Sound Deadening Doors, Floors and Rear Hatch on 5th Gen 4Runner – Step by Step Install

 In 5th Gen Mods, DIY, Install

Sound Deadening Tools

Sound Deadening the Doors, Floors and Rear Hatch on the 5th Gen 4Runner – Step by Step Install

Application of CLD (Constrained Layer Damper) is fairly simple once you get the hang of it.

Working with the material is easy as long as you have the patience to measure, mark, cut and apply where it’s needed.

There are a couple of ways you can approach your installation. You can apply the CLD material over every square inch or you can apply it over the large open spaces on your sheet metal only and leave uncovered gaps throughout.

With covering every square inch, you are ensuring that you are eliminating as much sound vibration as possible. And, although a minimal application might not stop every sound wave, it sure will help keep the noise levels down.

Regardless of which you choose (full or minimal application), the benefits of sound deadening the 4Runner will be very rewarding. In that article, we cover different types of materials including CLD, MLV, and Closed Cell Foam. We also covered what you can expect from deadening each area of the 4Runner.

Minimal or Full application:

  1. Money
  2. Time/Patience/Energy

Money

For about 75 sq ft of CLD, you are looking at $100. For an entire 4Runner application, you need about 150sq ft of material. That would cover the doors, floors, pillars, hatch, and roof, so about $200. If you are looking to do just the doors, floors, and hatch (not the sides or roof) like I did, then you can get away with around 125 sq ft, so expect $150. I did not measure the exact amount of sheets used so don’t put a hard quote on me for this.

Time/Patience/Energy

This is not a fast application by any means. If you are looking for something quick and dirty, you can cover the wide open sheet metal only. That would be much faster than cutting, marking, measuring and applying hundreds of little pieces throughout the 4Runner.

There are applications around the web that show CLD over the exposed wiring harness. I choose to apply the material underneath the harness, which did take much more time, energy and patience.

I am not saying my way is 100% perfect at all. Maybe I put too much sound deadening on, and possibly an expert audio guy can comment here to let me know how I did.

At the end of the day, I cut noise by 50% so I think I did pretty well. I would like to apply a minimal amount of CLD to our other 4Runner and see if there is a noticeable difference.

Tools & Time for Installation

Sound Deadening Tools

You only need a few basic tools for the installation. Plastic pry tools, metric sockets, utility knife (razor blade), and a portable table with a cardboard base is about all you need. There are other tools that are recommended for the install but you don’t “need” everything. The staple gun will come in handy if your carpet stables get removed.

Material for install

Update: Recently MAT 66 was out of stock, Kilmat is the same product.

Tools for install

  • Plastic pry tools: Check Price
  • Mini-pry tools
  • Metric sockets
  • Staple Gun: Check Price
  • Drill
  • Utility knife (razor blade): Check Price
  • Portable table
  • Piece of cardboard for slicing on
  • Hole punch/screwdriver
  • Sound Deadening Tool: Check Price

Time for install:

  • Doors: 1/hr per door
  • Floors: 6/hr total
  • Hatch: 1/hr total

This entire process from start to finish can be done in a weekend, or even a day if you are feeling up for it. I would dedicate two days for the deadening application, especially if you haven’t pulled out the seats or door panels off yet. It’s not that complex, it just helps if you’ve done it once or twice.

Sound Deadening Doors

Remove covers and screws holding door panel in place

There are three tabs covering screw locations. Remove these three-panel covers and you will see a Phillips head screw that needs to be removed. There is one plastic cover that is very small. You should use a mini flat head screwdriver or a mini plastic trim tool here. Using a larger trim tool can damage the cover.

Remove A-Pillar Cap

Pop the A-Pillar cap off of the door using your hands. It can be removed from the outside edge.

Remove Door Cover & Courtesy Light Clip

Grab the bottom corner of the door panel and pull straight out. You will hear a few pops from the tabs being released. Proceed to unclip the courtesy light from the door panel.

Tape Door and Create a Guide for Applying the CLD

Tape Door

It’s a good idea to tape the border of the door all the way around. This will prevent you from over-applying an excess of CLD material.

Remove Door Cover, Disconnect Cables & Pull off Plastic Cover

Remove plastic cover and disconnect cables

Remove the door cover and carefully disconnect the cables attached to the door. The cables do come off easily, they just pop right out of their socket. You can also remove and discard the factory sound deadening plastic cover.

Remember to reattach the push tabs stuck to the door back onto the door panel.

Measure, Mark and Cut the CLD

Measure, Mark and Cut for Deadening

Hold up material to the door. Measure, mark and cut pieces according to where you plan on placing the sheets. For the wiring harnesses, I made a cut along the wires line and then folded the CLD around and under the wire harness. For clips, screw holes and other holes, I just marked a hole and then made a cut for that hole.

Place Sound Deadening on Sheet Metal

Place Sound Deadening on Sheet Metal

Next, peel back the CLD backing and apply the material. Using a plastic pry tool or a preferred sound deadening roller, flatten the material on the sheet metal. Looking back, I should have purchased the roller. Using the trim tools to flatten the material was not the best tool for the job. But it did work if you have nothing else.

Remove Styrofoam Sound Deadener

Remove Styrofoam Sound Deadener

In order to lay down CLD on the inside of the door, it will help if this styrofoam block is out.

Sound Deaden Inside of Doors

Sound Deaden Inside of Doors

How to Apply Sound Deadening Inside Doors

Applying Material Inside Doors

To get the CLD on the inside of the doors, it helped to slightly peel the backing first. Once you have a few inches of the sticky side exposed, place it as far inside the door as possible. After a small portion of the sticky side has been applied (holding position), peel back the remaining portion of backing and apply the remaining CLD.

Reinstall the Factory Sound Deadening Block

Sound Deadening Applied Inside Doors

After the inside of the door has been covered, you can reinstall the factory sound deadener.

Be aware of Bolt Holes and Tab Holes

Measure, Mark and Cut for Holes

Be cautious about every hole in the door. You can always go back and cut holes into the CLD once it’s applied but you risk leaving marks in the sheet metal. And, it’s just easier to plan for it the first time.

Cut Out Speaker Area & Apply the Dead

Cut Out Speaker Area & Apply the Dead

I found that instead of placing small pieces of CLD around the speaker area, covering it with one whole sheet and then cutting out a hole was a lot easier.

Apply CLD Sheets over Large Open Area

Apply CLD Sheets over Open Area

After most of the door has been covered, you can place larger sheets of CLD over the large exposed opening.

Cut Hole in CLD Sheet for Door Cables

Cut Hole in CLD Sheet for Door Cables

The last sheet you need to apply will fit the door cables. I cut a large opening and then left a layer of backing on the opposite side so the cables wouldn’t “stick” to the backside.

Remove Tape and Attach Door Panel over Door

Re-Attach Door Panel to Door

Remove the guide tape and then reinstall your door cover.

For the rear doors, the reinstall process might be a little challenging unless you remove a wiring harness clip first. Remove this piece holding the harness in place, then attach the door and then reconnect the harness clip.

Sound Deadening Floors

Remove Cargo Tray Cover

Remove Cargo Slide Tray

Using a plastic trim tool, pop the rear cargo tray cover. Then disassemble the rear cargo tray slide bracket.

Remove Cargo Compartment Tray Brackets

Remove Cargo Compartment Tray

The cargo tray compartment is held in place by these two bolts and then two more underneath along the sheet metal.

Remove Cargo Compartment Tray

Remove Cargo Compartment Tray

Once the top and bottom bolts are removed, you can remove the compartment.

Remove Slide Rails and Carpet

Remove Slide Rails and Carpet

After the cargo slide tray bracket is out, you can remove the carpet and then access to the bottom floor sheet metal.

Remove Rear Seats

Remove Rear Seats

The rear seats are held in place by a collection of bolts from the underside and the backside. The backside bolts are easy to access with a small ratchet. The front bolts are best accessed with an extension.

Rear Seats – Rear Cover

Rear Seats - Rear Cover

In order to actually remove the seats, you need to access the bolts holding the seats on their bracket. This bracket allows the seat to rotate back and forth. These bolts are accessed by lifting the rear seat cover. Lift this cover (held in place by push clip) up and you will access the bolt attached to the bracket.

After you remove the rear back seats, you can remove the lower bench seats as well. The bench seats are easy, just uncover the bolt caps and remove the seats.

Remove Kick Panels and Plastic Seat Caps

Remove Kick Panels and Plastic Seat Caps

Using pry tools, you can lift the plastic kick panels and the seat plastics.

Remove B-Pillar Seatbelt & Lower Plastics

Remove B-Pillar Seatbelt & Plastics

Remove the seat belt bolt cover and bolt. Then process to remove the lower B-Pillar plastics.

Remove front Plastics

Remove front Plastics

The front door trim plastics are held in place by one female threaded hole & a metal clip attached to the weather stripping. Pictured above is the circular dial just to the left of the footrest.

This was the last of the interior plastics that I removed. You can go another step and remove the entire center console but I didn’t think that was needed for my goals.

Sound Deadening the Front Seats

Sound Deadening the Front

This was plenty of access for me to deaden the floors. You can take it another step and remove the center console but this was enough room for me to access what I wanted to deaden. I was able to reach up along the outside of the center console and apply multiple layers here. You can’t see it but I was also able to lay CLD directly underneath the gas pedal. I did lay CLD underneath the wiring along the edge of the door. This is not the finished product. I laid the material on thick here. Everywhere I saw exposed sheet metal, I covered it with CLD.

Holding Up Carpet with Zip Tie

Sound Deadening Floors - Pulling Up Carpet with Zip Tie

To hold the carpet up, I zip-tied a portion of the base carpet to the center console. This gave me plenty of flexibility to lay CLD without having to support the carpet while applying the material.

Main Floor & Rear Floor

Sound Deadening Floors - Rear and Center

The floor is one of the easiest areas to apply CLD because it’s mostly just big sheets. Just remember to be cautious about covering bolt holes in the floor for the seats and other trim pieces.

Continue on with covering the entire floor which includes under the front seats, rear seats and entire cargo area. The more sheet metal you cover, the better. However, even if you only cover portions of the sheet metal, because you don’t have enough material, it will still make an improvement in sound quality.

Sound Deadening Center Floor

Sound Deadening Floors - Center

You may need someone to help with lifting the carpet in the center to apply a layer of CLD. Directly behind the center console was interesting to access because of the carpet.

You are pretty much finished up at this point. Just reinstall all the interior elements.

Reinstall Rear Seats

Reinstall Rear Seats

I started by reinstalling the large seat first. This was the biggest pain to get out of the 4Runner so I figured it could go in first. There is an L guide along with a bolt that locks into the bracket. Once you get these lined up, secure the bolt into the bracket and then proceed with screwing down the bottom bolt. Repeat this process with the smaller rear seat.

Reinstall Cargo Storage Tray

Reinstall Rear Seats & Cargo Storage Tray

Proceed to reinstall the rear cargo compartment.

Reinstall Slide Tray

Reinstall Cargo Tray

Reinstall the rear cargo tray. Just remember to install the parts in order. It’s easy to miss some of the parts when your garage is filled with every interior 4Runner part. Try to organize all your parts the way they came out so the reinstall goes smooth.

Sound Deadening Hatch

Remove Rear Hatch Cover

Sound Dead Hatch - Remove Cover

First, remove the 10mm bolt near the hatch pull strap. Then using your pry tools pop the rear hatch cover off. Pull down on the hatch cover once you have one push tab unclipped and all clips should pop off. Remember to remove any clips from the hatch and reconnect them to the hatch cover for reinstall.

Remove Speakers and Electrical Bracket

Sound Dead Hatch - Remove Speakers and Electrical Bracket

Remove the speakers, and disconnect the electrical harness connected to the support bracket. Once you have disconnected the harness, proceed to remove the support bracket and plastic cover. Discard plastic cover.

Clean inside of the rear hatch

Cleaning Inside of Rear Hatch

The inside of the rear hatch is covered with grease. Cleaning this with rubbing alcohol or distilled water will make it easier for the CLD to be applied.

Placing Large Pieces of CLD on inside of Hatch

Placing Large Pieces of CLD on inside of Hatch

Reaching inside the rear hatch, apply large pieces of CLD from the top corners to the center covering as much surface area as possible.

Layers of CLD on inside of Hatch

Layers of CLD on inside of Hatch

Make sure you cut holes in the CLD for bolts that you may need to reach later. Removing the rear hatch cover is not uncommon if you work on your 4Runner often. I tried to leave all the bolts exposed in case I need to access them in the future.

Layers of CLD on inside of Hatch

Working Layers on Outside of Rear Hatch

Place a large sheet over the speakers and then make a cut accordingly using a sharp razor blade (utility) knife. This should leave you with a perfect open circle covering the speaker.

Final Layers of CLD on Hatch

Final Layers of CLD on Hatch

Reinstall the speakers and support bracket. I left a large portion of the bracket area open in case I need to access the rear hatch again in the future. After the electrical is connected and the speakers are back in place, you can reattach the hatch door cover.

Questions or Comments? Leave them below!

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Bob SokoloskiJohnAkiTrevor Varney Recent comment authors
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Trevor-SGBD
Member
Trevor-SGBD

Awesome! I actually got a bunch of Eastwood Brand sound deadening last black friday and still haven’t gotten around to it. And this confirms that it’s a big job but this will help me immensely!

Aki
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Aki

Thank you for the step-by-step. A video comparison of before and after to hear the difference in exterior noise level interference with and without music in highway would be very convincing. I’m going to go with Noico 80 Mil since I live in Miami. Cheers!

John
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John

Something I’m going to do in a future upgrade. I’m sure your sound system improved as well by eliminating vibration and outside wind noise. The acoustic benefit alone is worth it and can definitely make it easier to hold conversations from passengers riding in the backseat..

Bob Sokoloski
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Bob Sokoloski

I removed my old carpet and put sound dampening and rubber flooring in and I Love it. Makes a big difference in both sound and ride.

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