Chromoly Inner Front For Dana 44 30 Spline Left Hand 15.7 Long D44IFS F150 Left Hand 15.7 Inch innr Front '80-'92-1/2 30 Spline 4340 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