The 1931 Packard line consisted of 8 cylinder vehicles only. The less expensive model, the Standard Eight, featured a 319 cubic inch engine that was mounted on a 126 or 133 inch wheelbase. The expensive model was the Custom Eight or 840 series which was powered by a 384 cubic inch engine mounted on either a 140 or 145 inch chassis. Approximately 8,000 Custom Eight models were produced that year as opposed to nearly 16,000 Standard Eight models. The model for 1931 featured a four-speed transmission which was used in 1931 only.