Air Ride/ Lift Kits/ Lowering Kits Questions & Answers

12617 Views 7 Replies 5 Participants Last post by [email protected], Aug 20, 2015

c10

Discussion Starter · Dec 28, 2012

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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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406Rich

· #3 · Aug 4, 2014

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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lakeroadster

· #4 · Aug 4, 2014

Frame Notch Based On Strength

mt94ss said:
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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mt94ss

· #5 · Aug 13, 2014

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...

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lakeroadster

· #6 · Aug 14, 2014

mt94ss said:
....... 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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mt94ss

· #7 · Aug 26, 2014

lakeroadster said:
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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[email protected]

· #8 · Aug 20, 2015 (Edited)

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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