Check out these sites. Maybe they will be able to help you troubleshoot whats going wrong with your transmission.

http://autorepair.about.com/od/troubleshooting/a/auto_tran_probs.htm
http://www.aamco.com/troubleshooting/automatic_transmission.html

Same thing happened to me last year coming back from New Orleans to Houston. According to the dealer, the catalytic converter went out. Fotunately I had bought it as a cetified used car in 2005, warranty was still in effect.

Thanks for the answers. I went to Ford and  was quoted $2900. To rebuild at a local shop was $1800. I ended because of finances getting a junyard unit put in for $1200, I had to find the transmission myself because they were hard to get in my area. It was $500 at a salvage yard but the garage charged me $700 plus $500 to install, thus the $1200. I hope it last.