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POWERGLIDE 20
Failure
Probable Cause
Clutch failure - burned plates.
0
Low band adjusting screw backed off more than
specified.
Improper order of clutch plate assembly.
Extended operation with low oil level.
Clutch drum relief ball stuck.
Abnormally high speed upshift.
a. Improper governor action.
"low."
Car creeps excessively in Drive.
Car creeps in Neutral.
No drive in Reverse.
Improper shift points.
Oil leaks.
Idle speed too high.
Incorrect manual valve lever adjustment.
High clutch or low band not released.
Incorrect manual valve lever adjustment.
Reverse clutch piston stuck.
Reverse clutch plates worn out.
Reverse clutch leaking excessively.
Blocked reverse clutch apply orifice.
Incorrectly adjusted carburetor-to-transmission linkage.
Incorrectly adjusted throttle valve.
Governor defective.
Transmission case and extension.
a. Extension oil seal.
b. Shifter shaft oil seal.
c. Speedometer driven gear fitting.
d. Pressure taps.
e. Oil cooler pipe connections.
f. Vacuum modulator assembly and case. (A very
smoky exhaust indicates a ruptured vacuum
modulator diaphragm).
Transmission oil pan gasket.
Converter cover pan.
a. Oil pump attaching bolts.
b. Oil pump seal ring.
c. Oil pump oil seal.
d. Oil drain in pump plugged.
Oil forced out of filler tube.
a
Oil level too high, aeration and foaming caused by planet
carrier running in oil.
Water in oil.
