Overdrive Transmission for 630 HP motor

Syleng1 said

There are a few companies that will build you a 4L60 or 4L80 for you with a custom bell to match your engine.
They handle LS engines no troubles.

Try look that up.
Hope this helps.

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i think that would fit the bill nicely for what he's trying to do.

a 2004R could probably be spec'd out to take the abuse with the bonus that it's a relatively small package comparison wise.