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Originally Posted by RonB
I think all the geared hubs are the same except the Alpha has the helical cut gears to quiet them a bit.
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That's what I thought as well. However, my tech manager at Lou Sobh in Atlanta (who's been working on quite a few of these trucks for quite a while) mentioned to me that the helical design actually came out earlier on some trucks (2004?). I'm not sure about that, but it's what he said...