Nodular cast iron, also called malleable iron, has 50% more stiffness than gray cast iron. It also has more tensile strength than gray cast iron.

That means that if the new nodular cast housing was exactly the same as the OEM gray cast housings, it would be way stronger.

Since we have been told that it is a beefed up casting, as well as being Nodular, it is way, way stronger than a stocker.

It is the gears trying to push apart, as mentioned above, that causes most failures. A stiffer casting will resist more force.

Back in the day, racers who were into the 9" looked for the "N" on the casting to pick the most desirable ones. That was before you could order any 9" part from a catalog.

R.