In 1931, Pierce-Arrow had three models on four different wheelbases. They downsized their engine options to two, and eliminated the 115 horsepower unit. The prior year, they had reverted back to numerical designations for their models. This was retained for 1931. The Model 41 was the largest and rested on a wheelbase that measured 147 inches. Next in line was the Model 42, which fell between the 41 and 43. It was an intermediate model built o the 142-inch wheelbase. The entry-level Pierce-Arrow was the Model 43 which came in two sizes, either a 134 or 137-inch platform and was powered by the 365.6 cubic-inch engine.