These are upgrades and as an upgrade it is best to install the strongest axle available. Some of the vehicles listed were fitted with a weaker coarse 10 Spline at the diff end. We do not recommend using these axles unless unavoidable. If ordering diff locks always use the 24 spline even in the earlier vehicles and complement it with a better 24 spline axle. Vehicles affected have".24" after the MDE Part Number.