Dynamat on transmission hump?

[ColReb1295]

took out my transmission hump and stripped the bottom side and was wondering if a dynamat could be put on it to insulate noise etc.

I do not like the spray rubberized undercoating crap...its messy and looks terrible in my opinion. Its the rubberized undercoating applied by the PO sprayed over 30 years of mud and grease I am taking off now.

 

[Poser]

took out my transmission hump and stripped the bottom side and was wondering if a dynamat could be put on it to insulate noise etc.

I do not like the spray rubberized undercoating crap...its messy and looks terrible in my opinion. Its the rubberized undercoating applied by the PO sprayed over 30 years of mud and grease I am taking off now.

If it is on the bottom side of the transmission hump, how are you able to see it while you are operating the vehicle?

 

[ColReb1295]

If it is on the bottom side of the transmission hump, how are you able to see it while you are operating the vehicle?

OCD...I know its there....lol


also, I think that stuff traps moisture in it and causes more rust than without and able to dry out completely. just my .02 cents

 

[grant5127]

Are you sure that dope is gonna stay stuck under there being that area is the hot zone........?

 

[middlecalf]

Are you sure that dope is gonna stay stuck under there being that area is the hot zone........?

Don't dynamats mount on the inside with "dope?"

 

[Bret]

I put heat shield underneath mine instead. It was a adhesive backed fiberglass mesh with aluminum facing. Did a good job of reducing the heat coming through the tunnel. I got mine from Summit.

 

[rlong]

Check out to Jegs and Summit online, theres all sorts O' Dynomat type products (even Jags generic) with all sorts of thickneses, including multiple layers with varying densities, and neoprene foam. You can also check out nice foam insulation with foil facing for marine engine compartments as well. Hell use both! Spray on and "dynamat" type material. A variety of densities helps with sound dampening.

Shshshshsh

Bob in CO

 

[Source3]

Read this from the 60's Forum:
https://forum.ih8mud.com/60-series-wagons/102872-sound-deadening.html

 

[brooklyn]

dynamat in the fj40

Here is a link to an install in my fj40

https://forum.ih8mud.com/40-55-series-tech/237724-dynamat-sound-deadening-completed.html

I currently have a small square under my truck to see how it holds up to the the elements. So far it is holding, but I wouldn't do the underside of the "hump." Don't know if it would hold up. I put a heat shield under my other fj40, but fastened it on with screws that are used to hold the hump in place.

In terms of moisture, I don't know how it will get under the dynamat as it creates a rubber membrane that would prevent water from getting to the metal.

 

[slickrock]

What about installing dynamat under the rig?

 

[bgray]

Looks great and I'll probably do the same, though I am curious as to whether it would trap moisture as noted. Also, how hard is it to remove if you needed to service the transmission? Does it peal back or does it become one with the floor over time?

By comparison, would you get similar improvement on the noise reduction if you installed two heavy floor mats?

 

[Combat Chuck]

Looks great and I'll probably do the same, though I am curious as to whether it would trap moisture as noted. Also, how hard is it to remove if you needed to service the transmission? Does it peal back or does it become one with the floor over time?

By comparison, would you get similar improvement on the noise reduction if you installed two heavy floor mats?

Pretty sure, given enough epoxy, and applied correctly, it should keep moisture out. If you section it right, so there's a seam along where the transmission hump cover meets the floorboards, it'll come apart when needed. I actually hoping to do Dynamat on top of and under my rig's floorboards as well, and I think it'll work.