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MrSelfDestruct got it. Ford released a new type of fluid called Mercon V made specifically to address that problem. You'll want to get a complete flush (the kind where they hook up your car to a machine that pumps all the fluid out, dropping the pan only gets about 1/4th of the fluid).
The problem Krycheck mentioned is the 1-2 accumulator, when it goes bad you'll get a very hard or delayed 1-2 upshift. Fortunately it's easily changed by most any mechanic, the part only costs a few bucks and it can be accessed simply by dropping the pan.
These trannies also like to randomly drop into neutral at highway speeds, which is the result of a sensor getting water in it, shorting out, and telling the computer you shifted it into neutral. There's an updated part with an improved seal.
The 4R70W isn't the best tranny, but it's fairly robust if you maintain it well and address those problems as they crop up (if not before) as they can lead to further damage if you ignore them.
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