Covering the inner door skins on the rear doors with about 85% coverage or so with that butyl sound deadner insulation material made a dramatic difference. Will definitely be using it again in future projects. Greatly reduces the sheet metal rattling common with GMs. I was pounding on them fairly firmly with a closed fist. Only took about an hour to cover the 4 doors I have done thus far. Front doors will get the same treatment. I will use the same material on the 97 when I swap out the speakers in the front and rear doors in the future.
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