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Frame And Crossmember

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CJ-3A and -3B frames eliminated the earlier gussetted bumper design and had the frame horns enlarged to fit the standard bumper. The round crossmember was retained, but the grille of the 2A and 3A doesn't bolt to it in the center. Boxing of the frame is limited to areas behind the crossmember, but savvy owners usually add some reinforcement up front to prevent damage. The later M38 frame was gusseted in this area and proved much more substantial.