First things first,Check the accuracy of the housing bores.The Dana 60 bearing race is 3.813 divide it by 2 equals 1.906.Measure with a straight edge and indicator across the seat areas for each side cap down to the center of the radius.If it measures less than 1.906 it is below the true centerline and if it is more it is above the true centerline.These differences must be added or subtracted to the pinion depth.If you don't know the correct pinion depth it can be calculted by measuring the thickness of the pinion head and subtracting it from the mounting distance for a Dana 60(3.125").The difference will be the depth that the pinion should be installed.If your pinion is marked +- a number,add or subtract it in thousands to your pinion depth.