Thanks Gary,Steve and Dave. I will be totally honest now and explain that I 'm one of those type of rodders that doesn't really understand the fine points of how the internal parts of certain auto bits work. Like I have absolutely no idea of how an automatic transmission works and really don't care to learn as if something broke in mine,it would be taken to the expert to be rebuild. But as my old Father used to say," the day you die,is the day you stop learning" and the other saying that I got from Jim Robinson is "the only stupid question there is, is the one not asked" so excuse me for asking,but that locked diff in that modified car really got to me as it sounds really healthy coming down the street then when he turns out of the street the car makes a real loud scruffing sound from the rear.