Not so long ago, it was common for automatic transmissions to be referred to as slushboxes, since that's how they often behaved. Rather than use a mechanical clutch, traditional automatic transmissions use a fluid coupling between the engine and the gear-sets to transmit drive torque. This provides some benefits, but isn't a perfect system.
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When it isn't unusual to get into five or six different cars a month, you realize you spend a lot of time figuring out how, and how many ways, one can shift the gears in an automatic or double-clutch car. Where is the shifter? How many settings does the shifter have? How do I get into manual shift mode? Once there, how does it work? Are there paddle shifters as well? Do the paddle shifters move with the wheel or not? And so on...