These are the magnets that I used (1 for each side)
https://www.amazon.com/gp/product/B0181LX5Q0/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
And here is a picture of where I placed them.
Oh yeah I just lifted the seats up and stuck one to the inside of both hinge mechanisms. I drove around and adjusted them and the sound went away completely. I can snap a pic of where I put them if you want. I can finally leave my seats down with the sub box in. It is certainly much easier than pulling the back seats out and installing spacers or trying to alter the sub box itself.
So I got the magnets in today and stuck them to the hinge under the back seat and now there is no rattle at all. So if anyone is having the same problem it is a pretty easy $10 fix.
I was having the exact same problem last week. I drove until the gas light came on then went to fill up and it took me about 20 minutes to get a quarter of a tank of gas into the truck. It kept triggering the shut off mechanism on the gas pump.
I took my sub box out and the rattle stopped so that is definitely the problem. The box is keeping the seats from going all the way down by about 1/8" or less but I guess that is enough to make a super loud noise. It sounds like someone slapping two pieces of metal together and it's driving me crazy.
New to the forum. Picked up this truck a few months ago and I've done quite a bit to it. 2016 Z71.
2/4 Drop
24x10" Rims with 305s
Black bow ties
5% tint
Tinted tail lights and 3rd brake lights
Debadged completely
I've also added a bed cover, exhaust system, subs, cold air, shorty antennae etc since these pictures were taken. Thinking about making a thread with my build if anyone is interested.