Why does the automatic transmission car jerk when shifting gears?

[StJudah]

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.