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Many factory driveshafts came equipped with 1310-series U-joints, which become marginal at around 450 hp. Strange uses larger 1350-series joints on its shafts for increased torque capacity. A 1310 U-joint measures 31/4 inches wide, while a 1350 joint measures 3 5/8 inches wide. Furthermore, 1310 joints have bearing cap diameters of 11/16 or 1 1/8 inches, while 1350 joints have larger 13/16-inch caps.