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An extremely thin track width means that the actual turns difference in normal operation wil be limited any way, so a diff probably isn't totally necessary.
If you really wanted one, get a rear fixed gear or multi speed trans axle from a riding mower. I've got about 15 multi speed ones... Want one?
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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