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Originally Posted by QWKSNKE
If I am not mistaken, only the 5-speed machs come with a forged crank.
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There isn't a flexplate to bolt up to the Cobra crank, so the autos come with a GT crank. That's why the 5 spd cars have a 6800 rpm redline while the autos are closer to 5800. In all the comparisons I've seen, the 5 spds ran about .5 sec faster in the quarter.