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modifications for a 12 bolt

Discussion in 'The Garage' started by Tshane, Dec 1, 2002.

  1. Tshane

    Tshane 1/2 ton status

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    i have an 86 short bed chevy with a 10 bolt. i would like to replace this with an 12 bolt. What would i have to change to make this axle work?? major concern is will my drive shaft i have right now work??
     
  2. Shaggy

    Shaggy 3/4 ton status

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    <font color="green"> The 12 bolt will more than likely bolt right in with no mods. </font color>
     
  3. Emmettology 101

    Emmettology 101 3/4 ton status

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    The only thing you will need to watch is the yoke size on the 12 bolt. GM put two different yokes on those. You need the large yoke to bolt it up to a 10 bolt driveshaft...

    Other than that, you should be ok.
     
  4. CHEVY 4WD

    CHEVY 4WD 1/2 ton status

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    How can you identify the large yoke?
     
  5. Emmettology 101

    Emmettology 101 3/4 ton status

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    If you have a 10 bolt rear laying around measure the yoke on it(where the u-joint lays in the yoke). I believe the small yoke is around 3 3/4" and the large yoke is around 4"...
     
  6. CHEVY 4WD

    CHEVY 4WD 1/2 ton status

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    is really it woulden matter which one you get if you have a 10 bolt yoke you can slap into the 12 bolt right?
     
  7. 87sm465np208

    87sm465np208 1/2 ton status

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    NOOOOOOOOOOOOOOOOOOoo, you can just goto napa and get the cross over U-joint, its 27$, i did it, i know. works awsome /forums/images/graemlins/thumb.gif
    and im still useing my stock driveshaft with the 12 bolt, so go fer it, i did the swap because i blew out my 10 bolt gov-loc /forums/images/graemlins/angryfire.gif but i got the 12 bolt for free /forums/images/graemlins/thumb.gif

    /forums/images/graemlins/usaflag.gif /forums/images/graemlins/truck.gif
     
  8. Emmettology 101

    Emmettology 101 3/4 ton status

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    Yes, I forgot about that. You can use the 10 bolt yoke, but you will need a special seal(not really "special" just a different part number). Most good rearend places can tell you which seal you need. If you cant find one that does, let me know and I will see if I can get ahold of the one here that told me about that swap.

    I am not big on the conversion u-joints like that 87sm is talking about. Not bad for a quick fix, but it would be cheaper in the long run to just buy the seal and find a yoke, then just run the normal joint. A stock u-joint will be easier to find than a conversion joint if you break somewhere other than home.
     
  9. Z3PR

    Z3PR Banned

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    Why go 12 bolt when ya can go to a 14 Bolt ??????????
     
  10. UseYourBlinker

    UseYourBlinker 1 ton status

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    Cause some people might wanna keep their rim's! /forums/images/graemlins/rolleyes.gif
     
  11. Z3PR

    Z3PR Banned

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    Doesn't the 14 bolt SF use the same wheel bolt pattern as the 10 and 12 bolters ???
     
  12. Swanson52

    Swanson52 1/2 ton status

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    Yep. 6 on 5.5
     
  13. K5Dan

    K5Dan 1/2 ton status

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    just keep the 10 bolt it's easy modification but you wont really be gaining anything or go with 14boltff or sf and keep your rims it's pretty much the same as putting the 12 bolt in it go's right in where do you live someone may even help
     
  14. Bubba Ray Boudreaux

    Bubba Ray Boudreaux 1 ton status

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    Well, I've gleaned some info off of someone from the site, and 15" 6 lugs can be used....... /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     
  15. K5Dan

    K5Dan 1/2 ton status

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    hip!hip!hooray!i still have mine and there purdy!
     

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