Re: Crewcab roof sound deadening?
Just use 3M HD headliner adhesive and cut a section of 3/8" jute backing and glue it to the topside of the headliner(s). Then use 3M rubberized undercoating on the interior roof skin-after it all cures for a few days go ahead and install-itll be extremely quiet compared to not doing it. I did this in a Suburban for better stereo sound control and it made a HUGE difference. As a side effect the AC was much colder inside too since the hot sun wasnt able to radiate heat through the roof anymore.
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