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How many people running 12 bolts?

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

  1. DesertDueler

    DesertDueler 1/2 ton status

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    I am trying to decide between a 12 bolt, 14 bolt SF, and a 14 bolt FF? Thank you guys in advance.

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  2. keith

    keith 1/2 ton status

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    ME, depdog,grim,bigjbear hope that helps!

    79 Blazer 6"lift 38 SX's locked/4:56 <a target="_blank" href=http://www.keith.rockcrawler.com>www.keith.rockcrawler.com</a>
     
  3. DesertDueler

    DesertDueler 1/2 ton status

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    That does help. Do you guys like the 12 bolts? And do the hold up well?

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  4. keith

    keith 1/2 ton status

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    We all have web pages check them out!

    79 Blazer 6"lift 38 SX's locked/4:56 <a target="_blank" href=http://www.keith.rockcrawler.com>www.keith.rockcrawler.com</a>
     
  5. DesertDueler

    DesertDueler 1/2 ton status

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    I checked out your web site. It look like you put the 12 bolt through a lot of abuse. I am leaning towards the 12 bolt now so I can keep the 6 lug pattern, and hooking up the e brake will be easy to. Now I just have to find one.

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  6. bigjbear

    bigjbear 1 ton status Staff Member Moderator

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    I'm still running stock shafts in mine, but the rest-seals, bearings, gears (4.56) and Detroit are new. I haven't broken a shaft, yet w/ 35 BFGs. I do carry a spare, though. I was going to swap in a SF14B, but there is not a Detroit for it, or at least there wasn't when I had mine set up. If I get a bigger tire I will put in aftermarket shafts.
    W/O a bigger front axle I wouldn't go with a FF14B. Here is my reason, To make up for the ground clearance I would lose I would have to run a tire that would kill a 10B or D44 front.
    I am happy with mine. It was stock so that made the choice easier. If you are swapping something in and a Detroit is available for the SF14B now (I don't know if it is or not) I would go with that. If you have a 12B already I would keep it. Just my $.02.

    Jim '80 GMC & '73 Blazer
    Tread Lightly!
    <a target="_blank" href=http://www.tellicok5.rockcrawler.com>www.tellicok5.rockcrawler.com</a>
     
  7. DesertDueler

    DesertDueler 1/2 ton status

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    There is a Detroit available for the 14 bolt SF. I dont have a 12 bolt, but a friend of mine has one he will sell. I run 35s on mine. I dont want to change the front 10 bolt or convert it to 8 lug. I know the 14 bolt SF came in 6 lug in 88-94 Chevy trucks.

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  8. dragricinMT

    dragricinMT 1/2 ton status

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    If you go with a 12 bolt you can upgrade it to a full float with the WARN axle kit. It looks pretty simple from the instructions. ORD also sells the 12b ff kit. I have over a grand invested in wheels and tires and wanted to keep them. You get all the qualities of a ff without the weight and loss of ground clearance. No more c-clips to worry about either. VERY NICE.
     
  9. DesertDueler

    DesertDueler 1/2 ton status

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    I was wondering about those full floater kit. Has anybody used this setup, and if so how do you like?

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  10. Pugsley

    Pugsley 1/2 ton status

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    Several SCORE and Whiplash racers use the Warn kit, so it's got to be tough. I'm planning on upgrading to one eventually myself.

    If the shoe fits, get another one just like it
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  11. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

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    i know it's a stupid question. but does anyone make a full floater kit for a 14bsf? i think the sf has better clearance than the ff does. (am i right?) and it would probably be cheaper to convert an axle than swap an axle.

    scott,
    1989 suburban 3/4t 4" lift soon to be rollin on 33s, tbi350
     
  12. DesertDueler

    DesertDueler 1/2 ton status

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    I know they make a kit to hold the axles in with the bearings loke the Ford 9 inch, but no full floater kit. And yes you are right it has better groung clearance.

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  13. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I destroyed my 12 bolt, so I now have a 14 SF. It works just nicely and makes a 12 bolt look puny. Plus it comes 8 or 6 lug, your choice if you're willing to buy shafts. Mine has a posi and 4.10 gears.

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

    DesertDueler 1/2 ton status

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    Is the 14 bolt SF a direct bolt in, or do I have to modify the e brake cable?

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  15. Pugsley

    Pugsley 1/2 ton status

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    The 14 SF is direct bolt in - E-brake is exactly the same on the "Heavy Half" 6 lug - I'm not sure about the 8 lug.

    If the shoe fits, get another one just like it
    &lt;a target="_blank" href=http://pugsley.alloffroad.com&gt;pugsley.alloffroad.com&lt;/a&gt;<P ID="edit"><FONT class="small">Edited by Pugsley on 08/25/01 10:23 PM.</FONT></P>
     
  16. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    I ran an open 12 bolt with 3.73 for 7 years and had no problems.I recently built a new 12 bolt(cuz I had the 12 bolt and didnt have a 14 bolt ) with a detroit,moser axles,and 4.10s.I spent about $1000 on the 12 bolt.If I would have had the 14 bolt I have now I would have built it just for the fact of knowing I would never break it.You can get an Idea of what I do to mine on my web shots page.

    A balanced diet is a beer in both hands.<a target="_blank" href=http://community.webshots.com/user/beaterwhang>http://community.webshots.com/user/beaterwhang</a><P ID="edit"><FONT class="small">Edited by FRIZZLEFRY on 08/25/01 10:33 PM.</FONT></P>
     
  17. keith

    keith 1/2 ton status

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    There is also another thing to consider. All the FACTORS that are involved in blowed up 12's
    What size tire did they run?
    What gear ratio compared to tire size?
    When was the last time they changed the dope and how often?
    What diff did they run(Gov-lock=trash,auburn=trash,)?
    And general driving habits(burn outs)?
    Have good bearings and seals?
    Think about this also!!!
    I personally think that the 12 is fine if you have good bearings and seals along with a proper gear ratio for your tire size and of coarse change dope regular.
    Most people don't know about this stuff.They just get in and drive. Thrash it hard and never check it out till it blows then they say that dang 12 bolt sucks I'm going to get me a 60.

    79 Blazer 6"lift 38 SX's locked/4:56 <a target="_blank" href=http://www.keith.rockcrawler.com>www.keith.rockcrawler.com</a>
     
  18. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    <blockquote><font class="small">In reply to:</font><hr>

    Several SCORE and Whiplash racers use the Warn kit, so it's got to be tough. I'm planning on upgrading to one eventually myself.

    <hr></blockquote>
    No shiite? I've been sold on a 9 inch for so long, even have two third members but not the housing yet. I think I could throw in the same amount into my 12 bolt as the 9 inch and get the same results. You wouldn't by chance know these racers personally, would like to talk to them.



    Bubba Ray Boudreaux,
    Leader of the Advance Party for
    the CSA revolution in the PRK!
    <a target="_blank" href=http://community.webshots.com/user/mdntrdr1>http://community.webshots.com/user/mdntrdr1</a>
     
  19. DesertDueler

    DesertDueler 1/2 ton status

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    I have a complete 9 inch Ford, but the bolt pattern is 5 on 4.5. Does anybody know if there are axles out there for 9 inches that have 6 on 5.5 so I can run matching wheel patterns?

    86 Jimmy 4"lift 35"MTRs locked front.Other cars 69 Firebird w/525 hp,and 70 GTO <a target="_blank" href=http://www.geocities.com/modifierperformance>MY vehicles</a>
     
  20. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Read an article somewhere on the web about turning the front Dana 44 into a 5 lug and it wasn't exactly rocket science. That's what my plan is. Even worked on a '72 K5 in my tire shop days that had a 9 inch out back and 5 lugs all around. Can't remember exactly what was done with the axle, but wouldn't just having custom shafts with 5 lugs for the front end work?

    Bubba Ray Boudreaux,
    Leader of the Advance Party for
    the CSA revolution in the PRK!
    <a target="_blank" href=http://community.webshots.com/user/mdntrdr1>http://community.webshots.com/user/mdntrdr1</a>
     

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