https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/4026361
1950 Buick Special Dynaflow.
The Dynaflow was an inherently inefficient design due to its sole reliance on the torque converter in normal driving. Exacerbating the situation was the dual stator arrangement, which wasted more power than the simpler three element converters used with other automatic transmissions, such as Chrysler's TorqueFlite. The multiple stators increased turbulence in the converter, even when operating in the coupling phase. Original public domain image from Flickr
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