Far as I know, only the 4R70W, AOD, and AOD-E have the plugs to drain the torque converter. I could be wrong, but I don't think the A4LD had one and I'm pretty sure the C-3, 4, 5, and 6 didn't have one. It's a great idea, though. That way, when you change your fluid/filter, you can drain the case and the converter so you put almost all brand new fluid back into the tranny instead of mixing old and new fluid.