Update your semi with reliable driveshaft power when crossing rough terrain, with the Spicer 1.375" 16-Tooth Steel Driveshaft Slip Yoke that ensures you're Ready for the Road Aheadâ„¢. This replacement slip yoke allows the driveshaft to flex and move, without losing power or experiencing mechanical failure. Engineered with hardened steel to reduce wear and deliver long-term dependability.