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

2 Answers
JasonFitz
07/23/25 8:32pm
Here are the specific reasons for abnormal noises when shifting gears in an automatic transmission car: 1. Damaged transmission housing: Long-term wear and deformation of the transmission housing and bearing seat holes. The noise is loudest when shifting into low gears and decreases progressively when shifting into higher gears, with the direct gear being the quietest. 2. Gear surface breakage: Due to the breakage of individual gear surfaces, impact occurs during meshing. When shifting into this gear, strong impacts and vibrations are generated, causing resonance in the transmission housing. 3. Improper transmission assembly: Incorrect replacement of gears, needle bearings, or bushings in a certain gear of the transmission, leading to abnormal assembly gaps, which results in poor gear meshing and abnormal noises during transmission in that gear.
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BrookeMarie
08/10/25 6:31pm
I've been hearing a clicking sound when shifting gears lately, which is quite concerning. There could be several possible reasons: the most common one is that the transmission fluid has aged or is insufficient, causing increased friction between gears and resulting in noise during shifting. If the gear shift lever is loose, metal parts may collide and produce sounds when shifting. Mechanical issues inside the transmission, such as gear wear or bearing damage, can also cause clicking noises. Another possibility is unstable engine idling, which can lead to increased vibrations in the entire drivetrain. I recommend first checking the transmission fluid level yourself. If the fluid is too dirty or low, go to a repair shop immediately to replace it. If the noise persists, don't ignore it—make sure to visit a professional repair station for a comprehensive diagnosis as soon as possible to prevent minor issues from turning into major problems.
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