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Transmissions are rated by TORQUE; not hp. The ZF S5-42 can handle 420 lb-ft; the ZF S5-47 can handle 470; the 5R55E can handle 550; the 4R70W can handle 700; the E4OD/4R100 can handle 1,000.
 

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That's misleading. The torque rating of the automatics is after the torque converter multiplies torque. The torque ratio on most converters is usually about 1.8:1 to 2.2:1.
 

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Plus I don't think anyone has to worry too much about a trans, nobody gets anywhere near 500 HP out of a 7.3 IDI.
 
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