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Strange rattle around torque converter

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by KRAZIE87K5, Dec 22, 2003.

  1. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Hey all-

    Just got a new muffler and tail pipe installed on the Burb today, so now I'm noticing all the other wierd noises its making. There is a rattling noise... which sounds like its coming from under the rear of the engine, right where the TC is located. Could this be a bad TQ, or should I look at something else?

    Thanks as always.

    -Dan
     
  2. outlaw612

    outlaw612 1/2 ton status

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    Is the dust cover for the TC loose?
     
  3. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    I took it off to inspect this problem, same noise.

    Here are the specs:

    96 Vortec long block
    Unknown flywheel (application wise)
    Presumably OK factory TC
    TH400/241

    The flywheel is where I get interested... I just called Autozone and found out that they don't carry the flexplate for the 96, but they do for the 87-91 350... which means that they are different...

    Anyone out there know if the 350 Vortec's are balanced internally or externally?

    Thanks,
    -Dan
     
  4. mudjunkie 82

    mudjunkie 82 1 ton status GMOTM Winner

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    check the converter bolts.....
     
  5. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Checked already... They are tight. /forums/images/graemlins/confused.gif
     
  6. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Once again, I would about bet that you have a broken flexplate. They commonly crack around the bolt holes that hold it to the crank. Sometimes you can see them if you look up there carefully with a flashlight.
     
  7. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Ok, so the question is if the 96 flexplate is different than the 89...
     
  8. dyeager535

    dyeager535 1 ton status Premium Member

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    I don't think the balancing of the first gen(?) smallblock 350 ever changed. Vortec 350 lower end is the same as any previous, short of the one piece rear main.

    The previous ones may have used dual converter bolt patterns to ine up with a TH400 or 700 or 200, but I'm just speculating on that.
     
  9. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    ALL SBC's except the 400 up until 1985 were internally balanced, starting in 1986 when GM introduced the 1 piece rear main seal engines GM externally balanced the rear only of those engines. From the info I have on hand GM only says 1985 and older or 1986 and newer for flexplates.
     
  10. Klink K5

    Klink K5 1/2 ton status

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    Cracked Flexplate
     
  11. dyeager535

    dyeager535 1 ton status Premium Member

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    If the external balance thing is correct, which now that I think about the '87 305 flexplate I have here probably is, then there would still be no reason for a flexplate break the years he was told, correct?
     
  12. 87BrnRsd

    87BrnRsd 1/2 ton status

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    The flywheel is cracked around the bolts.
    -Harrison
     
  13. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    That would be correct, I am looking in the 2002 GM performance book and it only has options for 1985 and earlier or 1986 and later. There are a couple different variables of each one but only pertaining to the TC bolt pattern and also 153T or 168T count.
     
  14. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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    Just called Napa, and they list PN 6005062, for $37. Is there a heavy duty version I can replace the factory unit with? This flexplate was AOK when I installed it just this summer... /forums/images/graemlins/blush.gif

    What makes it crack like that? Hell, its not like I tow a 8000# trailer with this truck all the time or anything... /forums/images/graemlins/rolleyes.gif

    -Dan
     
  15. HarryH3

    HarryH3 1 ton status Author

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    Look for an SFI approved flexpate. They're thicker and tested to take a lot of abuse. Summit has quite a selection for around $50. /forums/images/graemlins/cool.gif
     
  16. 84_Chevy_K10

    84_Chevy_K10 Banned

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    They crack all the time because people don't replace them when they replace the engine. It's called a, "flex plate" for a reason, and they eventually break from probably all the fatigue of flexing so many times. Either way, if you want a super heavy duty one call the mail orders and get yourself one of the super expensive ones. I personally think that a new one is all ya need though. A regular new one will be good for another 15 years or so. /forums/images/graemlins/rotfl.gif
     
  17. KRAZIE87K5

    KRAZIE87K5 1/2 ton status

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  18. laketex

    laketex 3/4 ton status

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    Awwww crap.

    This smells like work. /forums/images/graemlins/eek.gif
     
  19. HarryH3

    HarryH3 1 ton status Author

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    [ QUOTE ]
    This smells like work.

    [/ QUOTE ]
    And if we use history as a teacher, you guys will do it at 3 AM, in the driveway, during a blizzard, wearing shorts, and will somehow manage to drop the tranny off the jack at least twice. /forums/images/graemlins/eek.gif /forums/images/graemlins/wink.gif /forums/images/graemlins/thumb.gif
     
  20. thatK30guy

    thatK30guy 1 ton status Premium Member

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    [ QUOTE ]
    Awwww crap.

    This smells like work. /forums/images/graemlins/eek.gif

    [/ QUOTE ]

    You pu$$y. Get over there and help Dan out. /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
     

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