Chromoly Rear Dana 44 Jeep Jl/Jt Rubicon Left Hand 32 Spline 32.2 Long D44 32 Spline 4340 JL Rubicon 32.2 Inch Left Hand SET80 (Opt. Drf) Double Drilled Rear 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