GM Service Manual Online
For 1990-2009 cars only

Gear Range

1-2/3-4 Shift Solenoid

2-3 Shift Solenoid

4-5 Shift Solenoid

Gear Ratio

Park, Reverse, Neutral

OFF

ON

OFF

3.16:1

First

OFF

ON

OFF

3.45:1

Second

ON

ON

OFF

2.21:1

Third

ON

OFF

OFF

1.59:1

Fourth

OFF

OFF

ON

1.00:1

Fifth

OFF

OFF

OFF

0.76:1

All shift solenoids are normally-closed.

The 4-5 shift solenoid also enables engine braking.