I too have seen the two designations used as if they were interchangeable. The tag on the trans says Model NO. 30-43LE 4810179 Looking at it the 30 designation seems to refer to a two wheel drive origin, but I would assume that just refers to the tailpiece. It is now attached to the Dana 300, so that point is mootIs it really an AW4? I just looked up the 43LE and the two are often confused.