Cadillac 60 Series 1963 Shop Manual page 97

6-4
HYDRA-MATIC TRANSMISSION
Drive 3 position prevents the transmission from
shifting above 3rd speed and applies the overrun
clutch, which allows engine braking in 3rd speed.
Low position prevents the transmission from
shifting above 2nd speed and applies the overrun
band and overrun clutch, which allow engine brak-
ing in 2nd and 1st speeds.
Reverse position releases the neutral clutch and
applies the reverse clutch which places the trans-
mission in reverse.
SERVICE INFORMATION
1. Hydra-Mafic Diagnosis
The following guide has been developed to
assist in diagnosing Hydra-Matic transmission
conditions. This procedure may be used only on
controlled coupling type Hydra-Matic trans-
missions. It does not apply to other trans-
missions.
The instructions must be followed in the exact
sequence as outlined below. Any deviation from
this procedure will result in incorrect diagnosis.
a. Preliminary Instructions
1. Make sure engine and transmission are at
normal operating temperatures.
2. Make sure selector lever moves freely in
all positions and pointer is correctly aligned.
3. Check the following, and correct if neces-
sary:
a. Oil Level
b. Manual Linkage Adjustment
c. TV Linkage Adjustment
4. When a shift is missing, do not attempt an
upshift by overspeeding the engine.
5. Do not alter shift pattern by changing se-
lector lever position while car is in motion.
6. If operation condition is not found in table,
use digit for "normal".
7. Connect a portable tachometer to engine
whenever possible. Engine RPM will identify shift
points. Dropping of needle to approximately 2/3
of its previous reading will verify that a shift has
taken place.
b. Neutral Table Fig. 6-4
1. Move selector lever to Neutral position.
2. Accelerate engine normally.
3. Select digit in Neutral Table that describes
transmission's action. This is the first digit of
the Condition Number.
4. Stop car if it moved.
Shift
1-2
2-3
3-4
4-3
3-2
2-1
Drive 4 Range
Minimum
Throttle
850 RPM
1380
1270
630
540
470
Full
Throttle
2810 RPM
3850
4170
2485
1590
1000
Drive 3
Minimum
Throttle
850 RPM
1380
4170
2485
540
470
Range
Full
Throttle
2810 RPM
3850
4170
2485
1590
1000
Lo Range
Minimum
Throttle
850 RPM
4590
4170
2485
2560
470
Full
Throttle
2810 RPM
4590
417.0
2485
2560
1000
NOTE: These shift points are based on nominal engine speed. Variances from these figures can be
considered normal, if shift pattern is consistent.
Fig. 6-3 Transmission Shift Point Chart