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Blazer frame difference

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by extremeblazer, Apr 20, 2001.

  1. extremeblazer

    extremeblazer 1/2 ton status

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    I know the basic differences between my 1975 K5's frame and A 1990 K5's frame. It looks like the body mount behind the door is located on outriggers on the 1990 and is inside the frame on a crossmember for my 75. Was any thing else changed that I should Know about? At the local salvage yard I found a brand new GM frame for a K5. No rust, no pits, Gm black paint, and GM partnumber tags all over it. Its sitting under a 1990 K5 with no body mounts installed yet, no front end and no rear bed floor, so I can see the hole frame. Nothing is bolted on. I was told the truck was hit hard in the front and needed a new frame but was sent to the yard due to lack of funds to fix. For 200.00 I can have a brand new GM K5 frame never installed for my 1975. What do you think?
     
  2. Emmettology 101

    Emmettology 101 3/4 ton status

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    Also, the rear floors are different for those years. The 90 has a drop inthe floor for a rear passengers footwell. The frame had also been changed to accept this. The frame on the 75 will not accept this and is higher in this area. If you are putting the 75 tub on the 90 frame, it will work, but as you saidd the couple body mounts are different and the rear floor section behind the fron seat will not be supported due to the frame differences. I think it will work and I dont htink you need to worry about the floor suport much if you dont have the back seat in. If you do have it in, you may want to make some kind of support for that area.

    To be more specific, look at your rear floor in the 75. It comes all the way up to the back of the front seats. The 90 drops down about 1 foot or 1.5 feet before the back of the front seats for added foot and leg room for the rear passengers.

    Mike - <A target="_blank" HREF=http://emmett.coloradok5.com>http://emmett.coloradok5.com</A>[​IMG]
     
  3. yunit

    yunit 1/2 ton status

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    They changed the frame's I think in 78' to make room for the folding rear seat and leg room.

    1978 K5, Palisades Park, NJ 07650
     
  4. Grim-Reaper

    Grim-Reaper 3/4 ton status Author

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    Unless you have a frame problem already like bent, Rusted through or cracked it sounds like more trouble than it's worth. THAT"S a major job to swap frames and your really not gaining anything by doing it if your not changing the floor or correcting some other problem. Now if the tub was good and intact the trick thing to do would be cut off the roof and make it a roadster K5 like your 75.

    Diging it in the dirt with my K5's
    Grim-Reaper
    <A target="_blank" HREF=http://grimsk5s.coloradok5.com/>http://grimsk5s.coloradok5.com/</A>
     

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