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12 BOLT SWAPP

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by 85blazer350, Sep 9, 2001.

  1. 85blazer350

    85blazer350 Registered Member

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    Location:
    Grande Prairie,Alberta,Canada
    I just found out my 10 bolt rear end is goners ,but i found a parts truck for sale its an 81 k10 on propane with 12 bolt rear end .I was just wondering what all I would have to do to swapp it into my 85 k5 blazer or will it just go straight in and also would the front end go in and one more thing what would be the best gears for 35 mud kings for both power and fuel economy.
     
  2. Pugsley

    Pugsley 1/2 ton status

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    The 12 bolt will go right in - I just acquired one yesterday myself[​IMG] For gears, if you've got a 700R4, nothing less than 4.10's with 35s. If you've got the SM465 3.73's would be great.

    Clean up on aisle 3!!
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  3. mudhog

    mudhog THEGAME Staff Member Super Moderator

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  4. 84_Chevy_K10

    84_Chevy_K10 Banned

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    If you've got a 700R4, I'd want 4.56s with 35s. I have 4.10s and 35s and I always wish I had just a little more gear.

    I am swapping in an SM 465 so now I don't care.

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

    mudhog THEGAME Staff Member Super Moderator

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  6. arq

    arq 1/2 ton status

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    interesting, 4.10 or 3.73s which would be better with 35s and a sm465, how bout a th350??. I'll be upgrading to 35 in the near future and am considering 3.73s with 35 and a th350.
    what do you guys think??

    ARQ.



    1-72 4x4 CST Blazer
    2-71 4x4 CST Blazer
     
  7. Pugsley

    Pugsley 1/2 ton status

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    To me 3.73's would be ideal with anything non-overdrive. You'd only need lower for really hardcore rock crawling.

    Clean up on aisle 3!!
    <a target="_blank" href=http://pugsley.alloffroad.com>pugsley.alloffroad.com</a>
     
  8. walt88

    walt88 1/2 ton status

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    I have 700r4-373's with 35's and it is pretty bad. I wish I had AT LEAST 4.10's

    35" All-Terrains... I don't get it.
     
  9. walt88

    walt88 1/2 ton status

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    I have 700r4-373's with 35's and it is pretty bad. I wish I had AT LEAST 4.10's

    35" All-Terrains... I don't get it.
     
  10. Mreetz

    Mreetz 1/2 ton status

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    I've got 3.73s with 35x12.5s. Runs really nice. Its a daily driver so its nice to be able to keep up with everyone on the freeway.

    1984 K-5
    4" lift
    35x12.5 MTs
    buildin a 400 for it, any info greatly appreciated
     

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