Is it necessary to depress the clutch before shifting gears?

[SanLaura]

It is essential to depress the clutch before shifting gears, and it must be fully depressed. Failing to do so may cause abnormal noises or even clutch shuddering. During the gear engagement process, if the clutch is not fully depressed, there will be a significant speed difference between the shifting gear set and the transmission gear set, making smooth meshing difficult. In mild cases, this can accelerate wear, while severe instances may lead to gear grinding and damage to the transmission. The clutch is located within the flywheel housing between the engine and the transmission, secured to the rear plane of the flywheel with screws. The output shaft of the clutch serves as the input shaft of the transmission. While driving, the driver can press or release the clutch pedal as needed to temporarily disconnect or gradually engage the engine with the transmission, thereby cutting off or transmitting power from the engine to the transmission.

[HarperLee]

When I used to drive heavy-duty vehicles, I noticed an interesting phenomenon: trucks can shift gears without using the clutch! But this only works when the RPM is precisely matched. For our regular passenger cars, don't try this lightly. The core function of the clutch is to disconnect the engine from the transmission. If you force the gear lever without pressing the clutch, at best you'll hear a 'clunking' sound from gear grinding, and at worst, you'll ruin the synchronizer. Once, a repair shop opened up a transmission where the driver hadn't used the clutch while shifting, and the gears inside were all chipped. Nowadays, some racing cars have auto-blip features, but for everyday driving, it's safest to religiously use the clutch—after all, replacing a synchronizer costs as much as half a year's worth of fuel.

[LaJayla]

I remember my driving instructor repeatedly emphasized 'depress the clutch fully before shifting gears.' Later, I learned that the harm of not fully depressing the clutch is greater than imagined: it may seem like the gearshift succeeded, but in reality, the clutch plates are grinding in a semi-engaged state, like climbing a mountain in slippers. Especially when starting on a slope, shifting gears with the clutch half-depressed will make you clearly smell a burning odor. However, there are exceptions—some experienced European drivers perform 'clutchless shifting' on flat roads at constant speeds, but they must be more familiar with the tachometer than their own heartbeat. After failing twice, I obediently went back to using my left foot—after all, the repair costs could buy a new gaming console.

[OHazel]

Modern manual transmissions actually hide some clever tricks. With the widespread adoption of electronic throttle control, the ECU can automatically adjust the engine speed to match gear shifts. Take BMW's rev-matching function for downshifts, where the engine speed actively aligns during shifts, allowing you to gently engage the clutch to slot into gear. However, upshifts still require properly depressing the clutch, as the gearset design is directional. Once, while driving a friend's modified car where he had lightened the clutch pedal by 50%, the synchronizer rings wore out in just three months. Those who truly understand cars will blip the throttle during downshifts—not only does it protect the gearbox, but it also significantly reduces shift shock.