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No slip yoke on the driveshaft means the transmission employs a large-diameter, bell-shaped flange on its output shaft. Furthermore, the forward end of the output shaft uses a higher spline count than the '12 (40 versus 28 splines), so it is not possible to backdate the '13 driveshaft and transmission output shaft to a '12 or earlier GT500. SVT figures anyone needing the strength of the '13 driveshaft would also need the stronger '13 transmission and clutch, so they recommend buying the new clutch, transmission and driveshaft as a package. Or better yet, just swap payments for a '13 GT500 and be done with it.