Get your semi Ready for the Road Aheadâ„¢ with reliable driveshaft power when crossing rough terrain, with the Spicer 1.375" 16-Tooth Steel Driveshaft Slip Yoke. With a Y-shaped design, this replacement slip yoke allows the driveshaft to move or flex without losing power or experiencing mechanical failure. Manufactured with hardened steel to minimize wear and provide long-term dependability.