Diagnosis Chart D - Pontiac TRANS AM 1977 Service Manual

7A4-12 1977 PONTIAC SERVICE MANUAL
MISSES SECOND ESPECIALLY WHEN TRANSMISSION
IS AT OPERATING TEMPERATURE
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MISSES SECOND GEAR. SLIPS I N SECOND.
TRANSMISSION HUNTS 1-3-1.
GOES TO NEUTRAL ON DOWNSHIFT.
SHIFTS 1-3. NO SECOND EXCEPT "SUPER."
ENGINE FLARE ON DOWNSHIFT.
.
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NO DRIVE OR SLIPS I N DRIVE
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CHECK OUTSIDE MANUAL LINKAGE & CORRECT
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CHECK LINE PRESSURE I N DRIVE-
NORMAL
Q
FORWARD CLUTCH FEED
PASSAGE NOT DRILLED
FORWARD CLUTCH BURNED-
(SEE "CAUSES O F BURNED
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CHECK LO ROLLER CLUTCH OR L O SPRAG
CLUTCH FOR DAMAGE OR LO SPRAG
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CHECK OUTSIDE MANUAL LINKAGE & CORRECT
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BRAKES APPLIED, ENGINE
AT 1000
RPM
NORMAL
*
CONTROL VALVE ASSEMBLY FORWARD CLUTCH
1.2-3 VALVE TRAIN STUCK OPEN (THIS
WILL ALSO CAUSE A 1-3 UPSHIFT I N
DRIVE RANGE).
2. REVERSE FEED PASSAGE-CROSS
CHANNEL LEAK, POROSITY I N CASE OR
V A L V E BODY PASSAGE. GASKETS (SEE "CAUSES OF BURNED
CLUTCH PLATES")
LEAKING.
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REAR SERVO & ACCUMULATOR
1. SERVO PISTON SEAL RING DAMAGED
OR MISSING.
2. SHORT BAND APPLY PIN (THIS MAY
ALSO CAUSE NO OVERRUN BRAKING
OR SLIPS I N OVERRUN BRAKING-LO
RANGE).
3. DAMAGED REAR SERVO PISTON OR
BORE.
REAR BAND
BROKEN, BURNED, LOOSE LINING, APPLY
OIL SEAL RINGS OR GROOVES
DAMAGED OR WORN
Diagnosis Chart D