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Old 06-07-2019, 05:00 PM
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Default Jute Seat Back and Package Tray Insulation

I posted this originally in the 67-69 Firebird section, but it may get more traction here.

I have a new cardboard seat pack with jute padding and jute package tray insulation that I'd like to get installed this weekend.

I just need to know which direction the seatback faces. Does the jute lining face into the trunk, or into the passenger cabin?

The jute package track insulation, does that get adhered to the bottom of the shelf in the trunk, or on top, below the package tray insert?

Thanks in advance!

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Old 06-28-2019, 11:34 AM
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Although not specifically familiar with 67-69, on the 71 A and F bodies I've had, the seat divider was adhered to the cardboard and faced the trunk.

The package tray when originally removed from the A body was not adhered at all, but that could have been due to human error/preference on the assembly line. On the F, it had been previously replaced, and was adhered to the package tray.

I will say I'm not sure either is an example of a 'correct' installation, as in how they were assembled on the line, though believe it is correct.

Not sure if you had other responses on other posts, haven't really paid that close attention.

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Old 06-28-2019, 12:35 PM
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Quote:
Originally Posted by HWYSTR455 View Post
Although not specifically familiar with 67-69, on the 71 A and F bodies I've had, the seat divider was adhered to the cardboard and faced the trunk.

The package tray when originally removed from the A body was not adhered at all, but that could have been due to human error/preference on the assembly line. On the F, it had been previously replaced, and was adhered to the package tray.

I will say I'm not sure either is an example of a 'correct' installation, as in how they were assembled on the line, though believe it is correct.

Not sure if you had other responses on other posts, haven't really paid that close attention.

.
Thanks for the response. I had gotten some information over in the first gen bird area.

I did install the seat back with jute towards trunk and I installed the jute on top of package tray. For now I did not physically adhere it, I just placed it under the tray card. I intend to add a sound system back there, so I figured not adhering it will aid in installation.

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Old 06-28-2019, 01:15 PM
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Yeah, true, I recall several times when installing speakers, trying to cut the jute was a pain, so being able to remove it is a good thing.

I did dynamat on the rear deck first on my latest build, and there's room to do like 1/8" dynaliner instead of jute. That is a great mode, helps block heat from the trunk into the compartment, but it's not an OE type install of course.

Same with the seat divider, you can do dynamat on the divider, and stick dynaliner on it and face it to the trunk. You can also put dynamat directly on the bracing, with the sticky side facing the trunk, and stick dynaliner on the trunk side, with the sticky part facing the bracing/forward. Helps dramatically on heat, noise, and some vibration.

Not sure if you saw on my build thread, I cut the bracing out of the deck, mounted MDF, did 6x9 cutouts, a pair of 10" sub cutouts, and built sub boxes on the underside. Covered that in dynamat, and mounted an amp board on the trunk side of the seat bracing.

Just thinking out loud!

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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
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Old 06-28-2019, 01:30 PM
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I actually did the dynamat custom cut sections on the trunk floor and package tray, then also lined the trunk with DEI carpet lite. Additionally I seam sealed around the wheel wells and down where the trunk pan meats the 1/4 panels aft of the wheel wells. Used a seam seal liquid followed up with aluminum tap on top of that.

Started with the trunk as proof on concept on materials, quality and performance. I'll be working forward through the passenger cabin next.

So far the treatment I would say was well worth the cost and additional weight. In total it cost me about $350 to do the dynamat, Undercarpet lite, jute backed divider and package tray. Nothing rattles back there any more, trunk temps have dropped dramatically and although you can still hear the exhaust (which I'm after) it's not screaming at you. I don't have a dB meter, but if I had to guess, with the windows up total amplitude from the rear of the car has dropped 6-10 dB.
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Old 06-28-2019, 02:42 PM
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10db is a pretty good improvement, and worth the effort!

What kind of seam sealer did you use, and aluminum tape?

I did dynamat on the trunk floor, didn't want to run it up on the inner wheel wells because I wanted it all as hidden as possible. But did put the full trunk mat in from a cutlass, and did the accessory mat on top of that. It should help, and be a noticeable difference.

I did the thick dynaliner in the compartment and firewall, as well as dynamat. With the carpet, and the carpeted floor mats, it should work well. Did dynamat on the doors, could probably have squeezed the 1/8" dynaliner under the panels, but didn't even try. Figure it will be much better than OE and enough for me.

I did the inner wheel wells in the compartment behind the 1/4 interior panels, and went as far as I could reach on the outers. Think I did some dynaliner too, but not recalling at the moment.

My main concerns underneath the car and in the cowl inner structure areas, was corrosion. So used a couple 3M products, as well as some Eastwood inner frame rail coating. Feel pretty confident it will help ward of corrosion for a good amount of time.

Couple problem areas that should be addressed on a 68-72 A-body (and others) is the cross brace along the top of the wheel hump where it meets the floor pan and inner rear wheel houses, and the floor pan braces. Of course the rockers too, and even added a couple drain holes there.

Only time will tell!

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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
http://forums.maxperformanceinc.com/...d.php?t=760624
1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car
https://forums.maxperformanceinc.com...ght=procharger
Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be
  #7  
Old 06-28-2019, 03:11 PM
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I don't recall the name of the stuff it was a Permatex product in an orange tube. It was a little more liquidy than I'd have preferred so I used just some store purchased aluminum tape to help keep it in place while it cured. Just the typical stuff you would use for a hack repair job on a fender.

The DEI undercarpet light is pretty thick stuff, about half an inch in thickness. It's a composite material with several different layers to control heat and sound.

https://www.amazon.com/Design-Engine...82334059&psc=1

It was fairly easy to work with and used a permatex carpet adhesive with it. For the most part it molds fairly well, but there were a couple areas with compound corners that I had to cut some sections to get rolls and air pockets out.

I haven't done anything with it yet, but I also have some of the boom mat spray on sound deadener. The dynamat custom cut trunk section doesn't include anything for hte wheel houses, so I figured I'd use the spray on stuff there. Although it's made enough improvement I might use it elsewhere.

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