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How far to move spring perches?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by grafixxman, Jul 7, 2005.

  1. grafixxman

    grafixxman Registered Member

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    I just bought a M1008 and I need to know how far do you need to move the spring perches on a F/F 14 bolt to make it work in a half ton truck? Which way do you need to move them?

    And...


    Will the 400 turbo out of an M1008 work with a sbc? Is it a direct bolt in or do you have to use an adapter between the bellhousing and the back of the block?

    Thanks,

    Tyler
     
    Last edited: Jul 7, 2005
  2. 79Stomper

    79Stomper 1/2 ton status Premium Member GMOTM Winner

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    Tranny and engine conversions- As long as it is GM it will bolt to a 350 motor, whether it is a TH350, TH400 700R4 and so on. As far as the 14 bolt, depends on what it comes from.

    1 Ton truck- Not sure, no experience with

    3/4 ton- direct replacement

    3/4 ton van- this axle is 3" wider than a truck axle so you will have to move them 1.5" in from original location.

    Easiest way to do this is grind off the old ones, place axle underneath truck and line them up making sure you have equal lengths between flange on 14 bolt to springs. I tried the measuring thing and was all jacked up until the last time when I put it underneath the truck did the above way of measuring.
     
  3. sweetk30

    sweetk30 professional hooker Premium Member

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    tranny that was in desiel is going to need gas govenor and possible for best use gas convertor.

    spring perches need to go out just a bit.
     
  4. dleroy43

    dleroy43 1/2 ton status GMOTM Winner

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    Location:
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    For my 1 1/4 ton 14ff to fit;

    I grinded off the welds for the perches
    hit with hammer
    grinded the axle smooth
    put axle under truck on a floorjack (to be able to move it around)
    moved axle to get same distance between perch and backing plate
    correct pinon angle
    snugly tightned the Ubolts
    tripple checked angles, distances and fitness
    welded the perches to axle

    I rotated mine a little downward since I would be putting in a shackelflip.
    Hope this helps
     
  5. Jimbo*

    Jimbo* 1/2 ton status

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    Location:
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    1" out on each side. 1 Tons and crew cab rear ends, 40.5" center to center of spring perches, 1/2 and 3/4 tons, 42.5" center to center. Frames are the same, the difference is in the spring hangers and perches.
    Jimbo
     
  6. grafixxman

    grafixxman Registered Member

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    Thanks for the help guys. I appreciate it.

    Tyler
     

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