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whats a 12bolt worth?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by timebomb1602, Apr 22, 2001.

  1. timebomb1602

    timebomb1602 1/2 ton status

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    Hey I know a guy with a extra 12 bolt what is it worth? It has 3.08s or 3.42 in it.........will it bolt up to my 91 with out any problems?




    <font color=red>1991 GMC Jimmy 350tbi 3.42</font color=red>[​IMG]
     
  2. CaptCrunch

    CaptCrunch 1/2 ton status

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    You already have the 30 spline 10-bolts so that is the same, only real difference is a slightly larger pinion. You'd probably be better off sticking the money into some aftermarket axles for your 10B instaed IMO. Seems like a lot of work just to upgrade to a 12B. If the gears differ then you need to change the frt's too... so unless you found a set w/ gears that would work better for you why go through the hassles. I'm going from a 10B to a 12B, but mainly is for the 4.11 cogs in her. Just my $.02 anyways.

    [​IMG]
    1987 Chevy K5 Blazer- 350 TBI
     
  3. 87 mid canada k5

    87 mid canada k5 1/2 ton status

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    Ya, I just read in Four Wheel and Off-Road that the cost of changing over to a 12 isn't really justified, it's not a whole lot stronger than the ten bolt. That's they're opinion, others may feel differently, they say if you're gonna spend the money, spend a little more and go full floater. Makes sense to me.

    Denis
     
  4. ftn96

    ftn96 1/2 ton status

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    Well, the 12 bolt I think is the way to go. If you are a part timer. The axles them selves are about 30 thousandths larger than the 10 bolts. Which aint much but that might be all that you need to prevent them from breaking the next time your out. And the little extra on the carrier is always good too. The 12 bolt id definately better than the 10. If the 12 bolt matches your current front differential gear ratio, GO FOR IT.
    You should look to pay no more than $200, and that is if it is in good shape.

    Will work for beer, parts and tools.
    90 Jimmy 350TBI-TCI 700R4-241-33" BFGs-10 bolts w/4.10's,
    <A target="_blank" HREF=http://www.nashvillek5.freeservers.com>http://www.nashvillek5.freeservers.com</A>
     
  5. LittleJimmy

    LittleJimmy 1/2 ton status

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    Is it the front or rear. I am getting a 14 bolt rear and a 12 bolt front. Whole deal is for 500.00. It is off a 3/4 ton set up. 1 tons are the ones that need mods to the spring perch.
     

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