The 400 will last forever, teh 700R4 wont, and it'll cost twice as much.
However, teh 700 will suposedly get you better MPG, but if you think it'll pay for the tranny over time, it better last a long time, they generally don't help MPG all that much. (although there are a few here who have managed to pull it off with real good numbers) The 700 is cooler though.
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