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12 bolt with 38's

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by wheelin247, Jan 17, 2001.

  1. wheelin247

    wheelin247 1/2 ton status

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    12 bolt with 38\'s

    lately i have been seeing alot of poeple have a stock 12 bolt rear and there running 38's is that possible without breaking anything ?
     
  2. 90K5

    90K5 1/2 ton status

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    Re: 12 bolt with 38\'s

    of course its possible. All the 12 bolt needs to do is turn the wheels enough to drive up and down the ramp on the trailer...

    90K5

    See my truck at <A target="_blank" HREF=http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502>http://albums.photopoint.com/j/Albumindex?u=1329584&a=9886502</A>
     
  3. Shaggy

    Shaggy 3/4 ton status

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    Re: 12 bolt with 38\'s

    <font color=green>I've actually been running 38s on a 12 bolt without any breakage for about 2 years now, and I wheel it pretty hard. I do have Moser shafts and a full case L/S though. I've had alot less luck with the Front Dana 44, I've broken several shafts, steering joints, and 2 R&Ps. 1 ton axles are in the works now though, just because I need the 60 for the front and might as well do the 14 Bolt too in order to match the lug pattern.</font color=green>

    <font color=green>Evan</font color=green>[​IMG]
    <A target="_blank" HREF=http://www.contagious-racing.8m.com>http://www.contagious-racing.8m.com</A>
     
  4. shaggyk5

    shaggyk5 1/2 ton status

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    Re: 12 bolt with 38\'s

    Hey Shaggy, Are you from the ORC board? I've seen you on there when I read over there, (i dont post over there, too much to do scanning 2 message boards) I just thought it was funny having almost the same name. Nice to meet you.

    --matt
    shaggyk5: 85 Blazer, 6" lift coming soon!
    Check out the Shag-site: <A target="_blank" HREF=http://www.geocities.com/shaggyk5>http://www.geocities.com/shaggyk5</A>
    nuthin like a heavy chevy!
     
  5. Stephen

    Stephen 1/2 ton status Moderator Vendor

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    Re: 12 bolt with 38\'s

    A lot of it has to do with your driving style, there are some that can keep 1/2T stuff together no problem, and there are some that can break 60's with 35's!
    I've had similar luck to shaggy, the front seems to break before you can really beat the rear. I ran up to a 37 with no problems on the full float 12 bolt, granted it wasn't for very long, but it worked well. You will want to pay attention to the details, full case diff, good axles, keep the weight down (especially if you stay semi floating) and maybe even truss the housing.
    They do hae AWESOME clearance!
    i think a good compromise is using the fusible clutchrings in the front so it's cheap to fix and stick with a 36 or 37" tire.



    [​IMG]
    SW-ORD
     
  6. Shaggy

    Shaggy 3/4 ton status

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    Re: 12 bolt with 38\'s

    <font color=green>Yeah Matt, that's me! Kinda sucks, I'm about 40 posts away from being a Pooh-Bah over there and here I am a Newbie or a Stranger or something here! I hesitated to use this handle here because you already had it, but I couldn't think of anything else because I've been using it for a few years already. Sorry about that...

    <font color=green>Evan</font color=green>[​IMG]
    <A target="_blank" HREF=http://www.contagious-racing.8m.com>http://www.contagious-racing.8m.com</A>
     
  7. shaggyk5

    shaggyk5 1/2 ton status

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    Re: 12 bolt with 38\'s

    hey man, Its cool, Im not pissed or nuthin, I actually hesitated when I saw that you were using it on the ORC board. At least we have two different kinds of trucks. It would be hell on everyone else if we drove the same thing. Hey! I think we actually have a Fred and a Scooby around!

    --matt
    shaggyk5: 85 Blazer, 6" lift coming soon!
    Check out the Shag-site: <A target="_blank" HREF=http://www.geocities.com/shaggyk5>http://www.geocities.com/shaggyk5</A>
    nuthin like a heavy chevy!
     
  8. flcpl4fn

    flcpl4fn 1/2 ton status

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    Re: 12 bolt with 38\'s

    i have 10-bolt stuff under my truck with 38x12.5 swappers. i did change the gearing and put in alburn lockers in the front and rear, and it has the stock axles in both the front and rear too. and i haven't broken anything and i do ride it hard offroad. but it is like what was said before, it is the way you drive it offroad not how hard it is used.

    '85 Jimmy in Jax, Fl
     
  9. wheelin247

    wheelin247 1/2 ton status

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    Re: 12 bolt with 38\'s

    what do u mean "its not hard how u drive it off raod its how its used" what do u mean by that bro ?
     
  10. ROCKBUGGYK5

    ROCKBUGGYK5 1/2 ton status

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    Re: 12 bolt with 38\'s

    u must have auburn limited shits not lockers, i dont think auburn makes lockers just lsd's and spools
    adam

    ROCKBUGGY K5 38S LOCKED AND CHOPPED
     

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