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Probably line the door or even the door panel,
The only thing is, these trucks are 80s design,windnoise and road noise were
not even a design consideration.
The WHOLE truck needs work to cut down any type of noise.
Dynamat the whole truck is something to consider.
Doing the doors IS a great start. Something I may consider.
I will be covering much of the floor, firewall and door panels of my '78 with that dynamat stuff. I guess it can be sprayed on also? It's pretty expensive stuff though.
I will be replacing my 1996 XLT carpet with a brand new black rubber mat
( just received from Jeffʻs Bronco Graveyard today)(big deal you say, check out my location) It is a big deal.
Anyway, I may do some insulating too, since the carpet is being removed.
And this stuff is not cheap.
You guys may consider checking out a carpeting store for your matting and pads. If you're any good at trimming your own, you can get varying sizes and thicknesses of carpet padding that will significantly decrease the noise inside your ride.
Also, without starting controversy, I used Peel n Seal that I got from Lowes to place in the rear area of my Bronco under the rubber matting and t did decrease the noise pretty well. I also plan to pad the interior when I get the time and finances allow for it. My Bronco's a 92 Custom 6cyl. The only factory option it came with was A/C when my FIL ordered it.
I bought this rubber-foam type stuff from Menards.. they're meant as outdoor runners.. but I cut it to shape and glued it to every interior panel, including the floor in my Bronco. It cuts down on vibration almost as well as dynamat, but adds a TON of sound insulation.
I just used 3M trim glue (only kind that worked), it's sticking well. Interior of the door and the bed floor made the biggest difference. You want it between the glass and the outside panel of the door, you can cover it all with 2 or 3 big pieces.
I even put some under my hood, made the engine completely silent but the cheap glue failed, gonna redo it with some 3M trim glue later.
for sound insulation (not just vibration dampening) it kicks dynamat's rear. Undercarriage paint (which can be found cheap) does fine as a vibration dampener as well.
keep in mind, the thin sticky dynamat isn't meant for sound insulation, just vibration dampening (the vibration can make outside noises sound louder though)
McMaster-Carr sells all sorts of stuff for this purpose. I insulated the inner panels with 1" adhesive-backed foam that worked perfectly. Doesn't weigh near what Dynamat does, is easily trimmed and compressed to fit tight spaces, and expands to fill them. Since it is foam, it can be slit to run wires through without leaving holes for air to get through. Widths from 1/2" to 5' 0" and unlimited lengths. I bought 36"x 25' 0" and still have plenty left to do other projects.