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A 915 is fine for either a 3.0 or a 3.2. It will last forever, if you take care of it. The issue people have with the gearboxes isn't the torque capacity, it's worn synchromesh. In that respect, neither one of them will last in the hands of an idiot. The Borg Warner synchros used in the G50 gearboxes will wear prematurely if they are shifted too fast, especially when cold. I've seen damage in as little as 10,000 miles. As far as I'm concerned, the later design promotes faster shifting, "because you can". It doesn't mean it's a good idea.
My point was, you shouldn't automatically assume that a G50 is in any better shape than a 915, just because it's a so-called "better" design.
And, the G50 gearbox is heavier. As is the 3.2 engine, and just about every change Porsche made to the cars, year by year. That's why I like the early ones...
JR
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