Cadillac 60 Series 1963 Shop Manual page 96

HYDRA-MATIC TRANSMISSION
6-3
reduction of the rear unit provides 3.96 to 1
reduction at the output shaft.
2nd speed is obtained by placing the front unit in
direct drive and the rear unit in reduction. This
provides 2.55 to 1 reduction for second speed.
3rd speed is obtained by placing the front unit
in reduction and the rear unit in direct drive
providing 1.55 to 1 reduction.
4th speed is obtained by placing both units in
direct drive, causing the output shaft to rotate at
approximately engine speed.
Reverse is obtained by placing the front unit in
reduction, the rear unit in neutral, and the re-
verse unit in reduction. The combination of the
1.55 to 1 front unit reduction and the 2.42 to 1
reverse unit reduction provides a 3.74 to 1 r e -
duction in the reverse direction.
Selector Positions (Fig. 6-2)
There are six selector positions which enable
the driver to control the operation of the trans-
mission under various conditions.
Parking position places transmission in neutral
and engages parking pawl with teeth in re-
verse planet carrier, preventing output shaft from
turning.
Neutral position releases the neutral clutch,
allowing the rear unit to free-wheel so that no
power is transmitted to the output shaft.
Drive 4 position applies the neutral clutch, to
place the transmission in normal operating range.
All four forward speeds will then occur in normal
sequence.
Selector
Position
PARK
NEUTRAL
DR 4
DR 3
LO
REVERSE
Speed
1
2
3
4
1
2
3
1
2
FRONT UNIT
Front Unit
Coupling
Front Sprag
Clutch
Overrun
Clutch
REDUCTION
Empty On Off
REDUCTION
Empty On
Off
REDUCTION
Empty On Off
DIRECT DRIVE
Full Off Off
REDUCTION
Empty On Off
DIRECT DRIVE
Full
Off Off
REDUCTION
Empty On On
DIRECT DRIVE
Full Off
Off
REDUCTION
Empty On On
REDUCTION
Empty On On
DIRECT DRIVE
Full
Off Off
REDUCTION
Empty On Off
REAR UNIT
Neutral
Clutch
Rear Sprag
Clutch
Rear
Clutch
Overrun
Band
NEUTRAL
Off On
Off Off
NEUTRAL
Off
On
Off Off
REDUCTION
On On Off Off
REDUCTION
On On Off Off
DIRECT DRIVE
On
Off
On
Off
DIRECT DRIVE
On
Off On Off
REDUCTION
On
On Off Off
REDUCTION
On On
Off Off
DIRECT DRIVE
On
Off On Off
REDUCTION
On On
Off
On
REDUCTION
On On Off
On
NEUTRAL
Off On Off
Off
REVERSE UNIT
Reverse cone
Clutch
Parking
Pawl
IDLING
Off On
IDLING
Off Off
IDLING
Off Off
IDLING
Off Off
IDLING
Off Off
IDLING
Off Off
IDLING
Off
Off
IDLING
Off
Off
IDLING
Off Off
IDLING
Off Off
IDLING
Off Off
REDUCTION
On Off
Fig. 6-2 Power Flow Summarized