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driveshaft length w/axle swap

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by ftn96, Jul 23, 2001.

  1. ftn96

    ftn96 1/2 ton status

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    I have already got one answer on this, but wanted to hear more. How much of a difference in my driveshaft length will I have when I swap out my 10 botl with a 12 bolt. I have heard 1/2 shorter so far.

    Reason I ask is that Im getting ready to get a Tom woods shaft but dont want to order it qith my 10 bolt measurments if Im swapping in a 12 bolt.

    Beer!!!! Its not just for breakfast anymore!!.[​IMG]
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  2. Burt4x4

    Burt4x4 3/4 ton status

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    I wouldn't guess. If you are gettin a TWoods shaft I would want to give them the exsact measurement from yoke to yoke. That way your shaft will streach and collapse evenly when wheeling.
    .02c
    Oh and my GreenHorn R&amp;P is doing great!! Front and rear!
    well I do have a very small rear pinion seal leak. I'm hopeing all the dust from Hollister will seal that up!heheheh
    later

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
    <a target="_blank" href=http://www.geocities.com/baja/5099>www.geocities.com/baja/5099</a>
     
  3. ftn96

    ftn96 1/2 ton status

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    Yeah, now the only problem is a I need to get a 12 bolt. LOL!!
    Derf00 may have me hooked up with one, but I'd have to swap out the 3.73's with some 4.10's adn his has a LSd, so I owuldn't be able to go with a locker in the future. But LSD front and rear should get me just about anywhere I need to go.
    Pinion seal leak, you may just need to tighten the pinion nut down a nutter C-hair. I wouldn't crank it any more than 1/8 of a turn. But then again, your seal may just have gotten some dirt in there and wore the rubber out.
    Mine was leaking a bit, but tightening the nut down a hair or 2 stopped it.

    Beer!!!! Its not just for breakfast anymore!!.[​IMG]
    <a target="_blank" href=http://www.nashvillek5.freeservers.com>www.nashvillek5.freeservers.com</a>
     
  4. Burt4x4

    Burt4x4 3/4 ton status

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    hmmm. ok, I think I may need a new yoke. warn in groove may be the cause??! I will try the C-hair trick!
    Good luck with your part search!

    72K5[​IMG]Led Zeppelin[​IMG]Rock ON![​IMG]
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  5. ftn96

    ftn96 1/2 ton status

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    Hold up. If you have a grove in it then I'd fix that before tightening the nut down.

    Beer!!!! Its not just for breakfast anymore!!.[​IMG]
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  6. Your always talking about loose nuts ftn96,you figure out how big a shaft you want yet?
     
  7. CaptCrunch

    CaptCrunch 1/2 ton status

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    ftn- I just rand out to the back shed where I have my old original 10B and the 12B I'm ripping apart and the measurements are gonna end up being darn near identical. The 12B might be a 1/4" longer but that's not much... I'd measure w/ the 10B and you should be close enough. You do have some leway...

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
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  8. ftn96

    ftn96 1/2 ton status

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    Thanks you all. But I think Im gonna wait till I get it installed then get the d-shaft just in case.

    Im getitng behind on a my 12 bolt swap over here. I have only a couple of weeks here to get everything done. As it will be my everyday driver for well over 2 months.

    Beer!!!! Its not just for breakfast anymore!!.[​IMG]
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  9. Executioner

    Executioner 1/2 ton status

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    Even if it's the full 1/2" what difference would it make?
    1/2" is ok amoung freinds/driveshafts !
    Good luck
     
  10. ftn96

    ftn96 1/2 ton status

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    Well, the guy at the driveshaft place said that a 1/4 to short would cause some vibrations, and 1/4 to long and it would cause the plug to pop inside the new slip yoke cuasing the common undercarrage rust protection most of us slip yoke people came equipped with, [​IMG]

    This is a CV slip yoke driveshaft we're talking about here. But maybe dude is a bit tweaked on his measurment requirments, but if he is asking for something that acturate sounds like he's a prefectionist to me. So thus he maybe real good at what he does.
    Im just looking for some points of view from our end is all.

    Beer!!!! Its not just for breakfast anymore!!.[​IMG]
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  11. 84_Chevy_K10

    84_Chevy_K10 Banned

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    A 1/4 inch won't make the slightest bit of difference. I don't think a 12 bolt is longer, but it's possible. I know that I swapped a 12 bolt in when my 10 bolt went south and the stock driveshaft worked fine. I know I also swapped in this 14 bolt and it still works fine.

    And there's absolutely no reason why you can't put a locker in where an LSD is. You just can't put a Lockright or EZ locker or anything like that. If you change the carrier you can put in whatever you want, in fact, even the EZ or Lockright if for some strange reason you wanted to do that (I'd just put an Auburn or Detroit in there).

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

    ftn96 1/2 ton status

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    The 12 bolt Im looking at already has an Auburn LSD in it. I just need to replace the 3.73's with 4.10's.

    Beer!!!! Its not just for breakfast anymore!!.[​IMG]
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