Allis-Chalmers briefly adapted the Allis-Chalmers Model WC as the RC from 1938 to 1941, but it proved expensive, so the B was adapted with wider wheel spacing options, a larger engine, and additional fuel options.

The Model C used the RC's 125-cubic-inch (2,050 cc) Allis-Chalmers 4-cylinder engine, with gasoline and distillate fuel options.

The C inherited the B's three-speed transmission, power take-off and hydraulics.

[1][2][3][4] 84,020 Model Cs were built at the Allis-Chalmers plant in West Allis, Wisconsin.

It was provided with a new four-speed transmission, and power assist rear wheel adjustment was introduced.