Update your semi truck with improved torque transfer, with the Spicer SPL170 Series 3.858" x 38-Spline Drive Shaft Yoke Shaft that ensures you're Ready for the Road Aheadâ„¢. By utilizing a number of notched splines, this replacement piece is able to transmit torque directly from the drive shaft to other drivetrain components. Constructed with top-tier materials to be suitable for high-performance applications, such as off-roading or towing heavy loads.