2nd Gen Non-Engine/Transmission how to reduce interior noise???

[JMauro]

i'm sure a lot of guys like it but the engine noise in my truck is more than i care to hear for any length of time. i know the 12's are louder than the newer engines but i sure would like to get it bearable in the cab. the exhaust is a little louder than stock but it's the engine that gets me. this is a stripper with rubber mat ect. but it looks like it has a fair amount of insulation from the factory although the rear wall of the cab is bare. i was thinking about getting some of the sound deadening material they sell (man most of it's pricey) and start there but i don't know how much this problem can be improved on. was also thinking about pulling the seat and floor mat out to see if i can add any additional there. doesn't look like you could really add much if any in the engine compartment without major hassle. anybody have some helpful pointers here?



thanks.

 

[jandtjil]

If you do a search you will most likely find that there is no one cure.

oil pan and valve cover insulation

hood blanket or undercoating

layers of foam or undercoating to the underside or interior and doors

exhaust wrap

Personally i think a great deal comes through the firewall, havent attacked the area behind the dash yet. Maybe one of these days.

JJ

 

[Gene Arnold]

Pilotman posted this in the Third Generation Section:



Wanted to post this for everyone that would love to have there truck as quiet as a lexus with out having to spend $3000 big ones to have someone at a stereo shop do it half ***. I found this stuff called Jiffy Seal at Lowes Hardware for $16. 00 per 50' x 6" role that is used for sealing the edge of windows in construction. It is made of a tar compound that has adhesive on both sides. I compared it to a popular sound deadening material called HushMatt. It was very close in thickness and was just as sticky. The difference was that the Hushmatt has one side that was foil painted black and cost about 300 times as much. I had my wife while on a weekly market trip pick me up the heaviest duty role of tin foil she could find. After pealing the first piece and adhering it to the tin foil and trimming a bit I found that I had made the same exact stuff as the HushMatt for the most part. A Hell of a lot cheaper.



I started with the inside of the doors and worked my way to sealing all the interior surfaces of the doors and the holes that they leave open from the factory. There is a source of a bunch if noise right there. If you tap on the exterior of the door before the matt is put on it sounds like a drum. The difference is astounding.



I took it for a test drive and found that the doors sounded great but I could hear a source of more noise in the back seat. After taking all the back seats and hardware out I saw what equated to a large drum back there. I covered the entire rear cab facing the bed and then pulled out the floor matting under the seats to find the same issue. The carpet is pretty good at killing the sound due to its foal underlayment but this stuff was 1/8" thick of nothing.



One really bad source of noise was the cabin pressure vents behind the rear seats. I did seal those up but I am not reconsidering opening one of them up due to the high cabin pressure when the A/C is on even the low setting. On high I felt like I was in an airline with pressurization problems. Figure I could always get in the truck if a have a diving accident and need a pressure vessel .



Maybe it has possibilities for you.

 

[24V-DSL]

TDR member, Lsfarm, has done enough with this to call himself The Noise Nazi.



Might want to check out his old posts.

 

[Cummins Thunder]

I removed my whole interior (minus the dash) and coated my whole cab with DynaMat Extreme... . What a difference! It is not totaly quiet but it is much more bearable. Friends and family have noticed the change, and said it is much better.



I will try to post a couple of pics of my install for you.

 

[Cowboy Medic]

Just today I did something that significantly dropped the noise in my cab. I pulled off the cup holder from around my manual transmission and wrapped the shift tower with some foam rubber and then wrapped that with duct tape. This is the part covered by the second rubber cover underneath the cosmetic one. Made sure everything still moved freely and put it all back together. I would honestly say this eliminated the number one source of noise in my truck.



I plan to do the floor under the carpet and the back wall, and possibly the doors later this summer. I like the solution Gene Arnold posted about and am planning to try that. Although right now I must say I am pretty thrilled with what my experiment today got me.

 

[McCRam]

Get a purse.

When my wife has her purse on my transmission hump, it blocks quite a bit of noise. It makes a big difference when she picks it up. I think that a lot of noise gets transmitted through the transmission, it makes its own gear noise on top of the rest. Like cowbot medic, this is going to be the first area I tackle.