Why is there a noise when shifting into reverse gear in a manual transmission?

[MacOmar]

Manual transmissions produce a noise when shifting into reverse gear because the reverse gear in a manual transmission lacks a synchronizer. Therefore, when engaging reverse, the meshing of the gears can create a sound, which is a normal phenomenon and nothing to worry about. Before shifting into reverse, always ensure the car has come to a complete stop. If the car is not fully stopped before shifting into reverse, gear grinding may occur. Additional information: Structure of reverse gear: 1. The reverse gear lacks a synchronizer assembly, and the reverse gear pair has a straight-tooth structure. Engaging reverse involves axial movement of the gears, which directly meshes through the curved teeth at the gear engagement end. 2. The function of reverse gear is simple and singular—it allows the vehicle to move in the opposite direction, enabling reverse movement, a feature indispensable for any car. In manual transmission models, reverse gear also serves as a hill-holding brake. When parking on a downhill slope, engaging reverse gear mechanically locks the drive shaft.