I haven't done any A-B-A coastdown tests on the wiper cover or the underbody. I will try to do some when I do the next version of the underbody. I would like to do it out of metal as the coroplast flexes too much. I have had this version on for about 3000km and I will be changing it out in 2000km when I do my next oil change. I also plan to put a door in the next one for changing oil.
Also, regarding the question of transmission heating. I haven't been too concerned because of the open area near the wheel. Also, any air that comes in the radiator now has to travel past the engine/transmission to exit at the wheel wells or the rear of the undertray. And this van does not have a transmission cooler- I think that only came with the tow package in '97.
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