What is the principle of different speed ratios in high and low gears of a transmission?

[LeEmersyn]

High and low speeds are achieved through the size of the gears in the transmission. The correct usage is to use low speed when heavily loaded, as this provides greater torque, and high speed when unloaded, as this allows for increased speed. Meaning of high gear at low speed: This refers to when a manual transmission vehicle is traveling at a speed lower than the speed range for the current gear, known as high gear at low speed. Whether it's high gear at low speed or low gear at high speed, both can negatively affect the engine's lifespan. Long-term maintenance of such conditions: It can easily lead to the formation of excessive carbon deposits inside the engine cylinders. Too much carbon buildup inside the cylinders can result in difficulties starting the vehicle, reduced engine power, and sluggish acceleration, among other issues.