Hello, I'm Chris. Welcome and thanks for asking your question!
You have a 4R75E transmission. You are experiencing 2 failures the forward clutch and possibly the intermediate clutch are slipping and most likely the 1-2 shift accumulator has a torn seal. The intermediate clutch (2nd) gear is the one I feel may not be slipping if the accumulator is leaking, it is going to be one or the other. I am sure though you have a forward clutch (1st) gear slipping
Your options at this time are to replace the trans with a Ford remanufactured unit, parts and labor will run about 2600$
Install a junkyard trans and have it serviced once installed. The price varies depending on how much the trans costs, average parts and labor 1200-1600$
Remove your trans and rebuild it an then reinstall it about 1900$.
Sorry for the failure you have experienced and the bad news.
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am hopefully helping you lower your repair bill or at least informing
you of the repair needed prior to getting it fixed.
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