For 1990-2009 cars

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
1st | OFF | ON | OFF | 3.45:1
2nd | ON | ON | OFF | 2.21:1
3rd | ON | OFF | OFF | 1.59:1
4th | OFF | OFF | ON | 1.00:1
5th | OFF | OFF | OFF | 0.76:1
All shift solenoids are normally-closed. The 4-5 shift solenoid also enables engine braking.