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Originally Posted by JP-s-in st. louis
Ooops how the hell did this happen? The motor should have an electronic babysitter to keep the limiter from allowing it to downshift that probably caused this.
Oh well the electronics will only save so much. It will not save it if you go from 4th to 1st instead of 4th to 3rd.
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The engine was never over revved.. It had no signs of any over rev in the valve train and the remainder of the engine looked great inside.
The driver just heard a large bang and then a rattle- He thought the engine snapped a rod in half and so did I until my initial inspection before tear down.
I have never seen a crank snap in any engine from an over rev, the first thing that sees over rev damage is valvetrain components.