New GM/ACDELCO transmission valve body solenoid.  For 4L60E transmissions. This is only for transmission stamped PWM on the front pump.  The valve body contains several solenoids, there are more than 1 of this particular PN in your tranmsission, so it will have different functions depending which port on the valve body you are replacing.  This is the 3-2 shift (downshift).  This has a white connector.  It is very important that you are matching the solenoid style and connector color to the one you are replacing, as there are around 3 different style solenoids in the valve body.  Solenoid is sold individually.  Fits the following:

96-02 Camaro (all models w/ 4L60E)
96-02 Firebird/Trans Am (all models w/ 4L60E)

This will fit most 1996-2014 4L60E transmission applications as well.