I have a 2013 leaf with what sounds like a bearing noise in the reduction gear. I am looking at replacing the transaxle with a used one from a salvaged Leaf. The reduction gears for the 2011-2012 MY have a different slightly taller gear ratio than the 2013+ MY reduction gear. Can I replace the reduction gear (the whole unit) in my 2013 with one from a 2011-2012? The reason I am considering this is since I have to replace it anyway might as well go with the slightly taller ratio for slightly better efficiency (I don't care about torque). Is the only difference between the 2011-2012 and the 2013+ the gear ratio? Is everything else plug and play (same housings / bolt patterns etc.)? They look identical in pictures online, but of course maybe they are not. I called a salvage parts dealer and they say the "fitment" is different, but they are only looking on their computer that says the are not the same, but I already know that the gear ratio is one difference. If that is the only difference then I'm good to go. Anyone know if it will work?