The Cockshutt 40 was scaled up from the 30, with many of the same features, including a live power takeoff (PTO), which at that time was a novelty.

[1][2][3][4] Following the acquisition of Buda by competitor Allis Chalmers in 1953, Cockshutt used Perkins and Hercules engines.

[6] Painted all-orange, the CO-OP E4 was a Cockshutt 40 rebranded for sale in the United States.

[8] The Cockshutt 50 was developed using Model 40 transmission components and running gear, but was substantially heavier and more powerful.

The new tractor used the basic Model 40 frame, with a four-cylinder 198-cubic-inch (3,240 cc) Hercules GO198 gasoline engine, with a 6-speed transmission.

Another promotional version, the Golden Arrow, was produced in 1957 with an enhanced three-point hitch with draft and depth control.