The City of Pasadena went through and rewired all residences from 120-0 to 120-0-120 many years ago. The problem was that they fused the neutral with the same size fuse as the hot leads, and when the neutral fuse blew, a number of appliances were destroyed. I bought a Pasadena house in 1974...
The older Hydramatics had fluid pumps on both the input and output shafts, so the engine could be turned over by pushing the car. I think this stopped in the mid-50's, and now, with the single pump on the input shaft, there's no pressure to work the clutches unless the engine's turning.
