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TURBO HYDRA-MATIC 3 5 0 TRANSMISSION
7A3-9
No engine braking
-
L2
-
2nd gear
1. Intermediate servo
and 2-3 accumulator
2. Intermediate over-
run band.
3. Oil pressure low.
la. Servo or accumulator oil
rings or bores leaking.
b. Servo piston stuck.
2. Intermediate overrun band
broken, burned (check for
cause).
3. Pressure regulator and/or
boost valve stuck.
No engine
L1
-
1st gear
1. Manual low control
1. Stuck
valve assembly.
2. Oil pressure low.
2. Pressure regulator and/or
boost valve stuck.
3. Low and reverse
3. Piston inner seal damaged
clutch.
or missing.
No part throttle
1. Oil pressure.
1. Vacuum modulator assembly,
downshift (install
modulator valve, pressure
pressure gage)
regulator valve train (other
malfunctions may also be
noticed).
2. Detent valve and
2. Sticks or disconnected
linkage.
or broken.
3. 2-3 shift valve.
3. Stuck.
No detent downshifts
-
-
- -
1. Control valve assy
2. Detent valve and
linkage.
-
-
-
1. 2-3 valve stuck.
2. Sticks or disconnected
or broken.
Low or high shift
points (install
pressure gage)
1. Oil pressure.
2. Governor
3. Detent valve and
linkage.
4. Control valve assy.
5. Case
- -
Won't hold in
1. Manual linkage.
Park
2. Internal linkage.
la. Engine vacuum
-
check
at transmission end of the
modulator pipe.
b. Vacuum modulator assembly
vacuum line connections at
engine and transmission,
modulator valve, pressure
regulator valve train.
2a. Valve sticking.
b. Feed holes restricted or
leaking, pipes damaged or
mispositioned.
c. Feed line plugged.
3. Stuck open (will cause
late shifts).
4a. 2-3 valve train sticking.
b. 1-2 shift valve train sticking.
5. Porosity.
1. Misadjusted.
2a. Parking brake lever and
actuator assembly. Check for
chamfer on actuator rod sleeve.
b. Parking pawl broken or
inoperative.
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