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SM465 Noise

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MKeen, Oct 24, 2001.

  1. MKeen

    MKeen Registered Member

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    Have a 78 Balzer here and I was wondering how much gear noise is normal for a SM465. When in neutral and clutch out the transmission is kinda noisy. Push the clutch and noise completly gone. While driving I am not sure about the noise since my whoile blazer is dang noisy
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Sounds like the throw-out bearing.

    Rene

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  3. californiak5

    californiak5 1/2 ton status

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    I'm with Rene. Definitly sounds like the throw-out bearing.

    See Ya,
    Keith

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  4. HarryH3

    HarryH3 1 ton status Author

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    It takes the internals of a 465 between 6 and 9 seconds to spin down after you press the clutch. So if the noise goes away immediately upon pressing the pedal, then the throwout bearing is the most likely culprit.

    The spin down test is documented in the GM service manuals as a way to determine if the clutch is dragging. They tell you to press the clutch with the engine idling, tranny in neutral. Keep holding the clutch down, then try to shift into 1st or reverse (the 2 non-synchro'd gears in a 465) after 9 seconds. If it grinds, then the clutch is dragging and keeping the tranny internals spinning. If it doesn't, then it's working right. [​IMG]

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  5. SWAMPRNR

    SWAMPRNR 1/2 ton status

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    When you find out what the noise is let me know. I replaced the throw out bearing and clutch on mine and the noise is still there.Just getting louder. I was told it could be a bearing for the input shaft.It use to go away with the pedal pushed but not anymore.So it looks like its coming out again .And its only been in a couple of weeks.

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  6. SCOOBYDANNN

    SCOOBYDANNN 1/2 ton status

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    mine makes a little noise too, i'v e alwaysed had it, even w/ 2 new clutches and TO berings, and it does the same disappearing when clutch is depressed, i just live w/it

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