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73 up frame fit '72 Blazer

Discussion in '1969-1972 K5 Blazer | Truck | Suburban' started by IGOR, Dec 6, 2002.

  1. IGOR

    IGOR 1/2 ton status Premium Member

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    73 up frame fit \'72 Blazer

    I was in a wrecking yard the other day and they had a frame with axles. There was no engine/tranny/transfer case - just 1/2 ton 6-lug 4x4 axles - dana 44 in front, 12 bolt rear with u-bolts nuts down at the back - is this a first gen frame or 2nd gen? Any other tell-tale signs to distinguish the frame's year?


    If it is a 2nd gen, will if fit my '72?

    Thanks...
     
  2. '72brett

    '72brett 1/2 ton status

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    Re: 73 up frame fit \'72 Blazer

    I know the '73 was wider than the '72 because in '73 they put the from springs out farther from eachother to make for a smoother ride, I'm sorry, but I can't tell you how to tell the difference unless u had right next to one that you knew that year of to compare it too.
     
  3. Triaged

    Triaged 1/2 ton status

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    Re: 73 up frame fit \'72 Blazer

    The front springs are the same distance from each other 1st gen and 2nd gen.

    The differneces are
    1st Gen.....2nd Gen
    104".....106.5" wheelbase
    43".....45" Front spring eye to eye length
    Also the rear shock mounts are outside the frame on 2nd gens.
     
  4. IGOR

    IGOR 1/2 ton status Premium Member

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    Re: 73 up frame fit \'72 Blazer

    So would a '72 body fit on a '73 frame then?
     
  5. Muddytazz

    Muddytazz 1 ton status

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    Re: 73 up frame fit \'72 Blazer

    might have to relocate body mounts, if i'm wrong, i will be corrected /forums/images/graemlins/grin.gif
     
  6. Blazer1970

    Blazer1970 1/2 ton status

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    Re: 73 up frame fit \'72 Blazer

    The wheelbase is slightly different, and the body mount locations are completely different.
     
  7. 69K5

    69K5 1/2 ton status

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    Re: 73 up frame fit \'72 Blazer

    i looked at doing this and there was a lot to change. if i remember right the one i looked at there was an also an issue withe where the cab floor dropped on the 73 up versus 72 down. along with all the other mentioned problems. i would just keep l;ooking for a first gen.

    nathan
     
  8. R72K5

    R72K5 Banned

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    Re: 73 up frame fit \'72 Blazer

    gm did drop center cab area of frame rails down lower so that they could change the cab floor design for 73, the spring pad distances were 42.5 or 40 depending on the model of truck 67-87, wil be one or the other, it is not because of the year

    wheel base increased in 73, front wheels moved forward 2.5" according to GM info, 12 bolt and 44 used throughout the 70's, beginning in 77 some fronts were 10 bolt corp, and in 82 the 12 bolt was gone

    good luck
     

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