TheElementalCashew

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This PDF has pretty good instructions for getting it all installed. Good luck. 2020 Silverado Dash Cam.pdf

You can find the power you need in the passenger side fuse box. I have my DR-900S wired up this way.

For future reference, Boost Auto now has harnesses to wire up the lighting on tow mirrors. https://boostautoparts.com/collections/gm-2019-style-tow-mirror-harnesses

I ran the 4” kit and 35s on my 2019 for a couple years. It’s a good kit, didn’t have any issues, but there was a good bit of trimming required to fit the tires. These pictures are without coilovers, I bought them after the lift was installed but never installed them. Still have the coilovers sitting in a box but I’ve since moved on to a 2500 AT4.

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My 21 AT4 came with the switches installed and I’ve had the wiring sitting in the console for months. Thanks to this thread I got it all installed on Saturday, just took a couple hours. The most difficult part was getting the fuse box screws installed without removing the whole kick panel. I still need to run some wires back through the firewall for accessories. What gauge wires is everyone using for that? Loom or no loom?

I do still have it. I can’t confirm what it’ll work on, but I had matched that part number from a 2020 AT4. WAMS might be able to to confirm for you.

I had this problem on my 2021 AT4. Very soft brakes that would only get firmer if I pumped the pedal, and creeping at stop lights. This fixed the problem for me: place the truck in park. Depress the brake pedal as far down to the floor as physically possible. Release the brake pedal and let it travel on its own all the way to the top. Repeat the process one more time. After doing this, my brakes act as I would expect on a truck this size.

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I’m just curious if the stock wiring can be hacked up and AMP steps used to replace the stock steps. Waiting to see how poorly the stock steps do in the snow this winter before I try though.

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These should fit GMC Sierra AT4s and Silverado Trail Bosses with a 4” BDS lift, or a standard Sierra or Silverado with a 6” BDS lift. May fit with other manufacturers 4”/6” lifts, but that’s on you to confirm. Part numbers are below. Part # 88302160 and 121633 Fox coilovers (non DSC) and mount kit: $1400 plus shipping One of the coilovers rubbed against the other during shipping, causing cosmetic scrapes. I’ve included a picture of that.

So I believe these are the blocks and U-bolts. Also have the stock knuckles, tie rod ends, and rear lift Rancho shocks.

My 2021 2500 AT4 Diesel Crew Cab Short Bed is 3210lbs.

I think I have all the parts from the stock lift minus the front axles, I'll take a look later today.

If anyone needs a VPM with more channels, I have one part number 84757718 that I'm not using. I tried to use it on my 2019 and WAMS couldn't get it to work. They said they can reprogram it for someone else though.

What do you want for the camera shipped?

Those are 2500 mirrors. Those have puddle lights on the bottom, the 1500 tow mirrors don’t have puddle lights.

There is an option in your radio menu to turn the blind zone feature off, if you see an error at all.

Ran into a few issues along the way. First of all, my 2019 VPM didn’t have the necessary software for the tow mirrors, so I had to buy a 2020 VPM ($500) and send it to WAMS for programming. I have the new VPM back, but this one has double the coax connectors that my 2019 VPM had (10 vs 5), and of course the camera connectors have changed location. The data and power hook right up with no issues. As of right now, with the new VPM I am getting a blue screen and no cameras. WAMS has been very helpful and has sent me wiring diagrams for the connectors, so when I have some time this weekend I plan to swap coax connectors around to the right locations. Also worth mentioning, the 2020 VPM is physically larger than the 2019, so I will have to do some modification to remount it properly.

I pulled the VPM today and drove around for a bit. It immediately threw three CEL codes related to comms when I started it, but after clearing they haven’t returned. Obviously the cameras and app don’t work anymore, but everything else seems to be normal.