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Tailgate Buckling When Flexing

Discussion in 'General Automotive' started by KenLyns, Mar 3, 2012.

  1. Mar 3, 2012 at 11:14 PM
    #1
    KenLyns

    KenLyns [OP] Lord of War

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  2. Mar 3, 2012 at 11:58 PM
    #2
    1980

    1980 Well-Known Member

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    Some truck frames are designed to flex in order to enhance ride quality. If you think that a completely rigid frame is optimal for all condition's you have never gone over a bump while riding the the back of an army deuce and a half. Also, truck manufacturer's will publish "tests" that are designed specifically to make their trucks look better than the competition.

    http://www.youtube.com/watch?v=EWjTbiYo3x0
     
  3. Mar 4, 2012 at 12:23 AM
    #3
    Spoonman

    Spoonman Granite Guru

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    My truck is MAGIC
    i can still open my tacoma bed when fully flexed out..
     
  4. Mar 4, 2012 at 9:22 AM
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    KenLyns

    KenLyns [OP] Lord of War

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    I don't mind frame flex in a truck. However, the tailgate shouldn't buckle and get stuck at full flex. Our Tacos are reputed to have a flexible frame and weak tailgate, yet it isn't as bad as the Ford.

    The video you posted is biased in that Ford specifically picked the test surface to hit the resonance frequency of the Tundra's frame.

    The frame flex test isn't particularly biased. The ramps are there only to allow these non-offroad trucks to be diagonally supported, with two wheels in the air, which we encounter when wheeling.
     
  5. Mar 4, 2012 at 11:58 AM
    #5
    1980

    1980 Well-Known Member

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    I was down in the Big Bend, Texas area doing some research while in grad school when I got one front and one rear wheel off the ground on one of those old mining trails they have down there.

    I could have used my 06's locking differential then but my '87 didn't have one Fortunately, I had a high-lift jack and there were several rocks around that I could stack to get myself out of my predicament. I can't recall that the '87 Toyota pickup's frame flexed at all; however, it was more rigid than the newer frames.
     
  6. Mar 4, 2012 at 5:16 PM
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    Alderleet

    Alderleet Ace of Spades

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    Im gonna have to go flex my taco's frame like that and see if I can open the tailgate.

    I thought the box movement frame test was biased too. I was at a big vehicle expo and ford had their test area and trailer with videos and such. They had that same video playing. A ford dealer came up and said "that box rattle is pretty bad in the tundra" (trying to spark a conversation to start pitching/selling me shit)

    I asked him what the resonance frequency is of the F150. He said it didnt matter...

    I had to bite my lip from not laughing. I calmly told him resonance frequency is a vital characteristic of metal. I told him "go watch the video of the tacoma narrows bridge. That structure was reinforced thousands of times stronger than your prized truck, and its still managed to whip itself to pieces at the right frequency."
     
  7. Mar 4, 2012 at 7:46 PM
    #7
    KenLyns

    KenLyns [OP] Lord of War

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    If you get stuck in a precarious situation and need to access recovery equipment in the bed, it would be rather unfortunate if the tailgate can't open. :)
     
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