GM Service Manual Online
For 1990-2009 cars only

The 3T40 transmission consists primarily of the following components:

    • A four-element hydraulic torque converter
    • A compound planetary gear set
    • A dual sprocket and drive link assembly
    • Three multiple disc clutches
    • One roller clutch
    • An intermediate band assembly
    • A valve body assembly
    • A vane type oil pump

The electronic components of this unit are as follows:

    • A third clutch pressure switch
    • Torque converter clutch solenoid
    • Park/neutral position switch
    • Vehicle speed sensor assembly

For more information refer to Electronic Component Description .