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Old 05-16-2004, 12:03 PM
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GMC chassis frame boxing

I'm busy installing Jaguar suspension into my GMC panel truck. Before starting with the rear I first need to box the frame. Where the frame goes over the rear axle the bottom of the frame is wider than the top. What do i do here? Do I cut it to the same width as the top or do I put the boxing plate on top of the bottom?

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Old 05-18-2004, 05:15 AM
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before you box the rear you have to welt the tabs for the jag suspension mounting (ill e-mail the drawings soon) but all you really have to do is weld in a plate that closes the u profile to a box... hence the name boxing..

if you are carefull and get good penetration and a weld bead thickness equal or greater than the material you can weld in the corners of the box so to speak, so plate can ce cut to follow the frame and all you have to do is weld it in 4-5 cm increments to avoid warping the frame

I opted to put some 1 inch stainless tubes inside the frame on my 32 roadster to run fuellines and brake-lines inside the frame, but i am running an open engine compartment and didnt want the wires to show...
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Old 05-18-2004, 09:16 AM
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Cut the frame to the same width so the boxing plates are square. The boxed shape will add so much strength, the extra flange width that GMC provided for that purpose won't be necessary any longer.
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Old 05-18-2004, 12:31 PM
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Cool

Thanks guys
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