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Thread: My 2005 CTS has a whine....

  1. #16
    Join Date
    Jul 2003
    Location
    Dallas, Texas
    Age
    61
    Posts
    543

    Re: My 2005 CTS has a whine....

    Quote Originally Posted by jrcase
    The service advisor said to bring it in. I asked if this was a common problem to see what he would say. He said he has had a few cars that had a howl and they replaced the whole differential. He said it was far from common, however. My fear is that I will go through the swap and get the same part with the same result. I have read on these forums that GM has made a new and improved differential (different part number) but my dealer knew nothing of this. NOT a good sign. Also, I worry about the BRAND NEW CAR being taken apart and not be the same afterwards. It is nice and tight and rattle free now and I want to keep it that way. I hate this.....
    Replacing the rear diff will not induce interior rattles, if it does you have far more serious problems to deal with.


  2. #17
    Join Date
    Jul 2004
    Posts
    40

    Re: My 2005 CTS has a whine....

    When they ship the differential, does it come with the required fluid already in it? Also, I understand there is a special additive needed (limited slip fluid) or is that only for the CTS-V?

  3. #18
    Join Date
    Mar 2004
    Posts
    72

    Re: My 2005 CTS has a whine....

    Special additive for limited slip differentials is the standard in the auto industry. One oil manufacturer that I am aware of, Amsoil, claims their diff fluid does not need the additive and some very high power tuners agree with Amsoil's claims. For me, use a bottle of the additive. Cheap insurance......

  4. #19
    Join Date
    Jul 2004
    Posts
    40

    Re: My 2005 CTS has a whine....

    Anyone know if the fluid is already in the differential when shipped?

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