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7A3-2
1977 PONTIAC SERVICE MANUAL
CONVERTER ASSEMBLY
SUN GEAR 6 DRIVE SHELL
CONVERTER PUMP
FORWARD CLUTCH
INPUT R I N G GEAR
INTERMEDIATE
L O W 6 REVERSE
ROLLER CLUTCH
0
DRIVE GEAR
OUTPUT SHAFT
GOVERNOR
-
DRIVEN GE
VALVE BODY
INPUT SHAFT
INTERMEDIATE O.R.
ROLLER CLUTCH
L O W 6 REVERSE CLUTCH
OIL PUMP COVER
L O W 6 REVERSE CLUTCH SUPPORT
\
L o l l PUMP BODY
LSTATOR
SHAFT
287 5
Fig.
7A3-1
THM
3 5 0
Transmission
-
Cross Section
DIAGNOSIS
SEQUENCE FOR TURBO HYDRA-MATIC
3 5 0 TRANSMISSION DIAGNOSIS
1. Check and correct oil level.
2. Check detent cable adjustment.
3. Check and correct vacuum line and fittings.
4. Check and correct manual linkage.
5. Road test car.
a. Install oil pressure gage.
b. Road test using all selective ranges, noting when
discrepancies in operation or oil pressure occur. See Fig. 7A3-
2.
c. Attempt' to isolate the unit or circuit involved in the
malfunction.
d. If engine performances indicate an engine tune-up is
required, this should be performed before road testing is
completed or transmission correction attempted. Poor engine
performance can result in rough shifting or other
malfunctions.
Fig.
7A3-2
Taps for Oil Pressure Checks
TURBO HYDRA-MATIC 3 5 0
TRANSMISSION OIL CHECKING
PROCEDURES
Before diagnosis of any transmission complaint is
attempted, there must be understanding of oil checking
procedure and what appearance the oil should have. Many
times a transmission malfunction can be traced to low oil level
or improper reading of dipstick. Due to the transmission fluid
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