3rd row seat fabrication - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Appearance > Interior

Interior Interior

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Old 08-09-2009, 10:21 PM
NYFlapjack2 NYFlapjack2 is offline
Junior Member
2006 SAAB 9-7x
Arctic White 4.2L I6 AWD
Join Date: Aug 2009
Location: Syracuse
Posts: 5
3rd row seat fabrication

I used to need one more youth's 3rd row seat. Not for a baby seat but one out of a booster and up, for standard wheel base a side ways one was best and offered more leg room + storage even while a passenger is back there.

I saw a few aftermarket ones even thought of fabricating the side facing ones from other car-wagon brands which do this style too off Ebay. I thought they were safe & sound enough but OMG expensive. I knew I’d need one for a ticket from the police would be big $$$$ too....

Luckily 2 summers ago I saw on Craigslist... a GMC PU truck, fixed center seat section (not folding not with storage bottom).

It came with seatbelt and the legs to mount in another GM truck…….. On or off the car it is rock solid, using the GMC OEM safety belts and frame work and I bet plusher than the aftermarket ones....

Sorry I didn't photo the actual build but I have included the results...It slides in 2 of the triangle floor hold-downs and with only 1 bolt ........

It mounts solidly through the 3rd ring with that large bolt & washer. It won't budge. It is less than 50 lbs and quick in & out. When I am driving solo I like the rear head rests down and with the 3rd row, they flop down and this bucket is out of the way not seen in my rear view either.

You can fabricate your own, email me with questions, I am selling mine too, Syracuse Craigslist Autoparts PostingID: 1304421873 or
you could go here for theirs...

Continuing on the how to do it yourself.....
The OEM seat unbolted from the 4 legged black metal stamping. I flipped over and reinstalled so it was like inside 4 legged bucket…Took it off & the front wings get power hack saw hacked way off underneath. The rears get whacked above the seat belt.

At my local Tractor Supply Company I got the solid large diameter solid steel rod, which fits the tangents of the tie down rings in floor of our SUVs perfectly. Got the Strap Hinge which I forced open and stuck in a shaft of the same rod for the front 3rd ring to center mount loop, as well the all thread bolt connector for the 1 bolt location. Welded it all up.

Other random details, the all thread barrel connector was drilled out to fit the solid rod and cross drilled and bolt pinned. The black metal leg stamping assembly is cut up and 2 separate bolting lands for the strap hinge to well all around to it…I made the rod and strap hinge details tack welding for full fit and then unbolted seat and went to town welding. You’ll find the rear solid rod rested well in a valley in that black metal stamping…

OH and as you can see I kept the GMC cup holders too!!!
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Old 08-09-2009, 10:29 PM
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lynch55 lynch55 is offline
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2005 Chevy TrailBlazer LS
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Thats a cool idea! We have run across a few times when one (or two) of these would have come in handy!
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Old 08-09-2009, 10:32 PM
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high-voltage high-voltage is offline
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I bet this is not dot aproved!
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Old 08-09-2009, 10:33 PM
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DZP DZP is offline
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2003 Chevy TrailBlazer LS
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Old 08-10-2009, 12:12 PM
NYFlapjack2 NYFlapjack2 is offline
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2006 SAAB 9-7x
Arctic White 4.2L I6 AWD
Join Date: Aug 2009
Location: Syracuse
Posts: 5
not DOT approved

Oh yes agree and easily know / recognize that this is not been submitted for DOT approval.

Now for everyones consideration consider your structure materials. I have gone over if not equal to OEM utilized in this construction. The complete bolting down and additional welding (not spot) to the base OEM stamped frame...and stock OEM seat belt use. Perhaps re-look at the other purchased models attachment points (believed to be same bolt location).

You also may draw your own conclusions as to riding in the back for the brief trip sans anything, riding 4 across in the back seat...

As well the riding while side facing...vs. back facing seats, styles others offer. Many OEM small P/U, or other SUV does these same things ... vs. the price of unrestrained passenger type tickets...

Anyhow I surfed here, I saw others asking how this may be accomplished, this is but 1 option for their consideration too.
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Old 08-10-2009, 12:20 PM
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the roadie the roadie is offline
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2004 GMC Envoy SLT "Roadiemobile"
Extreme Offroad Pewter 4.2L I6 4X4
Join Date: Apr 2005
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Except for using hardened hardware to completely avoid that possible criticism, I think you've answered many objections and have a very useful project. Thanks for posting, and make sure to stay around in the trailvoy community for when you encounter the other typical things that go wrong as the vehicles age.
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