The TRAXXAS XRT 8S 4140 Medium Carbon Steel Center Driveshaft Set by GPM replaces the factory part number 7755 for XRT models. Machined from 4140 medium carbon steel, the assembly is specified to increase material strength and wear tolerance, reducing transmission deformation under load and improving drivetrain consistency. Recommended for users seeking a durable centre shaft to support sustained high performance and reduce maintenance intervals.