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19 RPM Transmissions worked with the Driveshaft Shop to develop output shafts that mirror the shape of the stock shafts, but are made from an aerospace alloy that's stronger than 300M steel. (The manufacturing process lends the shafts a reddish color.) Just as important as the material used is the method in which the splines are created: They're rolled rather than cut or machined. This compresses the material of splines, which strengthens them.