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Spring perch widths

Discussion in 'The Garage' started by ntroffroad, Nov 9, 2005.

  1. ntroffroad

    ntroffroad Newbie

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    Does anyone know what the spring perch width is in the rear of a 72 K5 vs. a 78 K5?
    Thanks in advance.
     
  2. shane74

    shane74 1/2 ton status

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    '72 & older = 41.5"
    '73 - '91 = 42.5"
     
  3. ntroffroad

    ntroffroad Newbie

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  4. Beast388

    Beast388 1/2 ton status

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    I must disagree my good sir......

    The 1972 & older 4X4 spacing is 40" center to center. :D
     
  5. ntroffroad

    ntroffroad Newbie

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    Great, 2 different answers. When I measured, I thought it was 41 1/4" so the 41 1/2" sounds better than 40"
     
  6. Beast388

    Beast388 1/2 ton status

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    Where are you measuring?

    My rear axle is a 14BFF from a '77 3/4 4X4. I had to move the perches from 42.5" to 40" to get under my '71 Burb. 1972 and older 4X4's measure 40" center to center of the perch......that is 100% correct. :D

    1972 and older 2 wheel drives with leaf-springs have a 42.5" spacing.

    Are you measuring a 2wd or 4wd?
     
  7. 81jimmyslt

    81jimmyslt 1/2 ton status

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    the one ton axle I have was 40.5 " and I had to move each side one inch out for my 81' blazer to 42.5"
     
  8. shane74

    shane74 1/2 ton status

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    DOH!! :doah: You're right! For some reason the newer 2WD dimension popped into my head. It might be because we swapped a 2WD 14BFS into a '72 4WD blazer recently. We had to narrow the perch spacing

    Sorry about that ntroffroad.
     

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