I would agree with the comment about the "strength" of the b tranny. It's got alot more aftermarket support like anything else. But, the reason for changing *I'm assuming* is the fact that on-top of the 30pounds of boost he's running a direct port nitrous system. The turbo adds power, yes, but, the instant hp that's added by the n02 just rips trannys and half-shafts to pieces. So, I'm assuming that he wanted beefier internal tranny pieces as well as beefier axles that can handle the nitrous. B/c obviously if he's using direct port then he's using some serious serious jets!
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