Depends on how much power you plan on for your car. thm400 trannies handle big block power. GM built them for 2-4 ton vehicles, capable of handling 500 ft.lbs. of torque.I have one behind my 350 LT-1. 35 years old and no problems. Thm400s do take a bit more to spin than a thm350 and are heavier. The ? is how much for the 383/400 and do you trust the person you're buying it from? JEGS lists thm400's at $750 for stock-$1200 for a 600+hp model.
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