1932 - Early in 1932, Alfred Fellows Masury, Mack's Chief Engineer, was admitted to the hospital for an operation. Masury was one of those individuals who wasn't used to his hands being idle for any period of time. During his recuperation in the hospital, Masury decided to carve a bulldog. (Some rumors indicate that he carved the first bulldog from a bar of soap; other rumors indicate the first was carved from wood.)

Whether the first bulldog hood ornament was soap or wood, we do know that shortly after his release from the hospital, he did in fact carve a bulldog in wood.

Masury applied for and received a patent for his design; that Bulldog design has adorned nearly every Mack truck ever since/

1933 - A year of growth and building in America, and Mack Trucks, Inc. played a major role, including the building of Boulder Dam!

1936 - The name of the International Motor Company is changed to the Mack Manufacturing Corporation.

The Mack E series, introduced in 1936, were streamlined, medium-duty trucks with gross vehicle weight ratings ranging up to 23,000 lbs. The E models were available in both conventional and cab-over-engine configurations and proved themselves among the most versatile products ever offered by Mack. Over 78,000 were produced through 1951.

Mack was one of the first truck manufacturers to apply four-wheel brakes to heavy-duty trucks, increasing braking ability and safety, particularly with heavier loads. In 1938, Mack became the first truck manufacturer to design and build its own heavy-duty diesel engines, establishing the tradition of "balanced design" that continues today.

1936-1938 - Mack merchandised a series of trucks under the name "Mack Jr." The vehicle was actually built by the Reo Motor Car Company in Lansing, Michigan. The vehicles were built according to Mack specifications and were sold through the Mack sales organization. In total, there were 4,974 chassis built during this time frame.

This was the second time in its history that Mack sold a Mack junior chassis. The 1936-1938 units should not be confused with the earlier Mack Junior; production on that version began in 1909.

During the 1938 to 1944 period, Mack built and sold a model called the "ED," which was essentially a three-quarter ton vehicle. Records indicate that a total of 2,686 ED model trucks were delivered.

1936-1972 - Mack built off-highway or mine trucks from 1926 to 1979, from 15 to 100 ton capacity.

The Mack AP model was Mack's first off-highway vehicle. From 1926 through 1938, 285 of this units were built.

From 1943 through 1964, a total of 1,275 of the LR model truck was built. The next generation, the LV model, was built from 1948 through 1961; 515 of these units were built and sold. The M Series, rated from 15 to 100 tons, was produced from 1960 to 1979.