Alright, I will keep it going! Today, I finally installed the hardware to complete my on-board air. I tow a lot of different trailers, always rotating my tires (60psi f/80 psi r) ride dirt bikes, have kids with a million balls, so...
I just got a 2026 AT4X HD and am loving it. My AT4 1500 was stolen from my driveway so i figured it is time for an upgrade. Glad to be here and look forward to learning and...
I finally did the SDHQ brackets and the BAJA Designs XL80 ditch lights.. still need to adjust the angle. Tied them into the upfitter switch.
Thought I would post a couple of clips from my mangoal dashcam, front and rear, of a near miss I had last month. This is mainly to show the clarity of the video that the dashcam captures, but...
I didn't care for the chrome badge on the fender since I changed all the other lettering over to the blacked-out lettering so I changed the badge. I found these on Ebay for $88 and saw them on...
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We normally pull the boat out of the water in November, but we have a busy next few weeks and with the price of gas at the marina's..... time to pull her out and get her ready for her winter nap...
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But will it have an oil dipstick?
Hello all, I am a newish owner of a 2026 Sierra 1500 AT4X (non AEV) in Sterling Metallic. Absolutely loving the truck so far, and have learned a lot from lurking here. So far I’ve done the Range...
GMC AT4 News
9
I’m Dan, live in Millcreek Utah. I’ve debated if I would enjoy a truck for years, and finally decided (because we actually needed another vehicle) to pull the trigger and get into the canyon. I’ve...
I've been looking at your cam for sometime now. lots of highway driving in Austin TX with some off road and ranch roads. Leveling kit fuel rebel wheels toyo at3 295's upgraded audio/ tint PPE...
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https://gmauthority.com/blog/2026/09/gm-8-3l-v8-duramax-diesel-output-revealed/ 555hp and 1230 ft*lbs of torque. Also "In addition to the new diesel engine option, GM says that its upcoming 2027...
Hello fellow AT4 enthusiasts and weirdos, Good afternoon all, new to the forum but not new to GMC. Just came back after 1yr ownership of a (purchased used with 25k miles) 2022.5 Silvy 1500 TB...
From the dove opener earlier this month. *AI enhanced editing
Hey AT4 Forum, To celebrate our Anniversary, we're running a quick giveaway for 1 free Mangoal 4K Front / 2K Rear STARVIS 2 Dual Dashcam (covers '22-'26 Sierra 1500 & '24-'26 Sierra HD) with free...
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I think the amber DRLs and the GMC is starting to grow on me.What do you guys think?
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It was time for differential fluids again, so changed the front cover out too. Banks out back. Going to be honest, there is no real benefit. It may cool faster (if I was doing 120mph maybe)...
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So... update.... turns out it wasn't the transmission. The aero louvres were engaging and rubbing on a horn bracket causing the clunck. I guess there is a service bulletin on this too. Anyhooo...
Got a few hours to myself this weekend and was able to accomplish: 1. Molle Panels: happy that this ended up being less complicated than I thought (so many forums gripe about the panels not...
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Update! I went with the another unit from 404 parts and it didnt even last a year. I am trying the venom switchback unit and I am loving it so far! Lets see how long it lasts!
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GMC AT4 Contests
10
Hi everyone, New to the forum as I just picked up my 2026 Sierra 1500 AT4 on Saturday. Love the truck except as I drove it on the weekend, it kept making a "clunk"/"thud" on the down shift...
GMC AT4 News
12
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2022 1500 AT4 3.0l Duramax Titanium Rush Ready Lift Leveling Kit Icon Alloys Compression 17x8.5 -0 offset Toyo Open Country ATIII 35x12.5x17 GatorTrax Tonneau Cover
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GMC AT4 HD Talk
15
I like the Chemical Guys leather cleaner. They have the perforated leather cleaner, but I haven't had any issues with the standard leather cleaner. It's a spray that you use a soft brush with...
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This is why I keep working on a 1973 International Loadstar. Some day it will be the only vehicle I will feel "safe" and free to drive.
This is why I keep working on a 1973 International Loadstar. Some day it will be the only vehicle I will feel "safe" and free to drive. Right there with you, keep'em running!...
IF I go the diesel route, it will be International make. I refuse to bastardize it and throw a cummins in it. Nothing against the old 5.9! Just wanting to keep it brand...
Mangoal
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Thanks! Glad to officially be part of the community. We’re the tech team at Mangoal, specializing in OEM-style dashcams that integrate directly into the factory mirror housing. We’ll be hanging...
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Mangoal
5
Hi everyone, Just wanted to introduce ourselves—we're the tech support team at Mangoal Dash Cam, glad to officially join the AT4Forum community! We're mainly here to help with any tech questions...
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Definitely a great dash cam. Blends in very well with the oem look. I like mine. Just wish there was an easier method to connect my phone to it.
Following an off-road wet trail trip to Birkenhead Lake BC, spent hours washing off fine sand off the truck exterior and below. I do get my truck dirty too 😁
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GMC AT4 HD Talk
10
I think it's high time us HD owners had a WDYDTY HD today, thread. Maybe @24Titanium3500 would like to start! 😉
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Added the Gibson dual ceramic exhaust tips. I would have liked them a bit larger diameter but am enjoying the new look and quality.
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Finally did my front diff cover. Now ALL fluids have been changed!
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GMC 1500 AT4 Talk
13
Perhaps because mine's a different model. Finally GMC Spyware update GM 661.10 showed up on the DIC and I installed it.
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AT4 of the Month Winners
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Thank you! Now that hunting season is back in full swing, I hope to get some more good photos this fall.
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GMC AT4 Talk
15
I am fully deleted and for the sake of longevity I only had a 30 hp increase tune. I didn’t want to start breaking parts once it’s deleted that truck makes plenty of power. There’s really no...
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Hello, New to the truck world. Always had SUV or a car. Been driving my 2006 Subaru STI since 2006 with a few mods. Just purchased a 2026 2500 AT4 diesel. No mods planned yet for warranty reasons...
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Hello gang., very long time coming.. Had almost a dozen Toyota's and got fed up with their hide and go seek nonsense with their current twin turbo debacle in a 2023 TRD Pro.. Moved into a GMC...
8
hey all, just a little update ... I already tinted the front windows and blacked out the fender flare yellow lights ... bought these -...
The biggest thing I’d look at here is the power path. If the refrigerator and Starlink are both DC devices, running them through the Bluetti’s AC inverter and then using an adapter to convert AC...
I live in Live Oak, Florida but for the last two summers I’ve been volunteering in Shoshone National Forest. I had a solar system installed before this summer. I have 1200watts of panels installed...
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Jalama beach Ca. Beat the heat. Space X launch close-by flys overhead.
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Just found this forum while looking for info on the trailer TPMS system. Bought new a 2020 HD2500 Duramax that I've had for almost 7 years, 150K on it. Mostly pulling our Airstream and my...
2inch Front leveling kit with UCA. Mudflap Delete 2inch Hub Centric Spacer 35x12.5x20 Cooper Discover Tires Black American Flag Tonneau Cover. Some trimming required for minor rubbing now it runs like a dream
Avatar is boss. Not trying for brownie points or brown nosing, but he finally put some effort into his profile's avatar, and not just having a "A"!
I have had my 2026 AT4 for about 3 weeks now and it is a constant struggle to get the android auto to connect or consistently connect wirelessly to my phone. I have tried AI...
Hey guys. Hope you’re all doing well. Just got my truck back and had the DV8 front bumper install. Gives the Canyon AT4 a more aggressive look. The fenders had to get cut back. Good quality bumper...
GMC 1500 AT4 Purchasing
5
I would always advise against a first year model change. However a new powerplant is enticing, knowing what is under the hood could leave you walking, now.
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GMC AT4 Talk
6
lol AI? I’ve always thought the admin here was you 🤘🏻 Nah, he's the bar owner, I'm just the bouncer! 🍻
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First time GMC truck owner here. Recently purchased a 2026 Sierra 1500 AT4 and absolutely love it. Hoping to get the latest updates, news, tips & tricks to keep my truck purring like a kitten.
GMC 1500 AT4 Modifications
8
At least the dealership didn’t say anything about DFM or stop/start.
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GMC AT4 Talk
9
It must be a LD, with it's console shifter? An HD will shut off and a pop-up appears on the dic to, "Shift to Park." It might be a gm feature, but I'd call it a bug. How do you put it into...
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GMC AT4 Talk
10
That's interesting. Is this different than connecting your cell phone directly to the vehicle's wi-fi? If I connect my phone to my truck's wi-fi, and I don't have a truck data plan, my phone...
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GMC AT4 Talk
11
I found a problem with the Wi-Fi hotspot, which is required for wireless AA and ACP, that I'm very confident is related to these issues. For some reason the hotspot SSID is randomly being secured...
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I recently purchased a 2026 gmc at4 1500. It has 20" wheels and Bridgestone street tires. I'm not a fan of either and wanted to know if anyone has installed 17" wheels and if they had any...
GMC AT4 HD Talk
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GMC AT4 HD Talk
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GMC AT4 Talk
15
Pre refresh, 2021 LD with real column shifter ( which is why I went with pre refresh! ) behaves exactly like the HD in this regard. It must be a LD, with it's console shifter? An HD will shut...
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January 2026 near Big Bend, TX for a week of quail hunting. Headed to southeast New Mexico in a few weeks to chase dove.
Hi, I would like to introduce myself. My name is Doug and I am new to this forum and a new AT4 owner as well. I just purchased a new 2026 1500 AT4 yesterday with the 3.0...
Well guys after months and months of debating and researching on this site and others, today I pulled the trigger on tire size and brand. Went with the Toyo AT3 in a 285/60/20 size on my...
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GMC AT4 Talk
5
Purchased the truck used and it had a lot of stone rash on the lower rockers. Dealer touched them up and it looked better. Fast forward 6 months and I don’t like the rash touched up look. I’m...
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New here, looking for real world experience from people. Completely stock 2025 1500 AT4 LZ0. Came with 275/60R20 tires on the 20x9 silver machined wheels with dark pockets. I will be keeping the...
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Dear General Motors Corporation, I absolutely love my GMC 1500 AT4. It’s powerful, comfortable, sharp-looking, and probably one of the best trucks I’ve ever owned. Unfortunately, I may have to...
As Shorsey says... "Hell yea, Fuck yea!" My last truck years ago was a 2016 GMC Canyon All Terrain - my old favorite truck of all time... got it used and had electrical gremlins in it so I got...
I have a 2022 AT4 crewcab 6.6 liter 2500. The plug in the bed and the plug in the cab or not working. I am able to push the power button on and it does light up but there is no power going to the...
.3 miles per gallon isn’t a significant enough difference to be meaningful. I’m not poopooing your win, but it’s scientifically insignificant to the point that it’s not worth the mention. As...
I would start with some kind of a tune or pedal commander type device before you go out dumping thousands of dollars into a supercharger to throw on top of an already unreliable GM v8. Especially...
GMC AT4 Talk
13
This is also an issue with wireless carplay. I bought my truck a month ago and my carplay connects maybe 10% of the time. I took in to the dealer last week and they said they updated the...
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I have been having the carplay connection issue since the last update. I changed the "fast start up" to off, and it connects most times. The last time it didn't connect, I went to the apps and...
I upgraded to the VSE fuel filter system. It was a little bit difficult stuffing it in with the TITAN 56 gal tank but I have way more confidence with this two filter system system over the small...
He's really great to work with. Did mine for the 3.0 Duramax and then remade for the trade.
GMC AT4 HD Introductions
I’m running Bilstiens too. I have a longbed 3500 and you can really tell that these shocks are superior to what they come with. Both hauling and empty…..
As Shorsey says... "Hell yea, Fuck yea!" My last truck years ago was a 2016 GMC Canyon All Terrain - my old favorite truck of all time... got it used and had electrical...
I just picked up my first AT4. The other GMC pickups I had were the elevation I LOVE this truck !! Not sure what mods I’ll be doing but I’m sure I’ll get some great ideas from everyone else on...
GMC 1500 AT4 Talk
5
This is the first step in finding a new home for my truck; no! I’m not selling my truck but as several of you may be aware, we are selling our home in view to relocating to Las Vegas, NV to be...
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Just to give a quick update, I had to buy a scanner to clear the DTC and now I have no issues. Front brake pads show 48% and the rears at 100% as they should be. Thanks to all that responded and...
Went to the truck stop and filled my def. It was down to 1 bar on the dash. I honestly forget about it most of the time since it doesn't use much at all. Actually, my wife was the one to remind...
GMC AT4 Introductions
8
I need to go check my whiskey stash; seems like @gemarsh may have drunk it all
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GMC AT4 Introductions
9
I need to go check my whiskey stash; seems like @gemarsh may have drunk it all Seriously though, short people are 'more down to earth'! 🤣
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GMC AT4 Introductions
10
I'm getting more down to earth :ROFLMAO:. I used to be a smidge over 6' tall and I've shrunk to 5' 9" and probably shrinking more. My problem is I'm growing horizontal.
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GMC AT4 Talk
12
Did they do it under that bulletin? I don't think so since mine were replaced long before the bulletin; I kept pestering them until the second or third visit, a tech listened below with a...
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I mean it's possible, no one here is going to be able to diagnose it over forums. If you aren't happy with their diagnostic and you're under warranty - different dealer. If not, any competent...
New to the forum but have been researching here since I picked up my ride in January 2024. S&B cold air intake. Smart Cap topper. Banks A pillar module idash M&R Front grill light bars Frontrunner...
A huge congratulations to @TheShark, our July 2026 AT4 of the Month winner! This killer shot captures some impressive suspension articulation and a great day on the trails in New Hampshire with Ridgeback Guide Service. 🏆 Check out all...
Finally got around to installing my onboard air
Being a South Paw, I was needing a solution for the left side of our truck. I found a custom door pouch 'organizer' from Door-Daddy. They have an insert for the front cup...
Here are two terrible quick ones. We also did a family photo before my wife traded hers in. All diesel, and all GM. Daughter, wife, me (son drives a Honda and therefore wasn't invited).
AT4 of the Month Winners
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Thanks for the kind words and the votes! I have been trying since I joined the forum and the win feels good😎 Edit: that new big red badge looks great too!
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The August AT4 Forum Photo Contest is officially live! Whether you roll in a Sierra, HD, Canyon, or Yukon, this is your chance to show off your rig and claim Truck of the Month bragging rights...
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Turned out to be a bad fuse block above battery and right front wheel speed sensor.
AT4 of the Month Winners
10
Thanks for the kind words and the votes! I have been trying since I joined the forum and the win feels good😎 Edit: that new big red badge looks great too! Your raising the bar for future entries!
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GMC AT4 Introductions
11
Welcome. What is all included in the nightfall package? I see black badges, sportbar and running boards. 20" Machine faced/dark pocket aluminum wheels, rocker panels (not running boards)...
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AT4 of the Month Winners
12
I really wish the truck had full lockers but they didn't offer them until the AT4 X released. Great footage of me having to spin the rear to get it to lock
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GMC AT4 Introductions
13
Snohomish area Welcome! I also have black 2026 at4x diesel in Seattle, also purchased in Boise 🥳
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AT4 of the Month Winners
14
Drivers seat makes a knocking noise that is also felt in the seat when turning left to right, no movement front to back. Problem since I got the truck, took it to the dealer at...
