Without seeing the tractor the first thing I will ask. At the tractor center housing mating point to the transmission can you see four 5/8 diameter attaching bolts with 7/8 or 15/16 wrench head size on each side? If so its not a regular SM chassis. Top of center housing would also have a steel plate instead of being part of the casting like a regular SM.
Sounds like it may be a SMTA chassis but the 3 number serial number don't match that. If someone put a earlier 400 center housing with a 3 number serial and other parts the date codes should be later than you stated. Early 400 may have one or two early 54 dates but most are 7 through the 12 month.
Check for a date code on center housing left side to rear of clutch shaft that goes in the side of housing, if its what I suspect. Also on the right side just to rear of biggest part of housing see if there's 6 numbers followed by R1? or R2?
Also forgot to ask. How far is the rear of fuel tank from the front side of steering post?
This post was edited by D Slater at 17:55:03 02/02/15.
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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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