[c10]

Air Ride/ Lift Kits/ Lowering Kits Questions & Answers

 

[mt94ss]

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

 

[406Rich]

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

 

[lakeroadster]

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

 

[mt94ss]

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...

 

[lakeroadster]

....... 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

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Tube Type Step Notch as viewed from inside

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[mt94ss]

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.