With 700 hp I would say you would want the 4l85 model. I would check out the 3 part series that High Performance Pontiac just did on swapping one in a second gen bird. Other than some programming and the adapter plate (which you wouldn't need) it would work in your application. Or you could step up to the 6L80E six speed model that just came out. I am not sure on the support yet for this model. I am sure that if you do a search here you will find something on it.
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