An automotive slouch rear seat with improved adjustability is provided including an upper seat back and a lower seat bottom. The upper seat back includes a fixed rear seat back, a pivotal seat back, and a sliding seat back. The pivotal seat back has an upper end and a lower end for connecting to the lower seat bottom. The sliding seat back is slidably engaged to the fixed rear seat back. The sliding seat back is rotatably engaged to the upper end of the pivotal seat back. The lower seat bottom includes a fixed rear seat bottom, and a sliding seat lower. The sliding seat lower is slidably engaged to the fixed rear seat bottom. The sliding seat lower is rotatably engaged to the lower end of the pivotal seat back. Also, an automotive slouch rear seat assembly and a method of assembling a pre-installation automotive slouch rear seat assembly are provided.