GMC-AT

I have no clue - I paid a local shop to build the box and install.

here you go guys - AVS, had it installed for almost 6 months. Went through car wash many times. No issues, fits great.

My 8 speed in my RST is butter smooth. I never understood the obsession everyone has with more gears. My 2016 was a 6.2/ 8 speed... it was also butter. Cant argue the 6.2 is nice ... but I will say I don't miss it. The 5.3 trucks this year are faster than ever... and to be honest I can't tell a huge difference from this truck and my 2016 6.2 (which was tuned btw)

Yes

I purchased the chip from here - https://www.shopchevyparts.com/electronics/2019-silverado-1500-navigation-system-conversion-kit-navigation-radio-upgrade/84531832-p-92300645.html OEM - came with all the factory codes, serial numbers, etc. I told my dealer the price of the chip and they told me they can't get it for that cheap... so I got it online and they programmed in the truck for FREE

disconnect from your wifi network.. and it wont do it.

I purchased the Navi SD card on my own online.. dealer programmed for FREE. Small town dealers are the best..

pic

some more pics. The box is actually fiberglass molded around that factory box. I need to clean up the amp a little.. but you get the idea. Also - adding a base knob up front is important. This set up is probably the same less $$ as the factory kicker sub.. but I can guarantee it rocks more.

I had my own made...fits right inside the factory box under seat. Just factory BOSE with a little extra 12in kick in the back.

Yes, I should have noted only sliding rear windows. And I'm just talking about the large strip at bottom. Ok... looks as it's by design. Weird though..

I noticed today my drivers side rear window doesn't have the brown defrost strip on the bottom of the window. The passenger side has them all the way around. Can someone else look at their truck? Not a big deal, just not sure if that's by design or a screw up on my truck. Seems weird they would do that by design..

does it fast charge?

my 2016 used to do that.. when I would take out of garage and the hot sun started beating down