Question

what is manual speed

Answer 1

There is the engine which generates power. And there are the driving wheels which can move the car. To transmit this power from the engine to the driving wheels you need something

Answer 2

With the notable exception of a continuously variable transmission (CVT), a transmission — also called a gearbox — is an oil-filled metal case that contains a number of gears, shafts, bearings, and other parts. Each gear has a specific ratio to ensure the wheels don't spin at the same speedas the engine.

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