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Farmalls were not produced by model year. Production serial numbers only indicate when a tractor came off the line. Changes were made as approved and implemented by the factory. Unless the change was very important old style parts were used up before the new style part was actually installed on a tractor. Like David_ID said, check the casting numbers to see what month the parts were cast. It is very possible someone mixed two tractors. It is also very possible your tractor was in the transition period and had some of the "1939" parts installed. Guy Fay might be able to help you with exactly when the transmission cover plate was changed. Although it is referred to as 1939, I'd be real surprised if they made the change after shift on 12/31/39. Lots of original tractors have casting codes from different months, just the way the castings worked their way through the system and onto the assembly line. In my opinion way too much emphasis is put on the year of manufacture because IH did not produce by year or model year.
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