Chromoly Outer Front For Dana 30/44 Diff 27 Spline 8.72 Long 8.72 Inch 27 Spline Cj & Scout Outer Front Stub D44 & D30 297X 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