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Old 06-08-2011, 08:17 AM
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C'ing frame - dangerous????

I read a couple of articles that indicate C'ing the frame at the rear axle is dangerous because it weakens the frame in that area. Is this a fact? I was thinking of doing because the rear axle has to much movement and hits the frame when I go over a bump or hit any type of hole in the road. I was thinking I would box in the rear area after putting the C's in but now I am not sure what to do. In a light 32 3wdw like I have I wouldn't think that the C'd section would be that weak that I would have to worry about it bending or breaking. Any thoughts?????

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Old 06-08-2011, 08:36 AM
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Quote:
Originally Posted by reflog
I read a couple of articles that indicate C'ing the frame at the rear axle is dangerous because it weakens the frame in that area. Is this a fact?
Any radical change in the shape of the frame rails is a stress concentration, so yes, all else being equal, C'ing the frame will introduce a potential weakness. Now, strength can be restored by throwing metal at the problem (boxing plates, stiffeners, etc). It's certainly possible to do this right, but it's also possible to do it wrong.
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Old 06-08-2011, 10:33 AM
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Old 06-08-2011, 10:44 AM
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A stock frame (truck, right?) is made for hauling loads. A half ton is rated to haul a load. A notched frame just needs to hold its own weight as well as body with strength for safety. If you were to C it and still want to tow a mobile home, you can see the potential for troubles. If done properly and used in the cruiser manner intended I can't see it being a problem at all. So, even if it's weakened, consider what it'll be used for and don't worry about it. It just won't be a work horse anymore.
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Old 06-08-2011, 11:17 AM
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This is a stock, original 32 frame ( minus the cross members )



And here is the same frame boxed and with a " C " section



You KNOW that the frame ( boxed ) with the " C " section is considerably stronger than the original flimsy frame

Because you are doing some work on a 32 chassis, you might find my 32 project journal interesting.
Go here http://www.hotrodders.com/forum/jour...ge=1&reverse=1
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Old 06-08-2011, 11:46 AM
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If you're running parallel leaf springs to suspend your rear axle, you need to make sure the C-notch is boxed and strengthened adequately to avoid folding up the frame. If you're running coils/coil-over shocks mounted fore of the C-notch (in front of the axle), the issue isn't nearly as great since the frame will load up ahead of the C notch.
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Old 06-08-2011, 12:26 PM
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If you are at all concerned, then just make up 10ga or so doubler plates to weld to the inside of the frame along the boxing plates. Extend them a couple of inches beyond the 'C', each side. I would also, again only if worried about strength, drill some half inch holes and weld through them as well as the perimeter. It's overkill, but................
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