Mack Omnibus en orden cronológico

1914 – The Hewitt nameplate was discontinued.

The Manhattan Motor Truck Company (which ran the Mack branches in New England) became the Mack Motor Truck Company.

The Mack AB was the company's first standardized, high volume model series, introduced in 1914. The first ABs had chain drive or worm drive. In 1920, a dual reduction drive replaced worm drive as an option. The AB filled the medium-duty role and incorporated many innovations particularly adapted to the times. Its simple, classic styling and overwhelming customer acceptance endured continuous modification and a production run extending through 1936, for a total of over 55,000 units.

Автобус Mack 6CL3S производился с 1932 по 1937 год. Имел 28 пассажиромест, 6-и цилиндровый бензиновый двигатель в 117 л.с. Славился в Нью-Йорке одним из среди популярных автобусов того времени. До наших дней в автомузее Ямайки сохранился единственный его экземпляр. Всего было произведено 441 единица.