The CO-OP E4 is a row-crop tractor produced from 1949 to 1958 by CO-OP in Brantford, Ontario, Canada. It is essentially the same as the Cockshutt 40. It features a Buda 3.8L 6-cylinder gasoline or diesel engine, a 6-speed gear transmission with 2 reverse speeds, and a rear PTO type of 540. The tractor has a wheelbase of 86.7 inches and an operating weight of 5305 lbs. It was originally priced at $3,600 in 1957.