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I don't know of a more durable tranny than a well built 727 for most of what we all do. So, as far as the first 3 gears, a 518 would be as tough as any comparably built 727.

Now I don't know the limits of a lock-up converter or the OD section, but do those really need to hold all of our power in normal driving?

I plan to use a non lock-up 518 in the Cuda next year. The main body will be built just like the 727 in there now which has proven to be nearly indestructible. The OD will be beefed up, but I do not plan to ask it to hold all of power the engine is capable of making.

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