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2 piece rear main in place of 1 piece rear main

Discussion in 'The Garage' started by MudFlap, Sep 20, 2004.

  1. MudFlap

    MudFlap 1/2 ton status

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    My buddy has a 86 K20 and it needs a motor, so it is supposed to be a 1 piece rear main seal. What has to be done to use a gm crate motor with a two piece rear main?

    Thanks

    Trey
     
  2. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    All you need is the proper flywheel/flexplate , same tooth count as his original , just needs to bolt on to an older motor . GM sells these . You can bolt all his original accessories and brackets onto a one piece main motor . Piece of cake , its a small block /forums/images/graemlins/k5.gif /forums/images/graemlins/k5.gif
     
  3. MudFlap

    MudFlap 1/2 ton status

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    Thats all that I thought that was needed to be done.

    Thanks

    Trey
     
  4. MudFlap

    MudFlap 1/2 ton status

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    One more question. Does anybody know or can somebody tell me any east way to check how many teeth are on the flexplate? Don't say count them, I am looking for an easier way than that, the motor is still in the truck.

    Thanks

    Trey
     
  5. 83ZZ502_Jimmy

    83ZZ502_Jimmy 1/2 ton status

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    Most likely its a 168 tooth.

    A 14" flexplate is 168 tooth
    A 12.75" flexplate is 153 tooth.

    If your buddy has a "stock" starter. Its pretty easy to tell.
    A 14" will have a diagonal "staggered" bolt pattern.
    A 12.75" will have a parallel bolt pattern.

    14" Starter
    [​IMG]

    12.75" Starter (nose)
    [​IMG]


    Staggered
    - *
    *

    Parallel
    - * *

    John
     
  6. MudFlap

    MudFlap 1/2 ton status

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    thank you

    Trey
     

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