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7-14
GROUP 7 -AUTOMATI_C TRANSMISSION
TRANSMISSION MODEL
FIG. 2-
Transmission Identification Tag
only selector lever settings at which
the engine will start. To actuate the
starter, insert the ignition key and
turn it fully to the right.
TO ENGAGE THE
TRANSMISSION
The transmission is engaged when
one of the following positions in the
quadrant is selected:
. 1. Drive (Dl Large Dot).Dl posi-
tion should be used for most normal
driving. This driving range features
maximum
performance,
economy
and flexibility by incorporating an
automatic low gear start. The trans-
mission automatically shifts from
low to intermediate then to high
gear. To obtain maximum accelera-
tion from a standstill, press the ac-
celerator to the floor and the car
will move forward under wide open
throttle.
With the accelerator all the way
down to the floor, the transmission
will shift from low to intermediate
gear at approximately
45
mph and
then into high gear at approximately
70 mph.
For fast acceleration while driv-
ing in high gear, press the accelera-
tor to the floor. The transmission
will automatically downshift from
high to intermediate at any speed
between approximately 30 to 70 mph
and into low gear at speeds below
approximately 30 mph. Release the
accelerator and the transmission will
automatically upshift to intermed-
iate or high gear depending upon
car speed and accelerator position.
2. Drive (D2 Small Dot). The D2
position provides intermediate gear
starts with a single shift into high
gear. .This range is desir'able for
smooth gentle starts, as well as driv-
ing under slippery road conditions.
The smooth transition of power to
SERIAL NO.
01324-A
the rear wheels in D2 will minimize
rear wheel spin and provide better
control of the vehicle. The selector
lever can be alternated between D 1
and D2 positions at any road speed.
3. Low (L). The L position is
provided for extra pulling power and
~ngine
b:aking. Extra pulling power
IS
sometimes needed when driving
through deep sand, mud, or snow
and
wh~n.
climbing steep grades.
When dnvmg from a standing start,
the. transmission will not upshift into
a htgher gear while the selector lever
is in the
L
position. Therefore to
avoid imposing unnecessary s;ress
on the engine and prevent overheat-
ing the transmission, the car should
not be driven in low gear for ex-
tended periods of time or at con-
tinuous speeds in excess of
25
mph.
. To o?tain maximum engine brak-
mg, shtft to the L position when
descending steep grades. The trans-
mission will automatically shift to
intermediate gear at speeds above
approximately
25
mph. When the
car speed drops below approximately
25
mph, the transmission will auto-
matically shift to, and remain in,
low gear. Move the selector lever
back to D 1 or D2 position and the
transmission wi11 resume normal au-
tomatic shift operation.
4. Reverse (R). Use the R position
to back up the car. Bring the car to
a complete stop before moving the
selector to R.
5. Park (P). Bring the car to a
complete standstill. Set the selector
in
P.
position and, as an added pre-
cautiOn, set the parking brake.
6. "Rocking" the Car. Move the
selector lever back and forth be-
tween R and L with the accelerator
pedal depressed slightly to increase
engine speed and provide traction.
CAUTION: Do not race the en-
(094)
gine. If "rocking" at medium
throttle will not provide traction,
have the car pulled from its stuck
position to prevent overheating
the transmission.
1. Towing. If the transmission is
in working order, the car may be
towed for short distances (less than
12 miles) at a speed no higher than
40 mph with the selector lever set
at N. If the transmission is inoper-
ative, the drive shaft should be dis-
connected before towing, or the rear
of the car raised by the tow truck.
If the rear of the car is raised a
locking device should be instalied
on the steering wheel to keep the
front wheels in a straight-ahead
position.
TORQUE CONVERTER
OPERATION
The hydraulic torque converter
(Fig. 3)
consists of an impeller
(pump), a turbine, and a stator.
All these parts are enclosed and
operate in a fluid-filled housing .
When the engine is running, the
fluid in the torque converter flows
from the impeller to the turbine and
back to the impeller through the
stator. This flow produces a maxi-
mum torque increase of about 2
to 1 when the turbine is stalled.
When enough torque is developed
by the impeller, the turbine begins to
rotate, turning the turbine shaft.
The converter torque multiplica-
tion gradually tapers off as turbine
speed approaches impeller speed, and
FIG.
3-Cross-Section of
Typical Torque Converter
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