I have to admit, fellas, that I too was wondering what was being talked about. But I hesitated asking a question and revealing my ignorance. So by being quiet I'm seeming smarter.
But I didn't know what the 8.8 was, either! I apologize for being such a chicken. 
In the same vein, 10 bolt and 12 bolt rear ends (usually referring to GM stuff) is the number of bolts on the ring gear, not the number of bolts that hold the rear cover on. Common misconception...
