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September 25, 2010 at 10:47 pm #7109
The 1962 Service Manual calls it a “four speed automatic” and even shows the four different hydraulic flow paths in the color diagrams, but in reality this trans is pretty much the same internally as the three speed auto. The “fourth” speed comes from the way the “accelerotor” is used to change the torque multiplication in the converter. This is similar to how the switch pitch transmissions from 1964-67 operated.