Prepare your truck to be Ready for the Road Aheadâ„¢, with the Spicer 38.976" Involute 41-Spline Axle Shaft that provides a strong and reliable axle shaft. To deliver enhanced performance in heavy duty applications, this replacement axle shaft is crafted with 41 splines to effectively distribute the torque of the vehicle. Fashioned with exact measurements and impressive strength to endure the demanding conditions of heavy duty assemblies.