The long-running followers of model B and CA in the Allis-Chalmers D series were the smallest models in the lineup, the D10 and D12. The only difference between these models was the wider front axle on the D12. Parallel front wheels or a three-wheel version were completely abandoned, and the front axles were European-style with adjustable track width. The engine was a new 2.3-liter gasoline engine, which was a downsized version of the one introduced earlier in the D14. The transmission was similar to the CA, with 4 forward gears and 1 reverse, and the clutch was 9 inches in diameter. The hydraulic pressure was only 103 bar.

In 1961, the engine was increased to 2.4 liters. At the same time, a power take-off system was introduced. In the 1964 Series III models, an optional range extender, i.e., an 8+2 transmission, became available. A diesel version of these models was never produced, which limited their success, especially in the later years.

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