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7A4-14
1 9 7 7 PONTIAC SERVICE MANUAL
CAUTION: BEFORE CHECKING TRANSMISSION FOR WHAT IS BELIEVED T O BE "TRANS. NOISE,"
M A K E CERTAIN THE NOISE IS N O T FROM T H E WATER PUMP, ALTERNATOR, A I R CONDITIONER,
POWER STEERING, ETC. THESE COMPONENTS C A N BE ISOLATED B Y REMOVING THE PROPER BELT
A N D RUNNING T H E ENGINE N O T MORE T H A N TWO MINUTES A T ONE TIME.
TRANSMISSION NOISY
0
PARK, N E U T R A L & A L L DRIVING RANGES
1
PUMP CAVITATION-
O I L LEVEL LOW.
PLUGGED OR RESTRICTED FILTER."
WRONG FILTER.
I N T A K E PlPE
" 0
RING DAMAGED.
I N T A K E PlPE SPLIT, POROSITY I N CASE I N T A K E
PlPE BORE.
WATER I N OIL.
-
POROSITY OR VOIDS A T TRANS. CASE
(PUMP FACE) I N T A K E PORT.
PUMP T O CASE GASKET OFF LOCATION.
I
PUMP ASSEMBLY-
GEARS DAMAGED.
D R I V I N G GEAR ASSEMBLED BACKWARDS.
CRESCENT INTERFERENCE.
BUZZING NOISE-ORIFICE CUP PLUG I N
PRESSURE REGULATOR D A M A G E D OR MISSING.
SEAL RINGS D A M A G E D OR WORN.
-
I
CONVERTER-
LOOSE BOLTS (CONVERTER T O FLYWHEEL).
CONVERTER DAMAGE.
DURING ACCELERATION-
GROUNDED T O UNDERBODY.
I
SQUEAL A T LOW VEHICLE
SPEEDS. ESPECIALLY HOT
I
SPEEDOMETER D R I V E N GEAR SHAFT SEAL-
SEAL REQUIRES LUBRICATION OR
I F SPEEDOMETER D R I V E N GEAR SHAFT APPEARS
TWISTED,
CHECK FOR PRESENCE OF ENGINE
C O O L A N T
I N
T R A N S M I S S I O N .
CHECK
TRANSMISSION COOLER FOR LEAKS.
FIRST, SECOND AND/OR
I
REVERSE
I
PLANETARY GEAR SET-
1.THOROUGHLY CLEAN, D R Y & INSPECT CLOSELY THE THREE (3) SETS OF ROLLER
THRUST BEARINGS
ANDTRUST
RACES FOR A PITTING OR ROUGH CONDITION (SEE
FIG. 7 ) .
2. INSPECT GEARS FOR DAMAGE, WEAR, PITTING A N D PINIONS FOR TILT.
3. INSPECT FRONT I N T E R N A L GEAR RING FOR DAMAGE.
THERE IS N O APPROVED WAY OF CHECKING OR CLEANING THE FILTER. I F THE
FILTER IS SUSPECTED OF BEING PLUGGED OR RESTRICTED, I T MUST BE REPLACED.
3828
Diagnosis Chart F
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