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What Causes Abnormal Movement When Shifting Gears in an Automatic Transmission Car?

2 Answers

StNorah

07/29/25 7:09pm

Abnormal movement when shifting gears in an automatic transmission car is mainly caused by vibrations from gear engagement or excessively thick transmission gear oil. The abnormal movement 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 due to vibrations from gear engagement, which is a normal phenomenon. In an automatic transmission, the onboard computer controls gear shifts. When the driver issues a shift command, the computer automatically shifts gears as long as the engine speed is within a reasonable range, resulting in vibrations. In contrast, manual transmission drivers can control the clutch to reduce the sensation of vibration. Excessively thick transmission gear oil: If the rear body shakes when shifting gears in an automatic transmission car, it is due to excessively thick transmission gear oil with high density. This causes the drivetrain to more noticeably transmit the engine's power, leading to pronounced rear body shaking. When the car is in motion, the transmission gear oil heats up, becomes thinner, and the shaking disappears.

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DiPaige

08/14/25 1:27pm

I've encountered this issue several times with automatic transmission cars feeling abnormal when shifting gears, mainly due to potential problems in the transmission system. If your vehicle noticeably shakes or wobbles during gear shifts, first check the transmission fluid – insufficient or dirty fluid can affect torque converter operation, leading to rough shifts and vibrations. Engine issues like unstable spark plug ignition or excessive carbon buildup can also cause instability that transfers to the vehicle body. Worn suspension components may amplify vibrations, so inspect the chassis and shock absorbers for loose parts. Regular maintenance including transmission fluid changes every 2-3 years can prevent such issues. If shaking worsens, don't delay – get a professional diagnosis at an auto repair shop to avoid compromising driving safety.

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