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First - which transmission does your van have? AX4S (AXOD METRIC) or AX4N?
Either of those transmission were available behind 3.8 tauruses. I believe they had 3.77 or 3.99 in the windstars and 3.21 in the Tauruses.
A trans swap (and retuning the computer to compensate) would be a good idea. Higher gearing and turbo help.
What would scare me is the underhood temps. It's a cramped engine bay, not a lot of room to do anything. I would be afraid of more heat causing headgaskets to blow more frequently.
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