Eliminate input shaft and drum breakage in high performance applications. The input shafts are made from a heat-treated billet 300M material with a high yield strength that resists breakage and results in less shaft twisting than OEM material. Rolled splines increase the strength and density of the material in the splined areas; rather than removing material the splines are actually compacted which causes the material to be more dense in this area. The sleeved drum is made from ultra-strong 4130 steel for superior strength and durability and a SmartShell (where applicable) stops any chance of sunshell breakage.