In a few of the newest cars on the market, you can shift gears by simply pressing a button, turning a knob or toggling a small joystick. Yet simultaneously, plenty of different automobiles still require motorists to make use of one foot for the clutch pedal and another for the gas, all while using one hand to control the gear-shift lever through a distinct pattern of positions. 
And many other current vehicles don’t have any traditional gears at all within their transmissions.
But regardless of whether a vehicle has a fancy automatic, an old-school Variable Speed Drive Motor manual or a modern-day continually variable tranny (CVT), each unit has to do the same job: help transmit the engine’s result to the generating wheels. It’s a complex task that we’ll make an effort to make a bit simpler today, you start with the fundamentals about why a transmitting is needed to begin with.
Let’s actually start with the normal internal combustion engine. As the fuel-air mix ignites in the cylinders, the pistons start moving up and down, and that movement can be used to spin the car’s crankshaft. When the driver presses on the gas pedal, there’s more fuel to burn in the cylinders and the complete process moves quicker and faster.
What the transmission does is change the ratio between how fast the engine is spinning and how fast the driving wheels are moving. A lesser gear means optimum performance with the wheels moving slower compared to the engine, while with a higher gear, optimum performance includes the wheels moving quicker.
With a manual transmission, gear shifting is handled by the driver via a gear selector. Many of today’s vehicles have got five or six ahead gears, but you’ll discover older models with anywhere from three to six forward gears offered.
A clutch is used to transmit torque from a car’s engine to its manual tranny. The many gears in a manual transmitting allow the car to visit at different speeds. Larger gears offer lots of torque but lower speeds, while smaller gears deliver much less torque and allow the car travel more quickly.