Can you add a 3 rd row to a Tahoe that didn't come with one? Or did they have to to come from.the factory with it

 

You can't get the seat from GM but it could probably be added if you can find a used one. They get stolen alot actually, crooks bust in the rear glass and pull the whole damn thing out.

 

The frame to bolt the seat to is missing from vehicles with out a 3rd row seat ,
Not sure if that bolts or is welded to the floor .

My Tahoe doesn't have a 3rd seat , I thought about adding one at one time but never investigated the brackets . Just going to buy a suburban lol.

 

I added one, you just have to buy the brackets and seat. When I did mine I bought it all on eBay.