Chrysler laser 1990 Technical Information Manual page 299

Upshift from 3rd to 4th
control valve is directed to the rear clutch exhaust
the right, closing the No.5c port. This cuts off the
pressure to the rear clutch and also releases the
pressure acting on the rear clutch through N
port, No.20a port and No. 20 port.
On the other hand, the rear clutch exhaust valve
which is pushed to the right opens the NO. 19 POn
and directs the 4th pressure (line pressure) to the
right end of the 2-3/4-3 shift valve. The 3rd
pressure (or the No.7 line pressure) is acting on the
shes the valve toward the left. closing the No. 11
me pressure port. This btocks the pressure to the
front clutch and the release side chamber of
leased through the No. 12. and then the No.9~ Pofi.
A U T O M A T I C T R A N S A X L E
Rear clutch
Front clutch -
Rear clutch
Front clutch
control valve
Gear
. 15
O
servo
release side
p r e s s u r e
Downshift from 4th to 3rd Gear
When the 4th pressure is released by the move-
ment of the shift control valve, the rear clutch
exhaust valve moves to the left, creating a 3rd gear
state, and the pressure is directed to the rear clutch.
At the same time as this happens, the 4th pressure
in No. 19 line which has been acting on the 2-3/4-3
shift valve is released. This causes the 3rd pressure
established in the No.7 line to push the 2-3/4-3
shift valve to the right, and creates a 3rd gear state
where the line pressure from the l-2 shift valve is
directed to the front clutch and the release side
chamber of kickdown servo cylinder through the
No. 12 line.
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