This may seem overly simple but it tripped me up when I got mine. Is your back seat head unit turned on??? It turns off the back speakers when on so as to allow the back seat passenger to listen on head phones without interference. Turn it off and the speakers come back on.
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2004 Lux with 6 inch Fabtech with tie rods, 38 inch MT's, 4:88 gears, and some minor engine tweaks.
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