In a few of the latest cars on the market, you can change gears by simply pressing a button, turning a knob or toggling a little 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 when using one hand to control the gear-shift lever through a definite design of positions. And several other current cars don’t possess any traditional gears at all in their transmissions.
But whether or not a vehicle has a fancy automatic, an old-school manual or a modern-day constantly variable transmitting (CVT), each unit must do the same job: help transmit the engine’s result to the generating wheels. It’s a Variable Speed Transmission complex task that we’ll make an effort to make a bit simpler today, you start with the basics about why a tranny is needed in the first place.
Let’s actually begin with the typical internal combustion engine. As the fuel-air blend ignites in the cylinders, the pistons begin upgrading and down, and that motion is utilized to 
spin the car’s crankshaft. When the driver presses on the gas pedal, there’s more fuel to burn off 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 functionality with the wheels moving slower compared to the engine, while with a higher gear, optimum performance comes with the wheels moving faster.
With a manual transmission, gear shifting is handled by the driver via a gear selector. A lot of today’s vehicles have five or six forward gears, but you’ll find older models with from three to six ahead gears offered.
A clutch can be used to transmit torque from a car’s engine to its manual transmission. The various gears in a manual tranny allow the car to visit at different speeds. Bigger gears offer lots of torque but lower speeds, while smaller gears deliver much less torque and invite the car travel more quickly.