refer to HIGH OR LOW OIL PRES-
2. Control valve
-
3-2 valve stuck spring missing or
broken.
NO DETENT DOWNSHIFTS
1. Detent switch adjustments, connection (switch
plunger activated approx. 7/8" at full throttle open-
ing).
2. Solenoid inoperative, connections.
3. Control valve-detent valve train sticking.
LOW OR HIGH SHIFT POINTS
-
(INSTALL
PRESSURE GAUGE)
1. Oil Pressure
-
refer to HIGH OR LOW OIL PRES-
SURE above.
2. Governor:
a. Valve sticking.
b. Feed holes restricted or leaking; pipes damaged or
mispositioned.
c. Feed line screen plugged
2. Detent switch.
3. Detent solenoid stuck open, loose, etc. (will
cause late shifts).
4. Control valve:
a. Detent valve train.
b. 3-2 valve train (detent upshifts possible).
c. 1-2 shift valve train
-
1-2 regulator valve stuck
(this would cause a constant 1-2 shift point, re-
gardless of throttle opening).
d. Spacer plate gaskets mispositioned; spacer plate
orifice holes missing or blocked.
5. Case porosity; intermediate clutch cup plug leaking,
missing.
WON'T HOLD IN PARK
1. Manual linkage maladjusted.
2. Internal linkage:
a. Parking brake lever and actuator defective
SURE above. (checkfor chamfer on actuator rod sleeve).