DIY Dynamat sound deadening your 4WD
18th Apr 2025 | 5 minutes to read
If you’re tired of road noise, rattles, and excessive heat in your 4WD, Dynamat might just be the upgrade you’ve been looking for. This guide will walk you through the process of sound deadening your vehicle’s cabin at home using Dynamat, a trusted product for reducing noise and heat. From removing the interior components to properly applying the sound-deadening material, we’ll cover everything you need to know to achieve professional results.
Check out the amazing results from our Dynamat installation below:
Whether you’re tackling a budget build or upgrading an iconic 4WD like Shauno’s Sooty MK2, Dynamat can transform your driving experience by creating a quieter, cooler, and more comfortable cabin. Let’s dive into the step-by-step process and see how Dynamat can make a difference!
Cleaning Your Vehicle
Jocko first tackles this DIY Dynamat sound deadening project by removing the interior of the 4WD. This involves taking out the seats, removing the center console, and pulling up the carpet.
Because of the state of the interior of this vehicle, we made sure to give the bare interior a thorough clean and a good vacuum.
The best results from Dynamat come from ensuring at least the key areas are covered with the product, such as the firewall and the footwell. If you have enough Dynamat, you can even apply the matting behind the panels of your doors and on the roof of your 4WD.
Take Your Time
Make sure you take your time putting the Dynamat down, ensuring it is properly stuck to the surface.
Avoid covering things such as grommets in the floor (used for letting out water), and don’t cover any mounting holes for seats or any wiring.
If Dynamat is installed properly, using tools like the Dynamat Roller to ensure no air is trapped between the floor and the matting, and Dynamat Finishing Tape to seal edges and gaps, you can guarantee no water will get trapped in your 4WD.
Simple Installation
We cut sections of Dynamat to size to fit the areas we wanted to cover. We used the Dynamat Roller to press down every part of the sound deadener we applied and sealed off all the edges of the matting with Dynamat Tape.
Heat Reduction and Sound Deadening
Not only does Dynamat reduce sound coming into the cabin, but it is also highly effective at reducing the amount of heat entering the vehicle. For example, in the GU Patrol featured in this video, the dump pipe is located right behind the firewall, and the exhaust runs underneath the passenger footwell.
Over time, certain sections of the vehicle (especially on long trips and in modified 4WDs) can become quite hot. Dynamat helps keep out the high temperatures, making for more comfortable trips.
Decibel Tested
Before this build, we measured the decibel output of driving a stock dual cab 79 Series Toyota LandCruiser. After installing Dynamat, the results were remarkable!
Dynamat Sound Deadening in Sooty MK2
Just like this budget GU, Shauno chose to upgrade the noise and heat reduction capabilities in the rebuild of his iconic 80 Series LandCruiser, Sooty.
While the dash was removed during the rebuilding process, Shauno felt it was the perfect opportunity to completely cover the interior of his new 80 Series in Dynamat — something he always wished he had done in the original Sooty.
