An automatic transmission seems pretty simple; after all, you just put it in Drive and go. But as with most things automotive, a lot of complexity goes into making it look easy.
The engine contains a heavy central crankshaft cylinder that spins, which provides the power to turn the wheels. “Engine speed” is how fast the crankshaft spins, measured in revolutions per minute or “rpm.” Most engines make the majority of their power within a relatively narrow range of speeds, but driving the vehicle requires a wider range. The transmission is the vital link, increasing torque to accelerate away from a stop, or preventing the engine from working too hard at highway speeds.
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