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need some help with 12 bolt

Discussion in 'The Garage' started by luk3, Sep 8, 2003.

  1. luk3

    luk3 1/2 ton status

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    i have a 12 bolt rear that makes a clunk noise when i put it into gear and reverse, i saw somone talking about it and they said u can fix it by welding the spyder gears, can somone tell me how or give me a link on how to do that.
     
  2. MTBLAZER89

    MTBLAZER89 3/4 ton status Premium Member GMOTM Winner

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    Here is the article, but it is for a 14BFF axle. /forums/images/graemlins/eek.gif I would not reccomend doing it to a 10 or 12 bolt axle. It puts a lot of stress on everything back there and it won't last long before it spits it's guts out on the street. Try searching the forums people have discussed this happening to them in the past /forums/images/graemlins/thumb.gif
     
  3. luk3

    luk3 1/2 ton status

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    ok ty, any other way to fix it?
     
  4. heavy4x4

    heavy4x4 1/2 ton status

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    Wait 'til it breaks and replace it with a 14 bolt FF (or a six lug 14 bolt SF or a 10 or 12 bolt if you so wish...that way you don't have to get new wheels). Honestly, rearends like the 10 bolt and 12 bolt aren't worth putting money into for how cheap a "new" one can be had.
     
  5. luk3

    luk3 1/2 ton status

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    its on a 2wd truck with 280k on it its a 89 halfton
     
  6. heavy4x4

    heavy4x4 1/2 ton status

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    It's not a 12 bolt then (unless it's been swapped). Check again, you've got a 10 bolt back there and will need a 10 bolt from an 88-on 1/2 ton pickup with the right gear ratio or from a '92-on fullsize blazer or suburban. Best to probably get one from a 2wd just incase there are some quirky differences like shock mounting. Oh, and with as many smashed/junked vehicles of the above mentioned era, I wouldn't put down more than $200 for the complete rearend at a junkyard.
     
  7. luk3

    luk3 1/2 ton status

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    ya its a 10 i goofed, alrght i went to one junk yard then wanted 500 bucks for one.
     
  8. heavy4x4

    heavy4x4 1/2 ton status

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    Ask them whether it's plated in 18 or 24 karat gold.

    Go to another junkyard.
     
  9. 87sm465np208

    87sm465np208 1/2 ton status

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    yep, old rear ends have slop, my 12 bolt does, and im proud to admit it. /forums/images/graemlins/thumb.gif

    /forums/images/graemlins/usaflag.gif /forums/images/graemlins/truck.gif
     
  10. luk3

    luk3 1/2 ton status

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    lol hehe , yeah how do i find my ratio
     
  11. heavy4x4

    heavy4x4 1/2 ton status

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    If it's the original axle, look in the glovebox...there's a list of 3 digit codes. Find the one(s) that starts with a "G" and post it. I'll tell you then what ratio you have.

    That's the fastest, easiest, cleanest way to get your ratio, but it probably wouldn't hurt to pull the cover off, drain the fluid, divide the number of teeth on the ring gear by the number on the pinion, and fill it back up. You'll be able to take a look at what's going on inside then too.
     
  12. luk3

    luk3 1/2 ton status

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    ok ty ill go get it real fast
     
  13. luk3

    luk3 1/2 ton status

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    does gt4 make sence?
     
  14. heavy4x4

    heavy4x4 1/2 ton status

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