I want to quickly bring this thread up to date.
Before I go and do the whole Tub, Would doing the hard top make much of a difference on it's own? I feel like that's where most of the noise is coming from.
What should I use for most sound deadening and best cost for the hard top?
Would love to make the ride quieter inside the jeep. I don't know how anyone would do a solid road trip without making it quieter in there.
Also, how easy is this stuff to take off if ever you want to redo it or don't like it or anything? Does it peel off well or is it a total bitch to remove?
I would put sound deadener on parts of it. And cover that with some nicer indoor outdoor carpet. When I say sound deadener I mean this stuff or similar:
https://www.amazon.com/dp/B00URUIKAK/?tag=wranglerorg-20
That top is certainly resonating sound vibrations back at you. Killing those vibrations with sound deadener would be a must do. But I wouldn't use alot of it. You can kill the sound vibrations of a large portion of sheet metal with just a swath of it down the middle. Or a couple swaths. If you covered the top completely in sound deadener it would end up weighing to much. Way to much I think. The stuff is like heavy rubber. A box of it is hard to pick up.
I'd cover that with nice indoor/outdoor carpet. Or similar. That will cut down on alot of noise. And cover up the ugly look of the sound deadener.
You could also use this stuff over the sound deadener. It's heat barrier. If you live in a warm climate I'd highly suggest it. I'm using it over sound deadener on my tub. To stop some of the heat that comes up thru the floor. I would imagine a black hard top would generate similar heat in the sun. Likewise if you do your tub. I'd definitely put this down at least over the parts of the tub that reside over the engine, trans, and exhaust system.
http://www.carinsulation.com/buycarinsulation.html
Lastly. To answer your first question. I think sound deadening the top would make alot of sense. It's almost like a big cone or hat you're wearing that goes almost all the way around your head. Having it sound deadened and covered in carpet. Would certainly make your cab way quieter. But I wouldn't do it instead of your tub. I think both are in order. I think you'd get similar benefits from each.
And think about that heat shield. Even if you just did the very top of your top and the tunnel on the tub. It would help immensely.
PS - @Chris used an additional layer of thick closed cell foam over the sound deadener. This was on his last TJ that he owned. There's a nice set of pics of it. Maybe in this thread. I'll have to look. But he could tell you how much more sound deadening he got for laying that stuff down. It certainly looked impressive. It was like a sound blocking mat. That was very thick.
I found it. It's post #54 on page three. Here's a link to page three.
https://wranglertjforum.com/threads/how-to-sound-deaden-the-interior-of-your-tj.16153/page-3
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