Sway-A-Way axles for Toyota Tundra CV joints are designed to withstand the most demanding applications. CNC machined from solid aircraft alloy steel, heat treated, and centerless ground for a smooth consistent finish. The end diameter of all axles has been maximized for maximum face contact possible between the axle and CV, minimizing wear. The spline length has been increased by 1.75 to allow the CV to float on the axle. The axle diameter is sized to twist like a torsion bar under heavy loads absorbing a large portion of the shock transmitted from the wheel into the gearbox. The axles are marked on the end with an L for left and an R for right. Once installed, they should stay on the correct side. They can be flipped end for end as long as they stay on the correct side.Our high-performance Toyota Tundra axles sets are machined out of 4340.