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Out of nowhere, my car has lost its ability to shift into 3rd gear. It is an automatic '69 Mustang and suddenly, the Drive gear only goes to first, so I had drive it in 2nd. It is also suddebly running very rough. Does anyone have any theories? I checked the trannie fluid and it is OK.
Check to see if your blowing smoke out the back of the car, if it is, you may have a ruptured vacume modulator and could be sucking ATF into your motor. As a confirmation just pull the rubber connection hose between the line and moulator off, and if it's full of fluid. Replace the modulator.