Chromoly For GM 14T & 11.5 Diffs 30 Spline 38.8 Cut To Length 14T 10.5 Inch & 11.5AAM GM 30 Spline 4340 (34.8 Inch -38.8 Inch Cut To Length) (8x3.563 Inch ) Left Hand & Right Hand Srw 11.5 Inch & Some Drw 11.5 Inch Yukon Gear & AxleYukon performance axles are built with high tensile strength 4340 chromoly, use superior production methods that include cold roll formed splines, and feature advanced 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