GM Service Manual Online
For 1990-2009 cars only

Shift Solenoid Valve State and Gear Ratio

Gear Range

1-2/3-4 Solenoid Normally Closed

2-3 Shift Solenoid Normally Open

Gear Ratio

Reverse

OFF

ON

2.00:1

First

OFF

ON

2.86:1

Second

ON*

ON

1.62:1

Third

ON*

OFF*

1.00:1

Fourth

OFF

OFF*

0.73:1

* Denotes the solenoid is open with fluid pressure flowing through the shift solenoid and acting on the shift valve.