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10/12 bolt swap (yokes)

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Jul 25, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    Ok, I just returned from readying a post from 10/200 on this but came up on some more ?'s.

    Im getting a 4x4 12 bolt, I need to know if it will come with the smaller 12 bolt yoke? If so, what all do I need to know about using the 10 bolt yoke on the 12 bolt?
    Emmett said somehting about a different pinion seal, but never came up with the part number.

    Can ya hepp me????

    Did you say I have monkeys flying outta my butt?[​IMG]
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  2. ftn96

    ftn96 1/2 ton status

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    BS, now. Come on I know somebody out there has some quality info on this. Grimmy I know you and I chatted about that a few days ago. Any word?

    Did you say I have monkeys flying outta my butt?[​IMG]
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  3. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I did it once.

    Result? 3 months later, cruising up the road at 40 mph, back tires lock up, 35s stopped me from 40 mph in 50 feet.

    The spline count is the same but it just doesn't fit properly--and it leaked the whole time.

    Tim
    '84 Chevy K10, lifted, loud, fast, and 3/4 ton axles
     
  4. ftn96

    ftn96 1/2 ton status

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    Ok, Anyone else?

    Did you say I have monkeys flying outta my butt?[​IMG]
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  5. CaptCrunch

    CaptCrunch 1/2 ton status

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    IME.... the 10B yoke won't fit on the 12B... the 10B yoke is too big... But you should be ok... I figured this out after screwing around and getting the wrong yoke at the junk yard once on my 12B and the couldn't get any other stupid yokes off the next day grr... But the on 12B's... the larger 10B sized yoke is on 4x4 ones and the smaller yoke or u-jt's piece is on one from 2wd trucks. (At least I'm pretty sure this is correct... at least from scoping out about 10 trucks at the junkyard.... some one correct me if I'm wrong) Even if you get one w/ the smaller yoke, Napa makes the conversion u-jt's for it as well as GMB. If you need it I can grab the part number of the one I have now.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</a>
     
  6. ftn96

    ftn96 1/2 ton status

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    So hopefully, or most likely the larger 12 bolt yoke should be on the rear Im getting and I shouldn't have to worry about it?

    Did you say I have monkeys flying outta my butt?[​IMG]
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  7. 89Jimmy

    89Jimmy 1/2 ton status

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    I got a 12 bolt off a '76 Blazer that I know was original and it is a smaller u-joint than the 10 bolt that it replaced. I had to use a trick u-joint.

    So MUCH to do, So LITTLE cash.
     
  8. ftn96

    ftn96 1/2 ton status

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    Ok, we've got some good conflictinf stories here.

    Looks to me that I could use the 10 bolt yoke with a different seal to fit the 10 bolt yoke and be done with it, but dude up top said his leaked all the time. And others say that is the way to go.

    But Im a little hesitant to just keep a yoke that holds a joint smaller than the 10 bolt one and the 12 bolt is supposed to be stronger. Another blunder where GM Designers had their heads up their asses, much the same as the C-clips and the slip yokes. Oh yeah, and the weak frames at the steering box.

    Did you say I have monkeys flying outta my butt?[​IMG]
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  9. dyeager535

    dyeager535 1 ton status Premium Member

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    Ok, here is my experience.

    10 bolt in my truck. Yoke was bad.

    Got a yoke from a fellow board member. Definitely not from a "10 bolt" of my trucks vintage. Thats the corporate 8.5" 10 bolt I'm talking about that my truck has.

    With the STOCK 10 bolt yoke, and a 12bolt driveshaft, I had to get an adapter u-joint. The 12 bolt side was small, the 10 bolt side large.

    When I got this replacement yoke, I was told it was off of a mid-late 70's Camaro. Wouldn't have been a 12 bolt I don't think, nor cold it have been a corporate 10 bolt. With that yoke, I had to get the STANDARD 1976 K5 rear u-joint. The yoke fits EXACTLY. Same pinion seal, same spline count on the pinion, etc. I torqued that sucker down about 5,000 miles ago, and it doesn't leak a drop, and is giving no indications of failure, nor do I expect it to.

    Some precautions: I am not sure that every "12 bolt" u-joint/yoke was the same (car,truck, whatever) I was able to use the u-joint straps from a 73-80 half ton 2wd truck on my "camaro" yoke. The uninstalled "height" (overall length of the yoke, which I was concerned about how it would bolt to the pinion) of the two yokes was the same.

    Sorry if this confuses the issue, but it really comes down to getting the piece and just seeing if it fits. Unless someones got something showing X yokes are all different X way, and yada yada.

    Dorian
    My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</a>
    No anti-theft measures on your truck? No pity when its stolen
     
  10. ftn96

    ftn96 1/2 ton status

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    I dont knwo what the hell I want to do. Now Im thinking about getting a 14 FF I found the other day for 250 with 4.10 delivered to my door. I am not good at making decisions. Can someone help me?

    Did you say I have monkeys flying outta my butt?[​IMG]
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  11. CaptCrunch

    CaptCrunch 1/2 ton status

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    LMAO! [​IMG] Yeah me too... 1/2 or 3/4... 4.10's or 4.56's [​IMG] [​IMG] ????

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://www.geocities.com/milnerlives_2000/blazer.htm>http://www.geocities.com/milnerlives_2000/blazer.htm</a>
     
  12. ftn96

    ftn96 1/2 ton status

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    Well, I've decided to go ahead and go with the 4.10 14 FF. for 200.

    Did you say I have monkeys flying outta my butt?[​IMG]
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