I've been using an aluminum center section for 10 years now. But about every two years I get gear whine and have to replace my gears. There are many things that might be causing this (besides 700+ horsepower and track racing) but I've often wondered if the flex of an aluminum case might have something to do with it. It only saves about 10-12 lbs. Yes I know we sometimes think that is significant, but if I burn another set of gears I'm going back to a nodular case.
So no real evidence but something to think about.
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