Hello, if you are referring to problems related to the transmission on this car I can tell you that to date and as far as I know the only problems that have been encountered so far are a problem with a front axle seal leak on some of them and with some of them having a problem with a slip in 3rd gear. This is with the 4T80E transmission only. In fact GM has come out with a service bulletin regarding these issues. I am not aware of any problems with the 6L50 - 80 or 90 or the 5L40 - 50E so far. If you have a specific question or issue on either of these automatic transmissions just drop me a note. Thanks
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