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spring perch clarification !!

Discussion in 'The Garage' started by nstarry, Nov 22, 2004.

  1. nstarry

    nstarry 1/2 ton status

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    sombody in here said that the 1/2 ton and 3/4 ton GM trucks rear spring perches are the same
    is this right ?????????? /forums/images/graemlins/thinking.gif /forums/images/graemlins/thinking.gif
     
  2. rhuarc31

    rhuarc31 Registered Member

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    Yes in regards to placement, so if you're just swapping axle housings no problem. Rear axle tubes are different diameters I think so I dunno about fitment that way. I've been making my own from box tubing.
     
  3. Okiemuddog

    Okiemuddog 1/2 ton status

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    Yes, 1/2 and 3/4 are the same, 1 tons have a wider placement, but it is ane easy fix. Just cut them off and weld them back on at the right width. 1 tons also have a different shock mounting set up.
     
  4. nstarry

    nstarry 1/2 ton status

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    so is there a diference in the years because my 72 3/4 ton had wider springs then my 74 k5 ???
     
  5. Beast388

    Beast388 1/2 ton status

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    [ QUOTE ]
    so is there a diference in the years because my 72 3/4 ton had wider springs then my 74 k5 ???

    [/ QUOTE ]

    Here is the break down on spring perches....

    67-72 2wd 1/2-3/4 tons = 42.5" center to center
    67-72 4wd 1/2-3/4 tons = 40" c to c
    73-87(91) 2 & 4wd 1/2-3/4 tons = 42.5" c to c
    77-87 1 tons = 40.5" c to c

    I had to cut off the perches on my '77 3/4 ton 14BFF and weld on new ones at the 40" spacing to fit my '71 Burb. /forums/images/graemlins/waytogo.gif
     
  6. nstarry

    nstarry 1/2 ton status

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    you just made my day thanks for the info /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif
     
  7. sled_dog

    sled_dog 1 ton status

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    anyone know the width on a newer IFS rig? I have to put a 14 bolt under one temporarily.
     
  8. Beast388

    Beast388 1/2 ton status

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    [ QUOTE ]
    you just made my day thanks for the info /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif

    [/ QUOTE ]

    Sure! /forums/images/graemlins/thumb.gif /forums/images/graemlins/thumb.gif
     

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