In a few of the most recent 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 drivers to make use of one foot for the clutch pedal and another for the gas, all when using 
one hand to manipulate 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 regardless of whether a vehicle includes a fancy automatic, an old-school manual or a modern-day constantly variable transmission (CVT), each unit has to do the same work: help transmit the engine’s result to the generating wheels. It’s a complicated 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 combination ignites in the cylinders, the pistons begin 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 complete process moves faster 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 performance 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 possess five or six forward gears, but you’ll find older models with from three to six forwards gears Variable Speed Transmission offered.
A clutch is used 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. Bigger gears offer lots of torque but lower speeds, while smaller gears deliver much less torque and invite the car travel quicker.