Originally Posted by Ott3r
I'm surprised nobody has mentioned mass loaded vinyl.
According to some, it is way more effective than dampener sheets.

Unfortunately these guys are out of business, but their website still has a great discussion & comparison of the different sound deadening strategies

https://www.sounddeadenershowdown.com/products


Mass loaded vinyl is what I want someday... it would be interesting to hear if anyone here has tried it?

Not MLV, but several years ago several folks in the Dodge diesel world were using sheet lead to line the floor and firewall and covering it with peel and stick from the big box stores. Sheet lead is rated at lbs per sq. foot and with a Dodge Cummins truck that bit of extra weight is pretty insufficient. As I recall the results were very good at quieting the Cummins. I suspect it'd work well in our trucks in the floor and on the firewall with the same peel and stick on top.

RonR

RonR


1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1964 CJ5