Toyota Tundra Forum

Tox, I think you are probably right about the foam helping protect the windows, especially the window mechanism.
I have had nothing but problems with the windows falling to the bottom of the doors in all of my trucks since 1985.
The problem was from the windows bouncing up and down when the windows are in the lowered position, eventually leading to the window mechanism failing.
Nissan replaced the doors 5 times on my two Titans because of this. The windows on the Titan are much larger and heavier than the Tundra's.The Nissan rep eventually came to the dealer to see why I had this problem, and he said that he thought it was because I was driving on rough roads with the windows down, he was right.
I had the same problem on my 1st gen Tundra, but only once.
Before I bought my new Tundra, I called Toyota and asked if I was going to have the same problem with the windows I had in the past.
They said that is why the windows in the Tundra are now smaller and lighter than before and that they had done something structurally to take the pressure off the window mechanism when driving on rough roads with the windows down.
I would guess that the foam insert is what they added to the structure.
I have about 10k miles in 4WD on my ranch roads and notice that while the widows do move up and down a bit, it seems as though they impact is cushioned a little.
My 85 Toyota had the same problem and to this day the drivers window is inoperable, the entire window mechanism is fractured in several places because of the windows impact.
One way to lessen the impact is to keep the window up a few inches from the full down position, this keeps the window somewhat rigid and reduces the bounce.
Of course I could be completely wrong and foam has a different purpose.

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2007 Tundra DC Limited 5.7L 4X4
TRD,NAV,TOW
Xlerator Exhaust
aFe Stage 2 CAI
BFG AT/KO 285/65/18
Desert Sand Mica

Bill, these aren't near the speakers. They are below the door arm rest area.

Skyhammer, I think what you are describing is what these pieces are for. I think they would keep the window from swinging side to side when on rough terrain. Maybe I can remove those bump-out pieces from the door panel and screw them into the cover panels I am making.

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2007 SR5 Crewmax 5.7L 4x4
Mods: nerf bars, Truxedo tonneau, radar detector power, 3M clear bra, fog lights, black billet grille, rear differential breather, parking sensors, Line-X, power tailgate lock, hood safety latch mod, one off driving lights behind grille, Pioneer NAV w/ OEM camera, Flowmaster 50 SUV dual/dual, blue LED dash lights, Volant CAI, Llumar tint, CompuStar Pro alarm, ProComp 6066 20" wheels, Cooper Zeon LTZ 275/60/20 tires, OME HD coilover lift, Firestone helper air bags, stereo cable lock, Tekonsha P3 brake controller
All mod descriptions and pictures © 2007-2009 by Toxarch. They may be copied only for personal use and the mods may be done for non-profit only.

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2007 Tundra Limited Double Cab 4x4 Super White
Volant CAI
Pioneer AVIC Z-2 (hard drive upgrade to AVIC Z-3)
Key FOB Tailgate Lock (courtesy of Toxarch)
OEM back-up camera w/flip down monitor microswitch mod
Sirius Satellite Radio
WeatherTech Floor Liners
20" OEM alloy wheels
Line-X Bed liner
UWS Black Powdercoat Low Profile Toolbox
DU-HA underseat storage unit
JC Whitney Black Nerf Bars
Lund Interceptor II Bug Shield
Tekonsha Voyager Brake Controller

I bet its for insulation, sound and temperature.

It's a closed cell foam and plastic so it can't be for sound. And it's a small piece so it can't be for sound and temperature.