The O/D light flash tells a trans fault is happening.
Take it to a reputable Trans shop and have it scanned. Don't guess at it. Too expensive. Check your last post as well there are replies there.

95 Contour GL. Bought new. BAT Sway Bars/Pioneer CD/Koni Rear Struts/Mobil Fluids. Looking for 15" alloy rims-PM me. 180,500km's so far.