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12-bolt wieght?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Sammy, Apr 19, 2001.

  1. Sammy

    Sammy 1/2 ton status

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    Me and a pall just lifted a 12bolt out of the back of my blazer. It will replace my 10bolt gov-locked p.o.s. in the futere. It was lifted in with a fork-lift, but we hand lifted it out. Now we both are kind of back broken and are wondering what we just moved. So does anyone know what a 12bolt weights?

    BTW, the 12bolt was bought for about $25. hehehehe

    "K5 Grand GT Blazer Silverado in the Netherlands."
     
  2. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    Roughly 300 lbs...When i bought my 14 bolt FF I helped load it into my truck, by hand, I was hurtin for a few days after that...534 lbs!

    Good deal on the 12 bolt BTW...

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    Is it really that heavy?? Happen to know what 10 bolts are? Thats gotta be almost double the 10 bolts weight!!


    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  4. tRustyK5

    tRustyK5 Big meanie Staff Member Super Moderator GMOTM Winner Author

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    I don't think the 10 bolt is much lighter than a 12.
    When I went and saw BlazzinOr's Dana 60 he told me the shipping weight on that bad boy was over 600lbs...[​IMG]

    Front ends are way heavier than rears...

    Rene

    [​IMG]<A target="_blank" HREF=http://jules.coloradok5.com>http://jules.coloradok5.com</A>
     
  5. dyeager535

    dyeager535 1 ton status Premium Member

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    I know I can't carry a 10 bolt very far by myself, but I can do it. The front I can only drag...I just can't believe that the 12bolt is only slightly heavier, which means I am picking up close to 300 pounds!! I'm curious as to the 12 bolts strengths...are the axles any larger, which would probably mean larger/thicker axle tubes??


    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  6. Derf00

    Derf00 1/2 ton status

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    I have a 12b on the garage floor that I weightd last night. Without the drums on it, it weighted 320 lbs. The drums on a 12b are larger than the 10b and a little heaver.

    The specs on the two axels are as follows:GM Corporate 10-bolt (8.5-in. 1.28 Axle Dia. 28 Spline)
    GM Corporate 12-bolt (8.7/8-in. 1.31 Axle Dia. 30 Spline.

    I am about to swap my 10b open rear for a 12b with Auburn Posi. If it weren't for the Posi, I am not sure I would do it because from the posts on this site, the 12b is only slightly stronger, and getting harder to find.



    Derf00
    http://www.derf00.coloradok5.com
    "Four wheel drive allows you to get stuck in a more inaccessible place."
     
  7. Emmettology 101

    Emmettology 101 3/4 ton status

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    Dyeager:

    If I remember correctly, the last issue of Petersens(or one before that) had the actual shaft diameters and stuff, but no total weights...

    I think the shaft diameters were the same for the 10 and 12 bolt at 1.28" and both were 28 spline until they changed the 10 bolt in 89 to 30 spline...

    Not sure on the axle tubes...

    tRusty - Did you know that the pinion diameter of a 14FF is the same as a 10 bolt!(according to Petersen's)



    Mike - <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>[​IMG]
     
  8. Derf00

    Derf00 1/2 ton status

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    The shaft diameters of the two are not the same. 12b is .03 larger, look at my previous post and look at the Specifications section of this site.

    Derf00
    http://www.derf00.coloradok5.com
    "Four wheel drive allows you to get stuck in a more inaccessible place."
     
  9. solowookie

    solowookie 1/2 ton status

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    the thing that really gets me about the 10 bolt is the fact that it is 3" shorther in length then the front...

    I really don't want to put spacers on because it seems like it would stress the axle too much...

    I'f I gotta swap the axle I'd just as soon go with the 'slightly' stronger variety...

    <font color=blue> Jeff </font color=blue>

    [​IMG][​IMG]
     
  10. dyeager535

    dyeager535 1 ton status Premium Member

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    I sure would like to know why GM decided to do that with the axle width. Only two three theories I can come up with are A) keeps the rear (typically driving) tires out of the front tires ruts, which creates a better chance that ONE of the tires is still on solid ground, B) that the front is actually the wide one, to increase rollover resistance when making an emergency avoidance maneuver, or C) that for some reason they were worried that the wider tires would hit the wheelwell lip. I know this has been extensively covered before, but haven't seen any conclusive evidence one way or the other!

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  11. solowookie

    solowookie 1/2 ton status

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    well who knows why the GM gods did this, but it is annoying as hell... [​IMG]

    lol...

    <font color=blue> Jeff </font color=blue>

    [​IMG][​IMG]
     
  12. Butch

    Butch 1/2 ton status

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    Supposedly it is to make the vehicle track straight down the road, but everybody that has spaced their rear out to match the front has not had any problems with it driving straight.

    I thought I was wrong once,
    but I was mistaken
     
  13. Derf00

    Derf00 1/2 ton status

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    I just weighed the drums off my 12b, 30 lbs ea. That puts the total weight about 380 lbs.

    Derf00
    http://www.derf00.coloradok5.com
    "Four wheel drive allows you to get stuck in a more inaccessible place."
     
  14. Executioner

    Executioner 1/2 ton status

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    They use the same axle/rear wheel bearing. 1.2X, and 1.3X ? take a look at the axles themselfs not just
    the specs.
    Maybe the picture will look different then (LOL)
     
  15. dyeager535

    dyeager535 1 ton status Premium Member

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    I don't buy that one...as long as the axles are oriented the same (thrust alignment) then there should be no reason any different axle length would make a difference in the ability of the vehicle to track better. In any case, the vehicle would track better when the front and rear were equal, since they would be traveling in the same "ruts" created by the front tires.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  16. MudFrog

    MudFrog 1/2 ton status

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    I won a 12 bolt off of ebay for $1. Just too bad I found out it was 5 lug.

    89 K5 Silverado
    <A target="_blank" HREF=http://mudfrog.coloradok5.com>http://mudfrog.coloradok5.com</A>
     
  17. Blazer79

    Blazer79 1/2 ton status

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    All you need to do is replace the axleshafts with Moser ones and get a disc brake kit. Excellent value.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     

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