Chromoly Full Float Chrylser 10.5/11.5 30 Spline 40.1 Long Long Spline Cut To Length '03 & Up Chy 10.5AAM/ 11.5AAM 30 Spline 4340 (36.1 Inch - 40.1 Inch ) Ff Fits All Chy 11.5 Inch Yukon Gear & AxleYukon high performance axles are built with high strength 4340 chromoly, use superior production methods that include cold roll formed splines, and feature induction coil heat treating to create an axle of unmatched quality and durability. Yukon high performance axles are built with high tensile strength 4340 chromoly, use superior production methods that include cold roll formed splines, and feature advanced induction coil heat treating to create an