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buying a flexplate... internal, external, tooth count??? HELP!!

Discussion in 'The Garage' started by muddysub, Dec 16, 2002.

  1. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    ok i have a 1989 GMC 3/4ton suburban with a 350 and a th400. and i have to replace my flexplate it's been cracking for a while now and my mom said she'd buy one for christmas so what do i need?

    internal or externally balanced?
    and 168 or 153 teeth?
    /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif /forums/images/graemlins/1zhelp.gif
     
  2. Beast388

    Beast388 1/2 ton status

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    For a 350, here are your choices.

    14" 168 tooth internally balanced
    12" 153 tooth internally balanced

    By 1989, the smaller flexplate was pretty much phased out. Look at your starter, if the bolts holding it on are diagonal in relationship to the flexplate, then you are using a 14 incher. /forums/images/graemlins/thumb.gif Or just slap a tape measure on it and see what the diameter is. /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/burb.gif
     
  3. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    hahaha i have an even easier way to find out, the first one i broke is hanging on my wall. /forums/images/graemlins/thumb.gif
     
  4. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    14" it is! thanks, gonna go order it .
     
  5. Beast388

    Beast388 1/2 ton status

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    If you've broken flexplates in the past, make sure you get an SFA approved one, they are a bit thicker. /forums/images/graemlins/thumb.gif
     
  6. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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  7. Beast388

    Beast388 1/2 ton status

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    That looks like an excellent choice!! /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/burb.gif
     
  8. 89GMCSuburban

    89GMCSuburban 1/2 ton status

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    Oh, hell yeah!!!
     

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