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If you get serious about racing, dump that 4l60e and go for a better automatic. There are many places that make great transmissions, and some that make really crappy ones. You really need to set a plan out of what youre going to do to the car so you can match the engine/rear/weight etc to a good converter. As for swapping to a 6speed its not the best for going racing. Good luck whatever you decide.
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