A sortation conveyor has an endless apron supported for longitudinal movement on an elongate frame. An induction conveyor deposits articles on an offset lateral portion of a top conveying run of the apron. A pin guide assembly is coupled between the elongate frames and is upwardly presented to selectively receive the pin of pushers that laterally move across the apron. An upstream pre-sort section thereof positions articles from the offset lateral portion to an opposite lateral portion of the top conveying run. A downstream divert section of the pin guide assembly selectively diverts the articles to a divert target on the corresponding lateral side to the selected one of offset lateral position and the opposite lateral position.