Product Details: Get your semi Ready for the Road Aheadâ„¢ with reliable driveshaft power when crossing rough terrain, with the Spicer 2.5" 16-Tooth Steel Driveshaft Slip Yoke. Thanks to its Y-shaped design, this replacement slip yoke allows the driveshaft to move and flex without losing power or experiencing mechanical failure. Crafted with hardened steel to decrease wear and deliver long-term dependability.