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strapping in running a piece of "strap" metal stitch welded along the bottom and sometimes along the top, usually the same thickness as the frame,  This turns the frame from a C-channel into more of a I-beam.  The thicker bottom/top allow the frame to flex but also help stop them from cracking out, as older CJ frame like to do.


Think of it as trussing an axle housings, except to the frame.


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