I have in my garage a Dana 60-2. I have modified it for use in my 1987 Dodge D100. I think the only difference between the D60 and the D60-2 is that the axle tubes are 2.875" in OD and the D60 can have tubes as big as 3.125" in OD. I was able to identify it by the 6 digits on the back of the right side axle tube and that corresponds to a Jeep J-20 rear axle and was obviously not a steer axle. So I think the center casting is the common part around which a rear end is built with pieces to match the application