Park, Neutral And All Driving Ranges; First, Second And/Or Reverse Gear; During Acceleration-Any Gear; Squeal At Low Vehicle Speed - Pontiac TRANS AM 1977 Service Manual

TURBO HYDRA-MATIC 2 5 0 TRANSMISSION 7A2-9
Park, Neutral and All Driving Ranges
Pump Cavitation:
a. Low fluid level.
b. Plugged or restricted strainer.
c. Strainer-to-valve body gasket damaged.
d. Porosity in valve body intake area.
e. Water in fluid.
f. Porosity or voids at transmission case (pump face)
intake port.
g. Pump-to-case gasket off location.
Pump Assembly:
a. Gears damaged.
b. Driving gear assembled backwards.
c. Crescent interference.
d. Oil seal rings damaged or worn.
Converter:
a. Loose flexplate-to-converter bolts.
b. Converter damage.
c. Water in fluid (causes whine).
First, Second and/or Reverse Gear
Planetary Gear Set:
Gears or thrust bearings damaged.
Input or output ring gear damaged.
During Acceleration
-
Any Gear
Transmission grounded to underbody.
Motor mounts loose or broken.
Squeal at Low Vehicle Speed
Speedometer driven gear shaft seal
-
requires lubrication
or replacement.