Yes the tractor was originaly sold with different pistons than a regular 400 tractor. The pistons gave a higher compression ratio to compensate for power loss in the thinner air. IH refered to the ones marked by a D on a 400 as 5000 ft. They were sold below and above that elevation though. Most tractors received several overhauls by now, so its hard to say what pistons and sleeves are in it now. Most 400 found now have 4.125 C281 pistons and sleeves installed. Tractor and engine you have were put togeather at the factory in December of 1954. Tractor probably has the same type rear wheels unless changed as the SM.
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Today's Featured Article - History of the Cockshutt Tractor - by Danny Bowes (Dsl). The son of a very successful Toronto and Brantford, Ontario merchant, and himself quite an entreprenuer, James G. Cockshutt opened a business called the Brantford Plow Works in 1877. In 1882, the business was incorporated to become the Cockshutt Plow Company. Along with quality built equipment, expedious demand and expansion made Cockshutt Plow Works the leader in the tillage tools sector of the farm equipment industry by the 1920's.
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