This is caused by a speed control sencer and maybe a bad linkage contact Ford dealership for advice because they might be able to suggest something because it could be a faulty trans
If any fault codes are stored the o/d light starts flashing. Most Hydraulic problems will not set any codes. But a line pressure test will show what is going on. I know that the RWD transmission designated AOD FIOD AODE A70W had problems with a sun gear shell weld that would cause no 4th gear (mechanical ) failure this could be possible in your axod,axode transmission. as well.
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Check transmission fluid warm idling wipe stick and check several times fluid seems to stay in tube and gives you false readings there is a retainer plate in valve body that breaks and causes inadvertent downshifting this requires pressure gauges on transmission to verify problem.
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