MATERIAL ALLOY STEEL;HEAT TREAT ROCKWELL C MIN 32 TO MAX 36;INTERNAL SPLINE DATA 16/32 PITCH 33 TEETH PITCH DIA 2.0625 IN. ROOT DIA 2.154 IN. 30 DEGREE PRESSURE ANGLE TID 2.125 IN.;EXTERNAL SPLINE S PITCH SPECIAL 75 TEETH 10 DEGREE PRESSURE ANGLE PITCH DIA 15.000IN. TID 14.800 IN. ROOT DIA 14.700 IN.;OD MIN 3.670 IN. MAX 3.730 IN. ID MIN 2.011 IN. MAX 2.016 IN.;MOUNTING HOLES DRILL MIN DIA 0.980 IN. MAX DIA 1.020 IN. 16 HOLES EQUALLY SPACED;ABOVEAND BELOW HUB DRILL 4 HOLES DIA OF 1.3125 IN.;ON HUB 12 HOLES EQUALLY SPACEDDIA OF 0.2812 IN.