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Beyond that, we don't know how quickly production resumed after the revised built transmissions conversion date of May, 2017 serial number 3416. It could have been the next day, or not for a month or more. Were pre and post built units shipped together, or was there a gap? When did production of 2018 vehicles in the US begin, and were the trannies used in date order of build or arrival? Are Sienna and Highlanders built on the same line in mixed succession, or on a different line, and how were crates of trannies routed between plants?
I believe that Toyota does know exactly what VIN has a potentially 'good' or questionable transmission, but the data might be such a jumble that for simplicity they just tell dealers in the TSB to look for a number on the transmission case. But TAC likely already knows the answer when the dealers calls in looking for authorization and assistance.
2015 Sienna Limited Premium, 2014 Subaru Outback, 2013 Honda CRV.
Sold: 2008 Sienna LE, 2002 Subaru Outback, 2002 Honda Odyssey