My 40, probably a lot like your 40, is loud any time it's moving; is hot when it's hot outside; is cold when it's cold outside. I've got plenty of "aftermarket ventilation" which isn't helping anything, but this post isn't about rust repair. For those of you who have used insulating material (dynamat, noico, etc.), where did you get the most improvement?
I don't currently have a headliner, and I wonder how much noise would be reduced by putting insulation up there? Are the doors and sides a greater source of noise than the floors? I generally get quite a lot of heat from the firewall/transmission tunnel, so it feels like that would be a good place to insulate as well.
These materials are pricey, so I'd like to spend my money as efficiently as possible. So, what worked best for you? What didn't seem to make a difference? What did you learn in the process that you wished you'd known at the beginning?
I don't currently have a headliner, and I wonder how much noise would be reduced by putting insulation up there? Are the doors and sides a greater source of noise than the floors? I generally get quite a lot of heat from the firewall/transmission tunnel, so it feels like that would be a good place to insulate as well.
These materials are pricey, so I'd like to spend my money as efficiently as possible. So, what worked best for you? What didn't seem to make a difference? What did you learn in the process that you wished you'd known at the beginning?