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Just to clarify, you looked up the part and the spreadsheet called for a 1" -18? Only reason I ask is another drain valve website says otherwise for a MT654...
http://ezoildrainvalve.com/transmission-plugs.html
Anyone know what the thread size/pitch is for the Allison transmission drain plug? When I drain it the next time I want to install a Fumoto valve in there to make future services easier. I can measure this time but would rather get one on hand and have it to install. Thanks!