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another 12bolt bites the dust

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mudhog, Nov 4, 2001.

  1. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    well another 12bolt bites the dust. I was out wheeling in the sand and blew up the rear 12bolt today for the second time so it looks like i am now going to be looking for a 14ff. my blazer is a 77 what do i need to get a 14ff out of to bolt right in?

    wheeling videoshttp://community.webshots.com/user/ssmith6333
     
  2. Ryan B.

    Ryan B. 3/4 ton status GMOTM Winner

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    NICE!
    Well, okay not really at all.
    Man do I know the feeling. A couple times.
    Sorry to hear that man, but it just gives you an excuse to put the money towards upgrading to a 14FF!
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  4. POWERMAD

    POWERMAD 1/2 ton status

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    If that one rig is still at Kens, then the u-bolts and plates are with it so all you will need is the u-joint #338 I think.
    And of course wheels.

    <font color=green> Too bad ignorance isn't painful </font color=green>
     
  5. HarryH3

    HarryH3 1 ton status Author

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    A 14 bolt from any 73 to 87 3/4-ton truck should bolt right in. I don't think it even matters whether the truck is a 2WD or 4WD. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  6. Highlander

    Highlander 1/2 ton status

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    Hey Harry
    How do you feel about the SF 14bolt? Are the axels held in with c-clips like the 12b? Now I still have my 12b but the gears are just about shot ( it's got some chips on the teeth of both gears) The idea of the stronger axle that most likely won't brake under most wheeling is a nice thought. I know that I wouldn't be able to replace the ARB thats in both ends as well as the wheels. I know I could sell them. Oh well it's a never ending cycle.

    Eric

    <a target="_blank" href=http://cethern.tripod.com/erics-home-page-and-other-stuff/>http://cethern.tripod.com/erics-home-page-and-other-stuff/</a>
    AMSOIL Dealer # 529948
    Cethern@interfold.com
     
  7. HarryH3

    HarryH3 1 ton status Author

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    The 14-bolt SF is a c-clip axle, but it's WAY stronger than a 12-bolt. I wouldn't be too worried about running one. It's pretty rare to break a rear axle shaft. The gears usually break first. I've never broken a rear axle, but I've shredded lots of ring gears. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <a target="_blank" href=http://www.angelfire.com/super/ThunderTruck>www.angelfire.com/super/ThunderTruck</a>
    It's a great day to be alive...
     
  8. Highlander

    Highlander 1/2 ton status

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    It's the c-clip that worry about breaking the most at lest with 14sf I could keep my wheels but I don't think a dana 60 ever come as a 6lug haha I guess only time will tell what will happen.
    Thanks Harry
    Eric

    <a target="_blank" href=http://cethern.tripod.com/erics-home-page-and-other-stuff/>http://cethern.tripod.com/erics-home-page-and-other-stuff/</a>
    AMSOIL Dealer # 529948
    Cethern@interfold.com
     
  9. BurbinOR

    BurbinOR 3/4 ton status

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    Hey Shannon, emailed ya about this - there is a 14SF w/3.73 gears for sale local, guy is in Clackamas. That would literally drop in - and same gear ratio. Let me know, we can go pick it up with my trailer and I'll help ya put it in - can do it at my house.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  10. FRIZZLEFRY

    FRIZZLEFRY 1/2 ton status

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    What blew up on yer 12 bolt?R&amp;P,spiders,carrier?Just curious

    A balanced diet is a beer in both hands.<a target="_blank" href=http://community.webshots.com/user/beaterwhang>community.webshots.com/user/beaterwhang</a>
     
  11. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    ron yes please check on that for me the rear end is now siezed up and will not move
    frank i may just need to take you up on that
    frizzlefry i am not sure what is brooken yet but will post with pics when i find out i do know it put a whole through the dif cover and not that small of a whole either lol

    wheeling videoshttp://community.webshots.com/user/ssmith6333
     
  12. 79Jimmy

    79Jimmy 1/2 ton status

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    From my understanding the C clip is not a weak area of the axle because it is not subject to any torque whatsoever. Only exposed to some side loading (any force that would pull the axle shaft out of the housing) The problem with the design is if the axle shaft breaks then you would lose the shaft out the side, but the 14SF shafts are very beefy and I've never seen a shaft break at the C clip.
    Just my 2 cents or 1.2 cents Canadian[​IMG]

    James

    79jimmy@home.com
     
  13. michaelm

    michaelm 1/2 ton status

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    i have seen dodges and chevs driving down the highway with the tire a good couple feet out of the wheel well due to c clip failure.there is a good reason they are not allowed by most sanctioned bodies.
    step up to a real, servicable full floater.
     
  14. BurbinOR

    BurbinOR 3/4 ton status

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    Just let me know what I can do to help. At least you can drive in FWD for now...........or is your comment to Ron that it WON"T allow you to do that?

    I'll call ya in the morning. Big family dinner tonight with about 15 people over.

    <font color=blue>'79 ONE TON TPI K5 - See it at---&gt;<a target="_blank" href=http://www.blazzinor.rockcrawler.com>www.blazzinor.rockcrawler.com</a>
     
  15. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  16. 84_Chevy_K10

    84_Chevy_K10 Banned

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    I haven't had any problems with my 14 bolt SF. I got it FREE!!

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

    DesertDueler 1/2 ton status

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    Its not the c clip that fails, its the axle that breaks just after the splines and nothing holding it in is why the axle comes out. I have had it happen to me once. I have yet to see a c clip break.

    86Jimmy 4"&35"MTRs,87 burb 4"&35"MT,69Firebird w/525 hp,and 70GTO live in PHX,AZ<a target="_blank" href=http://www.geocities.com/modifierperformance>My vehicles</a>
     
  18. michaelm

    michaelm 1/2 ton status

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    we always called it 'the button' boils down to the c clip design sucking, thanks for the clarification
     
  19. CaptCrunch

    CaptCrunch 1/2 ton status

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    Seems like the only downside is the C-clip design if the axle breaks. I'd like to know if anyone has ever even seen one bust.. at least one in a non-insane application or one that has not been totally negleted. I personally never have and we see quite a few in the 3/4 IFS tucks and such. Most of those rigs are neglected pretty bad, abused like mad, and have 200k on them.

    -Mikey
    1987 Chevy K5 Blazer- 350 TBI
    <a target="_blank" href=http://coloradok5.com/gallery/captcrunch>http://coloradok5.com/gallery/captcrunch</a>
     
  20. Mr.Chevy4x4

    Mr.Chevy4x4 1/2 ton status

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    Hey HarryH3,
    I broke the axle in a 14sf right there in your neck of the woods. I was living in the springs durring the blizzard of '97(September???). I was out pulling vehicles out of the snow when I came across a couple of Army guys who had stuck their Hummer in the ditch. I was up on the pavement trying to pull them out when I heard a loud pop. I told them to keep digging and I would be back to try again. I got about 50 yards down the road and the right rear of my truck hit the ground. Snapped the axle off right at the splines. So, they can be broken, but they are definitely stronger than a 12 bolt.

    '85 K5 : Run it til it breaks, then fix it and go again!
     

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