
Conventional Honda automatic transmissions use a setup very similar to a manual transmission. It consists of primary, tertiary and secondary shafts, with free spinning gears. To engage the gears, unlike a manual transmission with selector forks and synchronizers, a hydraulic clutch pack is used.
The valve body sits on the side of the engine, supplying hydraulic pressure to the clutches to lock up according to the gear required. There are no planetary gearsets in this transmission, as would typically be found in other automatics. The reverse gear is a straight cut gear that's manually engaged to the 3/5 gear on the secondary shaft with a hydraulic piston.
The transmission torn down in this video is from a 2012 Honda Fit with 285,000km on it.
Skip to section in this video:
0:00 Introduction
0:53 Teardown
9:28 Analysis
13:01 Conclusion
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