1975 Datsun 280z FSM - Spooled up Racing

Automatic Transmission
"D " RANGE (2ND GEAR)
In this case, the rear clutch is
applied and the band brake holds the
front clutch drum, the connecting
shell and the sun gear from rotating.
The power flow takes place through
the input shaft into the rear clutch and
the front internal gear. With the sun
gear held stationary, the front planetary
gears rotate around the sun gear,
carrying the front planet carrier with
them. The front planet carrier, being
splined to the output shaft, causes
clockwise rotation of the output shaft
at a reduced speed compared with the
speed of the input shaft, with an
increase in torque. As the low and
reverse brake is not applied, the clockwise
rotation of the output shaft
causes clockwise rotation of rear internal
gear and the rear planet carrier also
rotates around the sun gear in a
clockwise direction. The one-way
clutch will act to allow the clockwise
rotation of connecting drum.
AT078
Fig. AT-33 Power transmission during "Dz " range
AT079
Fig. AT-34
Operation of each mechanism during "Dz "range
Kange
Gear
ratio
Clutch
Front
Rear
Low&
reverse
brake
Band servo
Operation
Release
One
way
clutch
Parking
pawl
Park
on
on
Reverse
2.182
on
on
on
When the car speed increases while
running at "D," range (1st gear), the
"1st-2nd" shift valve (3) moves allowing
the line pressure (1) to be introduced
into the line pressure (8)
through itself. The line pressure (8) is
further led to the line pressure (9)
through the second lock valve (9), and
by locking the band servo, obtains the
"2nd" gear condition.
Neutral
Dl Low
Drive D2 Second
D3 Top
2 Second
12 Second
1
1J Low
2.458
1.458
1.000
1.458
1.458
2.458
on
on
on
on
on
on
on
on
on
(on)
on
on
on
on
AT-22