I recently acquired a unusual problem. I have a 1957 ford fairlane 500 2-dr. hdt. with a 312 engine and 3-speed manual trans. with overdrive. This spring I replaced the solenoid and the governor....all was working fine. All of a sudden after driving the car some miles, I cannot pull out the overdrive lever. If I let it set for awhile (the time varies) I can pull it out and have "normal" drive. As I have analyzed this in my mind it almost seems like "temperature" may be causing the problem. Can someone give me help ?