When you're rebuilding your 68RFE, or if you're building a performance transmission, SunCoast has all of the parts you need to make a reliable and durable transmission for the 2007.5-2018 Dodge/Ram 6.7L Cummins. This Billet Input Clutch Hub is manufactured from 4140 heat-treated & stress-relieved billet steel. With the increased strength of billet over cast, the input shaft spline section of the transmission will be more reliable, and less prone to failure in heavy driving situations.