Ensure your truck is Ready for the Road Aheadâ„¢ with a strong and reliable axle shaft, with the Spicer 43.307" Involute 41-Spline Axle Shaft. Thanks to its 41-spline design, this replacement axle shaft is the ideal solution for heavy duty vehicle assemblies that require durable drivetrains. Crafted with a precise finish to better handle torque distribution and demanding conditions.