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The actuall casing is the weak spot they max out at about 550 ft/lbs then they break.400 th is much stronger,but you loose OD.
 

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it depends on how much you want to spend on the trans. i know one company that will build it and it will handle 700-800HP. but you will spend about 2grand on it.. check this site out, ive used there trans in a 4x4 i had. it ran a 468 that dyno'd at 525 [email protected] and i towed my show car with it and horse trailors in overdrive and never had a problem!

http://www.redrider.us/700_raptor_transmissions.htm
 
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