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Hello-
There are two seperate things to think about. First, the trailing arms and the geometry they give. There's no reason in the world this dictates new output shafts... it doesn't matter.
But, the second thing is CV size. All aluminum 944 arms have stub axles with the T2-sized CV, and the arms can't be "swapped" for smaller, T1-sized ones. All steel 944 arms also have stub axles with the T2-sized CV, but they _can_ be swapped for stock T1 stub axles. In either case, most of the time, an upgrade to bigger CVs is desired by the person putting in the trailing arms, so they get the tranny output shafts to match.
Take care,
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Shad Laws
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