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Odd Noise from Drivetrain 900 1996

posted by  ds960 on  Fri Jan 29 07:21 CST 2010
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last visit: Tue Nov 9 07:47 CST 2010
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I recently have noticed a loud moan coming from the rear of the car at specific speeds, say 45-55. It's loud enough to worry me. Seems like the Tach is sitting about 2500-3000 while the trans is changing gears, getting up to the speed limit. Sounds like it coming from the RR of the car during these episodes, which are sometimes constant, sometimes not. The exhaust is not plugged, have good flow. Once yo get either below or above this speed range, it disappears. Any one willing to take a guess?








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    Odd Noise from Drivetrain 900 1996

    posted by  david hunter on  Fri Jan 29 10:11 CST 2010
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    last visit: Mon Jun 30 22:10 CST 2014
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    A drive shaft center support bearing or more likely the rear transmission bushing can make a ROAD speed dependent noise as you described. Not sure what you mean when you reference rpm's while shifting.
    --
    David Hunter








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      Odd Noise from Drivetrain 900 1996

      posted by  soundmiami on  Fri Jan 29 16:06 CST 2010
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      last visit: Mon Oct 20 18:58 CST 2014
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      the center support bearing will make a moaning noise but will telegraph up through the center of the car, a RR noise could be the exhaust system bumping up against something but it shouldn't be speed dependent








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        Excellent hearing? 900 1996

        posted by  david hunter on  Fri Jan 29 18:01 CST 2010
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        last visit: Mon Jun 30 22:10 CST 2014
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        Well, when I hear something "telegraphed" into the frame of the car I cannot really tell where it comes from. Have been fooled that way several times.
        --
        David Hunter







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