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Flywheel replacement w/ tranny in place?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by PerdidoK5, Nov 26, 2006.

  1. PerdidoK5

    PerdidoK5 1/2 ton status

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    :confused: Can it be done? 79 K5, 350/350/NP203. I am working on it today. I would appreciate any advise I can get. I dont want to drop the drivetrain if I dont have to. The old flywheel has a worn spot so flat I cant get one clean revolution to start it up anymore. It's been a long time coming. :o
     
  2. 1977k5

    1977k5 3/4 ton status Vendor

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    Nope, you have to drop the tranny/t-case.
     
  3. PerdidoK5

    PerdidoK5 1/2 ton status

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    I have been out there removing the flywheel bolts. I can barely get the wrench in to them. Is it possible to drop the transfer case cross member and back out the tranny bolts a bit? Would this be a waiste of time? Thanks.
     
  4. 1977k5

    1977k5 3/4 ton status Vendor

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    I don't understand what you are trying to say.

    Now that I think about it, I bet you have an auto and are calling your flexplate a flywheel.

    I am unsure about flexplates (my truck's a 4 speed) but I think you can remove them without dropping the tranny/t-case.
     
  5. PerdidoK5

    PerdidoK5 1/2 ton status

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    Yes, I have an automatic TH350 transmission. I did not know the differance between a flexplate and a flywheel. Now I do, thank you. Flywheel=Standard Flexplate=Automatic...got it.
    Now, does anyone know if it can be done?
     
  6. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Run some 4" long bolts into the back of the motor through the bellhousing, then you can shimmy it back on the long bolts and hopefully get enough room to pull the flex plate...providing the bell doesn't hit the firewall first. You could also drop the tranny crossmember and lower the rear of the tranny for a bit more firewall clearance.

    Personally i'd just drop the whole thing though.

    Rene
     
  7. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    The tranny will have to move backwards enough for you to unbolt the flexplate and remove it then to re-install the new one. You don't have to take the tranny out but just unbolt it and slide it backwards.
     
  8. PerdidoK5

    PerdidoK5 1/2 ton status

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    Okay, thanks. Im halfway there. I have two more bolts in the tranny, then I'll drop the crossmember to allow it to slide back. I hope I don't have to do this again for a while! Thank you for your help.
     
  9. PerdidoK5

    PerdidoK5 1/2 ton status

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    Okay, here is a stupid question. I cant find a picture or an answer in my aftermarket repair manual. Which direction does the flexplate bolt on? The one I took off had the deeper "dish" toward the engine. Just looking at it, it seems like it should go the other way. There is a slight flare to the center opening. Which way does the flare face?The guy who put the thing on originally didnt know what he was doing, so I have to question the way its installed and dont dare take for granted that its correct.
     
  10. garlicbreath

    garlicbreath 1/2 ton status

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    Mine has bumps where the torque conver bolts to, so the bumps go towards the trans.
     
  11. PerdidoK5

    PerdidoK5 1/2 ton status

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    I see, yes. That makes sense. Thanks. I would hate to do all this and have it backwards!
     
  12. PerdidoK5

    PerdidoK5 1/2 ton status

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    Rene,
    Your method worked beautifuly. I finished up last night. I couldnt really drop the tranny because of where the truck was. Thanks for your help!
     
  13. colbystephens

    colbystephens 1 ton status GMOTM Winner

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    did you have space to get a torque wrench up in there? seems like it would be tight even with the extended bolts.
     
  14. PerdidoK5

    PerdidoK5 1/2 ton status

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    No, I torqued them to 3-4 grunt pounds each. Only enough room for a couple fingers or a open end wrench.
     
  15. imiceman44

    imiceman44 1 ton status

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    I've done this a couple of times. :D
    I also had to take off a torque convertor off a seized engine, now that was a bitch :o
     
  16. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Glad to help, and I'm glad it worked for ya. :waytogo:

    Rene
     

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