Why Automatic Transmissions Fail

Here's a look inside a failed automatic transmission and what caused it to fail.



This Infiniti G35 AWD transmission was slipping in 4th and 5th gear. In this video, the engine and transmission is removed and the transmission completely disassembled to examine the clutches, band and drum, one way clutch, valve body, solenoid and computer, filter, pan and torque converter.


For a full explanation on how this automatic transmission works, please see this video:

https://www.youtube.com/watch?v=T7-QXpk4AVI


Skip to section in the video:
0:00 Teardown
3:35 Analysis
4:24 Clutches
8:38 Band and Drum
8:54 One way Clutch
9:22 Valve Body, Computer and Solenoids
11:45 Filter and Pan
12:43 Torque Converter


Make sure you change your transmission fluid and filter to extend its life. You can purchase supplies for that here:


Transmission Fluid:
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Transmission Filter Kit:
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Fluid transfer pump:
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Fluid Funnel:

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Socket set:
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Reference videos:
How a FWD Transmission Works:
https://www.youtube.com/watch?v=LkK2XFnmfhU

How a Torque Converter Works:
https://www.youtube.com/watch?v=1g7ll8Zsn0w

How to Change Transmission Fluid and Filter (with dipstick):
https://www.youtube.com/watch?v=EIJ5DOrVl7o

How to Change Transmission Fluid (without dipstick):
https://www.youtube.com/watch?v=Aa5p4Sx9apU

How a Differential Works:
https://www.youtube.com/watch?v=e-VvLw7pjk0

How a CV Axle Works:
https://www.youtube.com/watch?v=auQ65qno2Eo


This is the Camera I use:
https://amzn.to/2Y24ixX (US)
https://amzn.to/2Yhb3eo (Canada)

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