If it's not the same trans, it will not work. I think you said in the OP that it's the AX4S, as long as you find a AX4S, all should be fine. It's when you switch AX4S with AX4N that you run into problems, and I doubt you could run it on the Taurass computer. That is unless you could get the AX4N in the windstar, and you were to find the computer for one of those. Things get crazy when switching computers into the wrong vehicle. The one we did was all fine except we had to have the thing programmed to accept the key, as it was new enough that it used the transponder keys, which I'm doubting your van would have. I can't remember, is the van a 3.0, or a 3.8?