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SM 465 clunking

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mountainexplorer, May 10, 2002.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    At idle and not moving, the SM465 4-spd in my Suburban makes a clunking (almost a knocking) noise. It is less noticeable when the clutch is engaged and not noticeable at all when driving. What could it be?

    I already pulled a motor out because of the noise (thinking it was knocking), and now I found out it's in the tranny somewhere.(doing the exact same noise with a new motor).
     
  2. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    when you pulled out the motor did you put a new clutch in?
     
  3. wrathORC

    wrathORC 1/2 ton status

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    Yank the trans and look at the input shaft bearing and race. You'll probably find that there is a lot of chrome missing off both. While I was in there I'd replace the seals at both ends and check the output shaft bearing and race. I might even convince myself in to buying a couple new synchronizers.
     
  4. TXsizeK5

    TXsizeK5 1/2 ton status

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    This happened to me also...
    after romping one time i was sitting in a parking lot and had it in neutral and let off the clutch pedal and there was a *knock knock knock knock* type noise and i was like wtf... but the next day I checked it out and it was cool... somone told me it could be the flywheel. I have no idea =X
     
  5. mountainexplorer

    mountainexplorer 1/2 ton status

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    The clutch was a used one that I had recently put in my other truck. It was still in good shape.
    Once in a while the shifter jams in 3rd, and sometimes on a quick shift, it grinds between 3rd and 4th. It also sat half uncovered for about 6 months. When I put it in the Suburban, I drained out quite a bit of water and added new 90W gear lube.
    It also sounds like my tranny-Tcase coupler sleeve has some play in the splines. I just don't want to pull the thing out, since I just put the whole thing together, but maybe I'll have to.
     

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