Product Details: Outfit your semi to be Ready for the Road Aheadâ„¢ with reliable driveshaft power when crossing rough terrain, with the Spicer 1.965" 29/30-Teeth Steel Driveshaft Slip Yoke. To ensure the drive shaft can move and flex without experiencing mechanical failure, this replacement slip yoke is designed with a Y-shape that pairs with the U-joint. Fashioned with hardened steel to reduce wear and provide long-term dependability.