The Magic of Torque Converters

Your automatic car is driving on pure liquid magic. Seriously, the engine and the

wheels aren't even physically connected when you stop. It is called a torque converter.

Imagine two fans facing each other; the engine spins one, shooting oil at

the other to move your car. That is why you do not stall at red lights.

Inside, it is a sci-fi movie with planetary gears orbiting a sun gear to shift speeds

automatically. But here is the catch. That red transmission fluid is the only

thing saving you from a massive repair bill. If it turns brown, you are walking

home.