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Why does the automatic transmission car jerk when shifting gears?

2 Answers

StJudah

07/29/25 10:17am

Automatic transmission cars may jerk when shifting gears mainly due to vibrations from gear engagement or thick transmission gear oil. The jerking can be divided into two scenarios: front body shaking and rear body shaking. Vibrations from gear engagement: If the front body shakes when shifting gears in an automatic transmission car, it is caused by vibrations from gear engagement, which is normal. In automatic transmissions, the onboard computer controls gear shifts. When the driver issues a shift command, the computer automatically shifts gears as long as the RPM is within a reasonable range, which can produce vibrations. In contrast, manual transmission drivers can control the clutch to reduce the sensation of vibration. Thick transmission gear oil: If the rear body shakes when shifting gears in an automatic transmission car, it is due to thick transmission gear oil with high density. The drivetrain receives engine power more noticeably, causing the rear body to shake visibly. When the car is in motion, the transmission gear oil temperature rises, thinning the oil and eliminating the shaking.

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Charles

08/13/25 1:42pm

I've been driving automatic transmission cars for many years, and it's common to feel a slight movement when shifting gears. This is mainly a normal phenomenon during the transmission's shifting process. For example, when shifting from neutral to drive, the torque converter engages to transmit power, and if the engine idle is unstable, it can more easily cause slight vibrations. If it's more noticeable during the first shift after a cold start, it's a common issue. However, if the movement is strong or accompanied by unusual noises, it's time for a check-up. Insufficient or deteriorated transmission fluid or aging engine mounts could be the culprits. Regular oil changes and maintenance can prevent worsening. It's recommended to warm up the car for a minute or two before driving and lightly press the brake to stabilize the car before shifting to reduce the sensation. Long-term neglect may lead to increased wear and higher maintenance costs, so don't overlook minor issues.

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