Chromoly Inner Front For Dana 44 Diff 30 Spline Right Hand 27.94 Long 27.94 Inch 30 Spline Inner Right Hand 4340 D44 71-77 Bronco 297X 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