L Mack: Farmall 100 serial numbers are on left side of clutch housing. The engine serial number is directly below No.1 spark plug however that will not help. Farmalls 100 and 200 each have their own sequence of serial numbers starting at 501. The engine however share a common swquence of serial numbers.
Farmall 100-501 had engine number 572, 200-501 had engine number 663, I-100-501 had engine 976. By the end of production in 1956 Farmall 100-18940 had engine 35930, 200-15698 had engine 34131. The last I-100 was 635, no listing of engine, but as you can see, only 135 built.
Interesting at this point 130 and 230 each start over at 501 and engine numbers continue where 100 and 200 left off. Same occurs when you go to 140 and 240, engine numbers continue where 130 and 230 ended.
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Today's Featured Article - Ford Part Number Trivia - by Forum Participants. "Replaced by" means the part was superseded. All of my part books date back to 1964 and New Holland have changed some part numbers. They usually put the old Ford part number on the package. I was suppressed when I looked up the part number of the auxiliary drive shaft because for some reason the part number went through a radical change and it lost its "Basic Part Number". Ford part numbers follow the following rules. Most part numbers are in three parts. The middle part is called the
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