It really isn't fair how much people like to pile on to the Strasbourg 4l30e, I was missing multiple thrust washers for nearly 100k miles and the thing was still shifting fine (only found out about this when I opened it up after the case suffered a crack). Significant metal on metal wear where the washers were supposed to be, but I couldn't tell by driving the car. the metal they made the case out of is utter crap, though.