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Technical Service Information
AISIN SEIKI 450-43LE
NO REVERSE
COMPLAINT: After overhaul, the transmission seems to operate reasonably well when the truck is cold,
although shift quality is not the best. Once the truck has been driven one to two miles, shift quality
deteriorates further and reverse is slipping badly. Reverse movement is non-existant on any
degree of incline.
CAUSE: The pressure control solenoid has been installed 180 degrees out as shown in Figures 1 and 2.
CORRECTION: Install the Pressure Control Solenoid with the solenoid feed ports facing the corresponding
passages in the valve body as seen in Figures 3 and 4.
A special thanks to Rob Profeta of Sunrise Transmission in Islip Terrace, N.Y. for sharing his experience with us
and for providing the photos that made this bulletin possible.
08-28
Page 1 of 3
AUTOMATIC TRANSMISSION SERVICE GROUP
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Technical Service Information
PRESSURE CONTROL
SOLENOID INSTALLED
180 DEGREES OUT
INCORRECT
Copyright © 2007 ATSG
Figure 1
INCORRECT
PRESSURE CONTROL
SOLENOID INSTALLED
180 DEGREES OUT
Figure 2
08-28
Page 2 of 3
AUTOMATIC TRANSMISSION SERVICE GROUP
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Technical Service Information
PRESSURE CONTROL
SOLENOID INSTALLED
WITH PORTS FACING
VALVE BODY PASSAGES
CORRECT
Copyright © 2007 ATSG
Figure 3
CORRECT
PRESSURE CONTROL
SOLENOID INSTALLED
WITH PORTS FACING
VALVE BODY PASSAGES
08-28
Page 3 of 3
AUTOMATIC TRANSMISSION SERVICE GROUP
