Product Details: Outfit your semi truck to be Ready for the Road Aheadâ„¢ with enhanced protection against mud and debris, with the Spicer 3.85" x 6.9" SPL250 Series Steel 38-Splined Driveshaft Sleeve. By utilizing a high performance splined sleeve, this replacement piece is the ideal option to keep mud, dirt, and debris away from the slip yoke. Constructed with ultra-durable materials to ensure long term reliability.