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I was wondering if a question like this one would be appropriate for this stackexchange or if it belongs to another one (or none at all at the moment, from my browsing, this one is the most appropriate, but it's still not completely on subject :/).

I'd like to know what would happen if a car was placed facing downhill a long straight road, with the automatic transmission engaged in first gear, with the brakes getting released (the car would start to go forward, accelerating, that I know). Mainly: would the RPMs needle come up, if so, at which rate? Would the torque converter lockup, if so, when and what would be the effect on the whole car (would it suddenly slow down)? Would it upshift at some point?

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I'd say that you found the right group of people to ask. However, it doesn't fit with the standard template of mechanics questions:

Specific issues with motor vehicle maintenance or repair

Real problems or questions that you’ve encountered

However, it's a great question to bring up in the chat. We'd be happy to jabber all day about hypotheticals like that. Perhaps a few passes through the people in the chat would turn it into a great quesstion for the site....

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