One problem related to transmission gear indicator has been reported for the 1999 Ford Windstar. The most recently reported issues are listed below.
Transmission bangs hard from 1st to 2nd gear and overdrive light comes on saying od is off. This started a few months after I bought it in late 2001;it was fixed by the dealer. It started again in early 2006. Miller Ford refused to do anything about it. It was just out side of my 4 year warranty but still within the mileage. (79,000). I took it back again in 2008. They still wouldn't do anything for me. Took it 2009 they looked at it, charged me $400. 00 dollars and said I needed a new radiator and transmission. Oh well. No more Fords.