GM Service Manual Online
For 1990-2009 cars only

The major components of this unit are as follows:

    • A torque converter with an electronically controlled capacity clutch (ECCC)
        This transmission is equipped with an electronically controlled capacity clutch (ECCC). The pressure plate does not fully lock to the torque converter cover. Instead, the pressure plate maintains a small amount of slippage, about 20 RPM, in SECOND, THIRD and FOURTH gears, depending on the vehicle application. ECCC was developed to reduce the possibility of noise, vibration or chuggle caused by TCC apply. Typical apply speeds are 49-52 km/h (30-32 mph) in THIRD gear and 65-73 km/h (40-45 mph) in FOURTH gear. Full lockup is available at highway speeds on some applications.
    • A sprocket drive link assembly
    • Electronic shift solenoid valves to control shift points
    • Forward, Manual 2/1, and Reverse band assemblies that do not require selective band apply pins
    • Input, 2nd, 3rd, and 4th clutches--multiple disc assemblies
    • A compound planetary gear set
    • Three one-way clutches: an input sprag, 3rd sprag, and a 2/1 roller clutch
    • A differential and a final drive assembly with a bolt on the case extension for on-car servicing.
    • A variable vane type oil pump with line pressures controlled by a pressure regulator valve, a reverse boost valve, and a vacuum modulator.