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Air-bagging my '59 GMC

Anyone have any tips on notching the frame for clearance of the rear axle? I am looking into 'C' notching the frame and want it strong. Probably gong to triangulated 4-link since the rear is already set up for it.

Thanks!

Mike
 

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Porter built c- notch seems to be the strongest at the moment, might want to look at they`re`s and copy it...!
 

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Frame Notch Based On Strength

Anyone have any tips on notching the frame for clearance of the rear axle? I am looking into 'C' notching the frame and want it strong. Probably gong to triangulated 4-link since the rear is already set up for it.

Thanks!

Mike
Mike,

I ran some numbers a couple years back on frame notching designs and summed them up in a thread. Here's a link for ya: Frame Notch Based On Strength

Hope that helps.

John
 

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John, that is exactly what I was looking for. Looks like the last one is the one that makes the most sense.


I want to keep the stock bed floor. So if I kept the upper piece about 1/4" below the bed floor rails does that mean that I can only go up about 1 1/2" +/-? Should the upper support be the same thickness as the notch is my question?

I think I have seen your stress images elsewhere. Nice software.

Mike

p.s.
I was on vacation so I didn't get right back to this thread... :D
 

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....... I want to keep the stock bed floor. So if I kept the upper piece about 1/4" below the bed floor rails does that mean that I can only go up about 1 1/2" +/-? Should the upper support be the same thickness as the notch is my question?

I think I have seen your stress images elsewhere. Nice software.

Mike
Mike, 1-1/2" +/-.. yeah that sounds about right. I'll re-post the section of my thread here, for clarification of tubing size and thickness.

Step Notch made from rectangular tube. Here is one I developed that is made from mitered 3-1/2" x 2-1/2" x 1/4" wall tubing. It is about 10% stronger than a stock frame and gains you about 3-1/2" additional clearance.

Tube Type Step Notch FEA



Tube Type Step Notch as viewed from inside
 

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Mike, 1-1/2" +/-.. yeah that sounds about right. I'll re-post the section of my thread here, for clarification of tubing size and thickness.

Step Notch made from rectangular tube. Here is one I developed that is made from mitered 3-1/2" x 2-1/2" x 1/4" wall tubing. It is about 10% stronger than a stock frame and gains you about 3-1/2" additional clearance.

Tube Type Step Notch FEA

Tube Type Step Notch as viewed from inside

Were you going to post the measurements of the pieces and the angles? It would be much easier to make them. I can guess but the actual measurements would be easier.

Thanks,
Mike
 

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I know this is an older post, but wanted to add to it for the guys doing their own notches. Keep the Hog Head in mind. A lot of times it will determine how deep you can go with the notch especially if you are not wanting to modify the bed floor.
 
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