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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