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Rearend yolk for 12 bolt

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by MA87K5, Aug 17, 2000.

  1. MA87K5

    MA87K5 1/2 ton status

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    Where can I get a pinion yolk to fit a 12 bolt rear but use 10 bolt u-joints? Please help. I already broke one combo u-joint. I would rather use the beefier 10 bolt u-joint. Thank you.
     
  2. BigBadBowTie

    BigBadBowTie 1/2 ton status

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    Ok here is a copy of a previous post that I did on this subject.

    Ok, I know everybody's been wanting this information. I recently uncovered my receipt & here are the part numbers.

    National Seals #3896
    1350 U Joint
    10 Bolt Yoke

    These parts will allow you to run the larger 1350 U-Joint on a 12 Bolt axle. The yoke is available from GM, & http://www.sixstates.com as well as other places I'm sure. The Seal & U-Joint should be available at your local part store.

    This set up allows you to run a 10 Bolt yoke on a 12 Bolt rearend. I've been running this setup for 2 years now. If I remember right there's a small piece that needs to be removed from the seal in order for this to work, it will be obvious when you see it & it's easy to remove. (NO LEAKS)





    <font color=purple>Rick
    86 K-5</font color=purple>

    http://www.BigBadBowTie.ColoradoK5.com
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status

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    The 10bolt yoke will fit on your 12 bolt, just swap them. I didn't think this would work, but my brother just went through this and those "2 different sizes" u-joints are expensive. So he called the Rearend guy in North Jackson, OH., KTRE, they said it would work and it does.

    Another thing you could do is go to your local GM ealer and buy a yoke for the large u-joint, they are about $60.

    Mike
    1982 GMC Jimmy - <font color=green>Emmett</font color=green>
    http://emmett.coloradok5.com
     
  4. MA87K5

    MA87K5 1/2 ton status

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    Thank you very much.
     
  5. dumbfounded

    dumbfounded 1/2 ton status

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    The U joint problem is easily fixed. Buy both sets 12 and 10 bolt in the same brand and swap the ends you need the ears on the X are the dame diameter just the caps are machined different....

    Love, Peace, and Hair Grease...........
     
  6. BigBadBowTie

    BigBadBowTie 1/2 ton status

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    I believe you'll find that the "X" isn't the same size. The 12 bolt side is shorter with smaller diameter caps.

    <font color=purple>Rick
    86 K-5</font color=purple>

    http://www.BigBadBowTie.ColoradoK5.com
     

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