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synthetic transmission oil

Discussion in '1965-1970 Shelby Mustang GT350 & GT500' started by stallions, Apr 1, 2007.

  1. Apr 1, 2007 #1
    stallions

    stallions Member

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    has any one used synthetic transmission oil (4speed trans) ???????

    I'm using it, only driven it 60 miles or so, it seems to me I'm hearing transmission noise . Do you think I should switch back or give it a chance? 1965 mustang
    Thanks
    Kevin
     
    Last edited: Apr 1, 2007
    stallions, Apr 1, 2007
    stallions, Apr 1, 2007
    #1
  2. Apr 1, 2007 #2
    TLEA

    TLEA Well-Known Member

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    Is this an old car or new? I seem to remember something about synthetics being a no-no in toploaders.
     
    TLEA, Apr 1, 2007
    TLEA, Apr 1, 2007
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  3. Apr 1, 2007 #3
    DeLa1Rob

    DeLa1Rob Well-Known Member

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    Synthetic oils tend to be too slippery for the synchros to work properly. If you do use synthetic, make sure it is specifically designed for manual transmissions. Do not use synthetic motor oil.

    robin
     
    DeLa1Rob, Apr 1, 2007
    DeLa1Rob, Apr 1, 2007
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  4. Apr 1, 2007 #4
    stallions

    stallions Member

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    sorry its a 1965
     
    stallions, Apr 1, 2007
    stallions, Apr 1, 2007
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  5. Apr 15, 2007 #5
    s2ms

    s2ms Well-Known Member

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    I've used Redline MT-90 (GL-4 spec) in my original 66 T-10 for at least the last 10 years with great results. It is specifically formulated for manual trannys. The GL rating is very important, GL-4 has the right amount of "slipperyness" for manual transmissions. Don't use a GL-5 spec gear oil which is too slick.
     
    s2ms, Apr 15, 2007
    s2ms, Apr 15, 2007
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