newman27 : I'm not sure I ever defended the rear diff, but I will point out that, as the old saying goes, "one's perception is their reality". .......
I have been told by several of my mentors that "Perception is not reality, but to an individual, it is far more important."
misssol : i think by diff problems he is talking about not so much the leaks but the whining and the clunking, which some people here agree with gm by saying they are normal,which they are not----what i would like to see is gm come out and tell the truth and say they added the torque bar to cure the clunk problem and that the diff's that whine could be from running them low on oil instead of insulting people and blowing them off by telling them these obvious problems are normal when now ,by gm finally doing something about them ,is gm's admission that they are not--they actually had the gall to try and tell the arbitraiter at my lemon hearing, that it was normal for a new car to leave puddles of oil
This recall has absolutely nothing to do with the clunking or whining (of differentials), and does not address the leaks caused by vent issues. The fact that the repair now includes the yoke and nut makes it obvious that the problem goes beyond the seal itself, and explains why just replacing the seals did not always solve the problem.
I think it is also important to realize that there are a variety of issues with the differential, and a variety of causes for the symptoms that various people have seen.
There have been at least two varieties of clunk, one under load, and one not. The torque bar is certainly in response to the first, but is unlikely to have any effect on the second. My car exhibits the second clunk. I won't say that I like it, but I know enough about mechanical systems to understand that it is not harmful, and is not a sign of troubles to come.
Whine can certainly be caused by lack of oil, but have all of those who complain about a whine had serious enough leaks that they ignored for long enough to drop the oil level sufficiently to cause damage ? I don't think so. All gearboxes whine. Metal to metal contact causes it, although it is usually at a low enough volume that you cannot hear it. The design of the Kappa makes whine more noticeable at a lower level. That said, just because whine is normal does not mean that all whines are normal. Some are an indicator of problems, some are not. Someone has to make the judgement about which is which, and sometimes they may get it wrong.
Like whines, leaks can be normal under some circumstances. I won't try to understand what was said at your arbitration, as I was not there and have not read a transcript. Taking statements out of context is rarely a good idea.