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you got a "SPIKE" when the t/c locked.. the only way to get an accurate dyno reading is to have matt write you a dynolock file that locks the tranny in direct and locks the converter.... otherwise you're just guessing..
but consider your HP pretty close, and know that your TQ spike is not an accurate reading, like i say, you should be in the neighborhood of 600tq w/that file...
I thought the 6.0's were like 650ft/lb stock? or does it drop that much to the wheels?