I would use a T-56 6-speed. They are rated at 440 ft-lbs or you can get one blueprinted rated at 550 ft-lbs which blows the tremec tko out of the water. You will pay about $2000 and $3000 respectively for these trannies plus the bellhousing, crossmember, etc. But like they say , you get what you pay for. Also these are the trannies they are using on the Hennessey Viper which cranks out over 800 HP!
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