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12B carrier question

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CaptCrunch, Oct 2, 2001.

  1. CaptCrunch

    CaptCrunch 1/2 ton status

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    Still looking for a 14B FF w/ 4.56's and not having a lot of luck. So I might end up redoing the 12B I have... but basically I bought the 12B w/ 4.10's in it. I have no idea if it is factory or not... but does anyone know how to identify which carrier is in it (3.40 and lower or 3.73 and higher) ? It is an open carrier and if I remember right it is out of a mid to late 70's pickup. TIA.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  2. POWERMAD

    POWERMAD 1/2 ton status

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    I got this from Randy's ring and pinion.
    12 Bolt Truck 2.73 &amp; down / 2.76 to 3.42 / 3.73 &amp; up #

    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  3. Executioner

    Executioner 1/2 ton status

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    I'll try to help ya, if the ring gear was 1/3 " to far to the left or right could you notice it ?
    That's what the carrier brake does it moves the mounting of the ring gear to the left or right !
    If say you happen to have the 3.07:1-3.73:1 carrier and your ratio is 4.09-4.11:1 then you have
    an extra thick ring gear, or possibly a spacer.
    The extra thich ring gear will be about 1/3" thicker than a non-extra-thick ring gear.
     
  4. CaptCrunch

    CaptCrunch 1/2 ton status

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    Thanks for the help Ex... It doesn't look as thick as a ring gear on a smaller carrier would be. I know what you are saying. I just figured it would be good to check. Although it looks like if it was the smaller carrier I would be SOL cause they don't make it [​IMG]

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  5. DesertDueler

    DesertDueler 1/2 ton status

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    Motive makes both carriers for the 12 bolt.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     

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