My 55 had an overdrive tranny in it when I purchased it last spring, but it was not working/not hooked up properly. A friend of mine, a retired mechanic, fixed it. Most of the problems in those trannys from what I have read are electrical, not mechanical. Check all the electrical connections, including checking the one fuse in the system. If yours worked previously, and if you made sure it was full of oil, there is a good chance that it is a simple electrical connection problem and not a complex mechanical malfunction. Good luck. Not sure if a regular Ford dealership might have an old mechanic or someone on hand that is knowlegable in those areas. Triker Terry