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ON Blazers, the first gap to go after is the rear of the door to the front of the quarter panel. This needs to be perfectly parallel while having the leading edge of the door quarter window frame aligned to the windshield frame. This is all best done with a hardtop in place as this will hold the windshield frame/firewall solid. Everything else is easily adjusted (fender, rocker panel, etc.). The front of the rear quarter and the outer rocker are at right angles but if off, that's were the shimming of the body. The GM assembly manual refers to shims under the front two tub mody mounts. Easiest way to to slot some large washers and use them to adjust the flex of the body depending on the alignment problem.
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