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  1. JD Lawn & Garden Tractor Forum
    Here are the 400 series serial number breakdowns. 400 Serial Numbers: 1975 =   30,001 -   55,000 (19.9hp Kohler Engines) 1976 =   55,001 -   70,000 (19.9hp Kohler Engines) 1977 =   70,001 -   80,000 (19.9hp Kohler Engines) 1978 =   80,001 -   95,000 (19.9hp Kohler Engines) 1979 =   95,001...
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