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Hays superbrut and sm465 help needed very much

Discussion in 'The Garage' started by gmcman7202, Nov 10, 2005.

  1. gmcman7202

    gmcman7202 1/2 ton status

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    Clutch Help sm465
    I have a 1972 gmc jimmy 4x4 with the sm465 behind a 400 sbc with hays superbrute clutch, and pressure plate, with resurfaced flywheel, new piolt and bearing.
    Now onto my question. When first installed the clutch worked aight, however now 60 miles later I am having issues with the clutch not disengaging. I have manual linkage that has some slop, which i have tried to correct with bushings ect.... Now when i am under the truck looking at the clutch disk, the sucker expands. Is this normal because its the spring loaded disk?? or is the clutch shot? In neutral the clutch is slipping, caus i can hear it rubbing , and when in gear whith the clutch depressed to the floor or any where in the travel, the truck wants to move. i have alota linkage travel so i know the fork is getting pushed pretty far, i would say about an 1.25" to 1.5", is this enough? if its not, i am lost with what to do caus i dont want to tighten it up any more, becaus its already too tight, there is no space on the fingers to the throw out bearing, which i know is bad, but i was trying to get the clutch to stop rubbing when the peddal is depresed. I am also pretty sure that i have the disk in the right way.
    I am also looking at replacing the linkage with the spherical rod ends and a tube, or maybe hydraulic. If the disk is shot and i have to replace it, i just might get a new bell housing and then go hydraulic. any and all surgestions appreciated.

    Thanks Alot guys!!!! this site has inspired me on how i can build my other 1972 jimmy to be a great truck.
    Jim

    If you can lead me in the right direction, please help me. i need to fix this soon, and i have no more other ideas, becides taking it to a shop so they can just piss on my boots and tell me its raining....
     
  2. gmcman7202

    gmcman7202 1/2 ton status

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    now i am thinking i have stumped everyone..... i know that its easier to figgure out stuff if its in front of you, however i tried to desctibe everything as best as i could. i was also talking to some guy and he said that the disk could be oil saturated, which i have no idea how this coulda happened, and thats the only thing that he could think of.....
     
  3. koldsimer

    koldsimer 1/2 ton status GMOTM Winner

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    My guess is that after the linkage and fork "broke in", they are now in a spot that is not working as efficiently. I have a hydro clutch and it took weeks to finally get my fork setup correct. It kept wanting to shift towards the ground which would put an awkward force on the throwout bearing. Check that your fork is sliding directly in and out- not binding at all. As far as the oil soak, that usually only effects the clutch by making it slip excessively-like it's worn out. Your problem is the exact opposite. I would bet that the problem is in your mechanical linkage. Double check all adjustments and make sure everything is tight.
     

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