Thanks. As for the gyromatic, I know it was available in the Coronet in 1950, as I've owned two cars so equiped. The sedan's emblem even states "gyromatic" under Coronet. Since neither car was running, I've not gotten to drive a gyro equiped car, but, essentially they work as a double overdrive, where you lift your foot off the gas and when you reapply it, it "clunks" into gear, then you manually switch to high and repeat the process. Chryslers called it a "Simplamatic" transmission. Here's the wikipedia entry. Apparently it's an "underdrive" rather than an "overdrive" set up. http://en.wikipedia.org/wiki/Fluid_Drive I have a hunch this car has a truck engine that was swapped in. Did they have a higher compression ration/more horsepower than the car versions?