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WEIRD NOISE

Unusual noises are the hardest transmission problems to diagnose. The main reason is that almost any part can start producing a strange sound when damaged. The fact that you can’t open the transmission and inspect it doesn’t help at all.

Transmission noises can come from:
a. Slipping belts
b. Damaged gears
c. And loose components
Types/Time of transmission noises:
a. Grinding metal noises are usually related to bearings and pulleys
b. Squeaking, on the other hand, is often a result of a slipping rubber or plastic part.
c. When the transmission is in P, the problem can come from the input shaft
d. When the lever is in D, the faulty component may be related to the output side
Troubleshooting Procedure:
When trying to identify a noise coming from your vehicle, always start with a test drive. Pay attention to details and take notes of as much information as you can.
i. look out for the fluid level when your transmission starts to be noisy. Never forget that oil pressure is what makes everything move inside an automatic transmission.
ii. not fluid-related? Then, analyze the data you have, the sound’s characteristics, and write down some of the suspected components. Your vehicle’s repair manual should be your go-to tool here. Exploded view diagrams will help you learn the location of each component.
iii. A stethoscope may also come in handy to confirm your diagnosis. Raise your car on a hoist, put it in D, and let it run while you sneak under it. Move the stethoscope around the transmission and place it over key locations. Inspect all bearings and main components.
Conclusion:
In most cases, replacing the problematic element will require the disassembly of the transmission.

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