From what I've been able to pick up from reqding on several sites and this one, GTM has an aftermarket TQ converter that will hold more for the AT. As well as aftermarket high gear clutches that have been deemed too weak for more than the 400ish rwhp range. The stock tranny will hold up with minor tranny mods. Valve body, converter and high gear clutches. With those mods you can run in the low 500's.
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