In a manual transmission, the gears are shifted manually by the driver. When you shift gears, you are actually moving the gearshift lever, which in turn moves the gears inside the transmission. This causes the gears to engage with each other and transfer power from the engine to the wheels. The noise that you hear when you shift gears is the sound of the gears meshing together.
In an automatic transmission, the gears are shifted automatically by the transmission control unit (TCU). The TCU uses sensors to monitor the engine speed and the vehicle speed, and then shifts gears accordingly. This means that you don't have to manually shift gears, but the transmission will still make a noise when it shifts gears. The noise is the same as the noise that you hear in a manual transmission, but it is usually less pronounced.
In addition to the noise of the gears meshing, you may also hear other noises when you put your car into gear. These noises could include:
* The sound of the engine revving up. This is normal when you put your car into gear, as the engine needs to increase its speed in order to move the car.
* The sound of the wheels turning. This is also normal, and the sound will vary depending on the type of surface you are driving on.
* The sound of the wind rushing past your car. This is also normal, and the sound will vary depending on the speed you are driving.
If you hear any unusual noises when you put your car into gear, it is important to have your car checked by a qualified mechanic. These noises could be a sign of a problem with the transmission or other parts of the car.
