In a few of the newest cars out there, you can change gears simply by pressing a button, turning a knob or toggling a little joystick. Yet at the same time, plenty of different vehicles still require motorists to make use of one foot for the clutch pedal and another for the gas, all when using one hand to manipulate the gear-change lever through a distinct design of positions. And many other current cars don’t possess any traditional gears at all Variable Speed Transmission within their transmissions.
But whether or not a vehicle has a fancy automatic, an old-school manual or a modern-day continuously variable transmitting (CVT), each unit has to do the same job: help transmit 
the engine’s output to the driving wheels. It’s a complicated task that we’ll make an effort to make a little simpler today, you start with the basics about why a tranny is needed to begin with.
Let’s actually start with the typical internal combustion engine. As the fuel-air blend ignites in the cylinders, the pistons start upgrading 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 off in the cylinders and the whole 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 lower gear means optimum functionality with the wheels moving slower than the engine, while with a higher gear, optimum performance comes with the wheels moving quicker.
With a manual transmission, gear shifting is handled by the driver via a gear selector. A lot of today’s vehicles possess five or six forward gears, but you’ll discover older models with anywhere from three to six forward gears offered.
A clutch is utilized to transmit torque from a car’s engine to its manual tranny. The various gears in a manual transmitting allow the car to visit at different speeds. Larger gears offer plenty of torque but lower speeds, while smaller sized gears deliver less torque and allow the car travel quicker.