If it was a Cadillac it already would have had these materials in it and would require no effort. I don't see the problem with trying to squelch some of the noise. I get your point that it's a noisy vehicle and you shouldn't expect it to be as quiet as a Caddy, but that doesn't mean it can't be improved, or isn't worth improving. Especially if you spend hours a day in it on the highway.

 

You could put some closed cell foam between the panels and where they mount, its not super cheap either tho.

 

My point is your going through all this time, money, and effort for a very minimal return.

The wind noise alone is terrible. After all, were discussing a refrigerator box on wheels.

Just turn up the radio more.

 

lol. I hear you. But I think you're underestimating what can be done.

I'd venture to say that a layer of closed cell foam and mass loaded vinyl on the floor/firewall would have a pretty drastic effect. Hell, you can probably source some of these materials at a JY out of higher end vehicles.

 

You'll need to track down all your noises to see where they are coming from exactly and repair them one by one. You can get your Jeep super quiet. I've done it on mine. Don't worry about the MPG's. You won't loose vey much dropping the tire pressure 3 or 4 psi. You don't want to go real low just enough for the tires to absorb more of the road so the dash doesn't have to. My center radio/AC control bezel cracked everytime I hit a bump. There are rubber stoppers that dry out since they Jeeps are old now and rub against the plastic on the inside. I've taken them out and added small pieces of foam insulation behind the bezel to reduce the noises. Lowering the PSI eliminated it totally. If the Jeep is hitting bumps hard and you already have better shocks, you could look in to BPE's. They help with impact as well. FYI Nitro shocks ride better than Hydro shocks. Atleast in my case. I'm sure someone will argue that. Do you still have your carpets in? Removing them will increase road noise greatly. You could get extra padding for underneath the stock carpet to deaden the sound. Just make sure it's heat rated and won't give off any toxic fumes if heated by the temps of the floor boards. Also, Antiseize is your friend. Make sure to coat both sides of all rubber bushings on the leaf springs, shackels and control arms. I even do my trackbar bushing. I keep everything quiet. As far as road noise, there is almost no getting around having some road noise with oversized/all terrain or mud tires. If I could get my lockers to not make the ratcheting sound while turning, nobody would know I was coming around the corners either. The engine noise you hear is most likely your fan clutch. Rip that baby out and put in an electric fan. School bus noise is now gone.

 

Lol my radio is always up to drown out the noises my Jeep makes. Wind noise is the least of my problems, I can't even hear that in comparison to everything else.

 

I've tightened up a lot of stuff in hopes of fixing all the noises but everything is still pretty loud. My carpet is still in and I have heavy rubber floor mats on top of it. I keep all my bushings and joints well greased. I'll probably go buy some closed cell foam to put under the carpet and see if it gets rid of some road noise. The fan clutch isn't as loud or noticible as my exhaust, so im not too worried about it haha.

My question now is, where is a good place to buy closed cell foam for a good price?

 

Just closed cell foam isn't going to get you very good results, you need to use the MLV in combination with it. I really recommend reading up on the principles on SoundDeadenerShowdown.com if you haven't already. As I said, Don knows what he's talking about and he presents a really easy 1-2-3 type approach to silencing your vehicle. The whole site is written out like a How-to, and there's no reason you can't use his approach using other materials. The important part is the concept he presents, because it works.

 

I have no experience with cell foam since I've had no need for it. So I'm sorry, I cannot help you there.

As far as the other sounds go, did you pinpoint where all your noises are coming from? You mentioned exhaust being loud. Is it leaking or is it an aftermarket muffler? If it's leaking obviously fix the leaks to quiet it up. I'm not sure where you are getting wind noise from unless your window seals are leaking. I basically tracked down all my noises one by one and took care of them. It took me quite a few tries but I got them. I even took steel wool to eliminate the annoying pop from the door checks. Like I said, I don't like noises so I will try to help you out anyway I can.

 

Yeah, I have the infamous dash squeak/rattle, just some road noise resonating through the floors and unibody, and that's really all I can pinpoint.
I'm running a flowmaster 40, so theres really nothing I can do about the exhaust noise lol.

My window seals are pretty bad along with my door seals. Im getting new front doors to solve the problem there.

Thanks for all the help man I appreciate it.

 

The upscale models have an engine bay sound deadening material attached to the hood. It helps.

 

I'm gonna look into either getting that from another XJ, or I may dynamat the inner of the hood. It'll deflect some heat too!

 

http://www.teamgrandwagoneer.com/cgi...=hood&catid=95

Teamcherokee.com carries the under hood insulation. It works pretty well. I installed it on my '99... Make sure you order the mounting clips too.

 

Just to chime in, I packed over 80 sq ft of fiberglass insulation ($9 for the giant roll) into every nook and cranny of the unibody and doors from the inside, along with another layer under the carpet, on top of the silver bubble wrap type insulation (Lowe's) which I covered the floor boards and tunnel with. It was fun getting the carpet back in and the interior plastics back on, but now everything is very tight...absolutely no rattles, and road noise is gone. It feels like a completely different vehicle, hitting bumps now there is simply a "thud", so solid. Another great perk is how easy it is to control the interior temp now.

 

You don't plan on offroading with the vehicle do you? If you stuffed the unibody (frame rails) with insulation and you go through water, it's gonna sit in there and accelerate rust to form.