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What causes a sudden loss of gears in a manual transmission?

2 Answers

DeClayton

07/28/25 9:01pm

The reasons for a sudden loss of gears in a manual transmission are as follows: 1. Internal transmission failure: The lubricating oil inside the transmission is not fully lubricated; components in the transmission mechanism, such as gears, synchronizers, or shift forks, are damaged. 2. Clutch failure: The clutch does not disengage completely; components of the clutch are damaged. Information about manual transmissions is as follows: 1. Manual transmission (MT): Also known as a manual gearbox, it requires manually shifting the gear lever to change the gear engagement inside the transmission, altering the gear ratio to achieve shifting. 2. Composition: A manual transmission mainly consists of gears and shafts, achieving speed and torque changes through different gear combinations; whereas an automatic transmission (AT) consists of a torque converter, planetary gears, and a hydraulic control system, achieving speed and torque changes through hydraulic transmission and gear combinations.

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DeclanFitz

08/12/25 1:42am

I've been driving manual transmission cars for over a decade and have encountered this situation several times. Usually, it happens when shifting gears feels stuck or completely unresponsive during driving, which really made me anxious. The most common causes are issues with the clutch system, such as incomplete clutch disengagement, a soft pedal when depressing the clutch, or air entering the hydraulic line; or it could be due to loose or broken shift linkage, making it impossible to engage gears. When this occurs, it's best to slow down and pull over immediately, avoiding forced operation to prevent damage to the transmission. Check the clutch fluid level or listen for any abnormal sounds, but these tasks require professional tools. Safety first—that time, I directly called a tow truck to take the car to the repair shop, and after replacing a component, everything was fine. Such failures mostly stem from aging or inadequate maintenance, so regular servicing is recommended to reduce the risk.

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