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The transmission fluid pump is driven from the input shaft, and will obviously not be pumping if the engine is not running. That leaves 'splashing' or static immersion in fluid as the only source of lubrication. Will that be enough? Unless you're a transmission designer or accomplished mechanic, you have no way of knowing. I'd argue that unless the car has an unlimited speed/range towing rating, coasting with the engine off will be potentially damaging. Asking on a forum like this is not going to provide a correct answer; just because someone else has been coasting without immediately blowing up their transmission does not mean that their car, or yours, won't suffer some level of damage.
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