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The cast metal in the gearboxes is brittle to begin with. Once they get down below freezing they become even more brittle to the point where they break. Its the common v2 stress fracture. It is not just limited to stock boxes either , any reinforced v2 gearbox that is made of cast metal could break. The EAR Edmonton players had something like half of thier clubs aeg's go down playing in colder temperatures.
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