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Message: <blockquote data-quote="dsrtjeeper" data-source="post: 1589494" data-attributes="member: 20897">Not everyone. Look into the new Mustang crowd. One driveshaft manufacturer discontinued their aluminum shafts for them due to so many issues with vibrations. The ideal aluminum shaft for our cars would be 4" in diameter and thicker than the Ford Racing shaft. Unfortunately, we can't fit a 4" shaft under our cars. I tried the calculations for critical speed. You have to know the thickness of the aluminum to do so. I'm baffled by the numbers too. Carbon fiber shafts aren't just for weight savings. They often fix vibrations. Something to consider is not all driveshaft balancing machines are alike. If your shop can only balance the shaft with the yokes removed, they're worthless. It's important that the shop has the capability to balance with yoke installed and at high speeds. Many shops balance shafts at under 1000rpm.</blockquote>