Firewall and sound deadening material - Ford Powerstroke Diesel Forum
99-03 7.3L Exterior Discussion Body and Accessories Talk

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post #1 of 18 Old 11-18-2009, 09:25 PM Thread Starter
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Question Firewall and sound deadening material

Hi guys, I have a 2000 f-350 cclb lariet and it's extremely loud in-cab. I put in:Ford AIS intake, 4" exhaust, fpr shim, 10k mod, and it's
unbearable over 2000 rpms. Started looking around I don't have any sound deadening material behind the firewall. What is the easiest way to get this back in, other suggestions???

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post #2 of 18 Old 11-19-2009, 11:54 AM
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You have a few options. Ordered by dificulty and cost.

Pull motor and apply sound deadening material to firewall.

Pull dash and apply sound deadening material to firewall.

Install loud sound system.

Install ear plugs.



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post #3 of 18 Old 11-19-2009, 12:43 PM
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lol all of those are awesome ideas...you could always just do the dash tear down and put down some fat mat...or can't remember the name of the other one??????....ummm...damn I can't think of it. while you're at it, just tear out the whole interior and sound deaden the whole thing, and when you do your stereo system( AWESOME UPGRADE ) it won't be annoying when things start to rattle....but that actually is the easiest thing tht comes to mind right now.

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post #4 of 18 Old 11-19-2009, 12:47 PM
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try using DYNAMAT! that is what Chip Foose uses on all the cars he restores and builds and that stuff is great!

Nick

96 F250 Ex Cab LB, Afe Intake, 3" DP to 4" to 5", no kitty,no muff, dual 8" stacks, 6 pos chip, leveling kit, gauges, E4OD w/ shift enhancer, 285/75/16 Toyo M/T's

Soon to come: Turbo, intercooler, Stage 1's, big oil sys., gear vendor over/under to get the mpg's up and to go with the new trans, STACKS ARE ON! ( luckily my brother is a master diesel mechanic- if he can't fix it, it ain't broke)

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post #5 of 18 Old 11-19-2009, 12:49 PM
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THANK YOU!!! THAT'S WHAT IT'S CALLED!!!!! there's also the cheaper fat mat, but the dynamat is the best, I did my old s10 cab in dynamat worked awesome.

Chad
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post #6 of 18 Old 11-19-2009, 01:35 PM Thread Starter
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I figured going out and getting two or three sound deadening mats out of the salvage yard would work.
Getting them in looks like a PITA. How hard is it to tear the dash apart?? Right now the radio is at 60% just to hear it!

BTW, Thanks for the quick replies!!!!

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post #7 of 18 Old 11-19-2009, 02:03 PM
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I would look into your exhaust connections...my 4" exhaust was not that loud at all....Im running a full 5" turbo back now and the wife says it's QUIETER than my 4" exhaust and I have a monster tip with the 5".....I would check those, sounds like somethings not right.

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post #8 of 18 Old 11-19-2009, 05:52 PM
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I forgot about it earlier, but the Excursions have a panel that goes on under the dash and cuts some noise. TDS has an article on it.

As for the Dynamat, I did my entire cab and inside and outside of the doors. It helps a lot with the road noise and rattles, but until I get an excuse to pull the dash and/or motor, the 7.3 is still quite noticeable.


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post #9 of 18 Old 11-21-2009, 04:44 PM Thread Starter
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Thanks for the info,was at the salvage yard yesterday and picked up some excursion sound stuffing for temp., till I get dynomat. IDK about the exhaust as it is all froze up on the underside, and I don't want to work in the Big Sky Garage "Frozen Ground Outside". Will do that when it warms up though.
Mine is a hand shaker, not a slush box, so the excursion panel didn't work but it could be modified.
THANKS AGAIN !!
Wilkie B
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post #10 of 18 Old 11-21-2009, 10:51 PM
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This is what I have ordered, I have enough to do the whole cab (100ft^2) for about 170 bucks... He has a killer sale right now...

RAAMaudio

2001 - 14" OUO 525 - 38x15.5x20 Toyo & 20x12 Weld Cheyenne's. Hybrids, 38R, BTS, Spearco, Terminators..


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You will get some axle wrap with a heavy trailer, I can feel it when towing my gooseneck with some heavy equipment. My Deavers will wrap enough to make the tires rub the front of the rear fender well if I give it too much throttle on aceleration.
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