Abstract: A modular window regulator system is provided for controlling the movement of a window which includes first and second cross arms pivotally joined to one another, each cross arm having first and second ends, the first cross arm first end being geared; a back plate mounting a driver gear for torsional engagement with the geared end of the first cross arm, the back plate mounting the first end of the second cross arm for linear movement; first and second channels extending generally vertically and transverse to the back plate and fixably joined thereto at opposite ends of the back plate; a sash slidably mounting the second end of the cross arms, the sash having first and second ends extending toward the first and second channels, respectively; a first guide block fixably connected to the sash first end and to the window, the first guide block having a vertical bearing connection with the first channel; a second guide block fixably connected to the sash second end and to the window, the second guide block having