Ok, here is what I would do if I were you. Eleminate every thing that could cause such a noise. Pull everything back off and take off the backing plate. Reinstall everything. If you have no more noise, then you have just found your problem. Its just a process of elemination. If it still makes noise, pull off something else.
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94 Chevy Silverado Ext cab 4/6 drop w/ 18's and 2500watt system (work truck). 67 Chevy swb under const. frame off custom, 20's, bagged and a large rat under the hood,and a 1940 Chevy truck under const.
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