2000 ford windstar/transmission o/d light blinking,?

Anti-lock Brake Sensors and transmission sensors are apples and oranges.

See the link. Go down the ELECTRONIC CONTROLS sensor list replacing one at a time starting with the TSS shown in the diagram.

Without other symptoms mentioned, your answer here is limited.
 
It could be a result of your abs light being on. I would have the system checked, as they are tied in together.
 
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