GM Service Manual Online
For 1990-2009 cars only

Transmission performance may be influenced by one, or more of the following items:

    • Fluid level high/low.
    • Engine performance.
    • Manual linkage adjustment.
    • Internal fluid leaks.
    • Electrical system.
    • Transmission or other mechanical component.
    • Vacuum Modulator System

These items should be checked and corrected, if necessary, before attempting transmission diagnosis.