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...
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...
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
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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! Your raising the bar for future entries!
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GMC AT4 Introductions
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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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GMC AT4 Introductions
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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
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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...
I finally had a free Saturday and tackled onboard air. I ended up putting a generic ARB-style twin compressor behind the passenger side fender using the bracket that came with it. I looked at mounting it under the hood, but there...
Picked up a 2025 GMC Sierra 1500 AT4 in Onyx Black here in Oklahoma with just 20,000 miles. It's the 3.0L Duramax, and it's bone stock...for now. I'm trying to decide between adding a level kit...
Good morning! Just purchased a nice used 2024 GMC AT4X Sierra 1500 with the 3.0 Duramax. I had one similar a few years back in the regular AT4, and then a Canyon AT4 after that had to get rid of...
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Just traded my 23 Colorado ZR2 for a 26 Sierra AT4X and absolutely couldn't be happier to be back in a fullsize. Had a 2014 Sierra before the Colorado and thought the smaller truck would work.
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2026 3500 AT4, upgraded wheels, black package. Had it 7 days now.
What engine did it have in it? Looks like the 3.0 by the plug on the front bumper? And how did you have one available to drive? Thought they're still months out... If you live near the proving...
Hello, My Name is Aaron. Thanks for allowing me to be a part of this group. A little bit about myself. I own a company that builds emergency vehicles for state, local, & federal agencies in...
GMC AT4 HD Problems and Issues
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GMC 1500 AT4X
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MultiPro Tailgate Real World Usage: Works great for those sporting event tailgates!! The Kicker set up is always a hit!! I use that step during tailgating to set the TV and use the speakers as a...
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GMC AT4 HD Problems and Issues
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So after 13 months of owning my truck I am still having issues at startup with no audio. Wednesday I spoke with the owner who actually took the time to talk to me and I showed him the PIT bulletin...
Just got to check one out today. Thing sounds gorgeous. Its burbles and has a baja mode. Im in love.
MultiPro Tailgate Real World Usage: Works great for those sporting event tailgates!! The Kicker set up is always a hit!!
Glad to be here. Hope everyone is doing great! I have the Max towing option which from what I'm told pretty much has the 1 ton diffs and suspension. anyone got any thoughts on...
Hey yall, my name is Tyler and this is my first newer truck and first diesel. The wife and I decided on a 2024 2500 AT4X HD with the 6.6 Duramax. Thunderstorm Grey, awesome rig! We live in...
GMC 1500 AT4 6.2L V8 engine
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Just my 2cents, but adding a cold air intake doesn’t help much. If you increase air intake you’re still limited to how much air is leaving (exhaust). Additionally, today’s trucks have fine...
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GMC AT4 HD Modifications
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I understand this is an older post, but I’m curious about the gear you outfitted on your truck. Specifically the Baja Designs lites. You wrote “CarPlay and voice controlled” next to it. The lites...
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Got my truck last Saturday and immediately left on a week long work trip Sunday. It was hit or miss for connection the entire time and randomly although showing the phone connected and on a call...
If it just the clear coat, buy some touch up clear coat. Apply a very small amount ( one very very small drip that just barely fills the chip. Then walk away for 24 hours. Then check it. If the...
Have had mine for over 2y and the finish on both of them are coming off. They replaced one under warranty. I haven’t filed a claim for the second one. This is the step surface on one boards. This...
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New here. Hoping to learn and get some more performance or other upgrade tips for my 24 Canyon AT4X. Just got it about 2 months ago. Found this site, did a little poking around and felt like...
I suggest test driving everything and not relying on forum opinion on what's better or worse. What I like might not be what you like or need etc, unless you're looking for mechanical opinions - I...
Hello all, Just joining to hopefully learn and share about my new 2026 GMC Sierra 1500 AT4X Duramax. Decided on onyx black and will be picking it up this Saturday (7/25) after a trip to Boise...
GMC AT4X HD
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I think they all have their issues and you can get luckily or screwed. I have very much enjoyed my 2024 AT4X HD gasser however. Did not need diesel power but needed the payload and longer bed...
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This thing is still bouncing around in my head. I’m fighting the YOLO justification and the sensible adult with more important things to do with $600 (I mean, I really want one of the gen 6...
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Showing off some suspension articulation and having a great time on a trail run in NH with Ridgeback Guide Service. AT4 earning it's badge.
Button delivered. Supposedly adding a corvette push to start button adds 29 horsepower to the Duramax! 🤣 We'll see. Kinda think it's over hyped like cai's. Anyway, it feels...
I'm a classic truck lover, have a '72 C10 stepside (has a '69 grill). But this is a little tacky to me, luckily you don't open your hood often and have to keep seeing it. I...
GMC 1500 AT4 Talk
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Wish you luck. It's almost a crapshot anymore. Kinda thinking @Truebee might have had it right. Put 40-60k into a squarebody and have something up to date and dependable, with only 3...
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I am honestly a bit surprised at the lack of threads in this section. This is an absolutely perfect way to document what you have done so far and bounce ideas off others for future modifications...
I got rid of the plastic splash guard and replaced it with a WC Fab aluminum one
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Looking for advice on de-raking, ride quality, and tire size on my 2026 Sierra 2500HD AT4 Duramax I recently picked up a 2026 Sierra 2500HD AT4 Duramax with the Max Trailering Package, and I’m...
GMC AT4 Talk
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I too had Wireless AA issues. My solution for now was to go into the settings on the truck and turn off "Fast Start up". It basically forces the infotainment system to reboot each time you start...
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GMC 1500 AT4 6.2L V8 engine
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I'm a classic truck lover, have a '72 C10 stepside (has a '69 grill). But this is a little tacky to me, luckily you don't open your hood often and have to keep seeing it. I think it would get old...
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GMC 1500 AT4 Talk
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So learn me something, fuel shows up in oil on diesel engines? Most definitely. Diesel requires heat to ignite, ie, high compression. Diesels will "slobber" on cold starts. And unlike a gasser...
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GMC 1500 AT4 Photos & Videos
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got it installed (only $250) so cost me around $1300 in all loud as hell probably not practical but fun
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Welcome.. how about a direct replacement fog light upgrade for the 2022.5 and up. I have a 2022.5 AT4x and there really are no good options to upgrade the stock fogs.
Just an introduction, I currently have a ZR2 Bison. I flop back and forth between GMC and Chevy over the years. Could not get a cardinal red AT4X so had to go Red Hot Bison this time. Look forward...
GMC AT4 HD Problems and Issues
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Here are some pics. I hope I found the right place to post them.
Not the best picture but I thought the history of this place was cool. Krieg Bros. Chevrolet Co. was a historic automotive dealership originally opened in 1935 in Thrall...
I installed the Chassis unlimited pro light series front bumper with 12,000lb winch and rough country 30” light bar
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Everyone seemed to like it in the patriotic trucks thread so I’ll try it here… Enjoying America’s birthday on the beach:
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Hello Everyone! My name is Bill and I live just a little south of Chicago. I am proud to say I finally got my first truck, a 2022 GMC Canyon AT4 in Onyx Black. I purchased it in January with 26K...
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Here we are at Brooke Lake in the Bridger Tetons outside of Dubois, WY. Might have to change my profile pic. Think GMC would let me be a location scout for their photo shoots? Or is AI going to...
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GMC AT4 HD Problems and Issues
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It's not hard to add one. I put it in the space just ahead of the brake controller. You are not wrong. For what these trucks cost though, they should have a port in the front and back passenger...
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GMC AT4 Talk
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Does your phone connect via android auto if you plug your phone in with a usb-c cable? If it connects, then it's probably a bluetooth issue. If it doesn't connect, then it's probably an android...
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GMC AT4 HD Problems and Issues
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Have a 2025 2500 AT4. This is my fourth diesel, bought it Dec 23, 2024, and very happy with it. Other diesels I've owned were a 2010 3500 HD, a 292 Cummins 855, and a 2016 Powerstroke. The...
A $30 can of carnauba and some elbow grease will last longer and not take off your clear coat. Spending thousands is just stupid. And it will not last more than a few months regardless of how...
What’s going on everyone! I’ve had my 2022 AT4 Canyon for about 2 years now. Love the way it drives and it’s my first truck. Look forward to seeing some upgrade possibilities to make it even better.
My first Duramax and my first diesel 2026 At4 2500 HD Coastal Dune I'm looking forward to discussions on different modifications and upgrades. Right now, I am looking into fog/driving light...
Just landed in Yellowstone! Took this picture in Colorado a few days ago showing the rig. I lifted the airstream 3” to keep the belly away from any more road alligators.
With the 250th of our great nation coming up lets see your patriotic truck pics!
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GMC AT4 Introductions
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I just purchased a new 2026 HD AT4 Gasser to be the tow vehicle for our Airstream. I test drove all the brands and the AT4 stood out the most. Retired military and new to the forum. Phil
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Figured I'd finally introduce myself. I'm new to forums in general, so this is all new to me. I picked up a new 2025 Sierra 2500HD AT4 late last year and have put about 20k miles on it so far...
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Another great weekend, this time up in Cherokee NC. Decided after this trip a restroom tent was in order so I have one on the way for next time.
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Congratulations to @ATXAT4 on winning the June 2026 AT4 of the Month contest! Great shot and caption! “When the forecast matches the paint code — and the trail matches the truck. Thunderstorm...
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Factory OEM upfitter switches would be the cleanest looking install. Honestly with the push buttons on the door handles, a ford style keypad is just that, a ford dimly lit bulb idea. You just...
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Sunroof? Who needs a sunroof. That’s what these are for.
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If that's supposed to be me, I think you missed the point. Everyone likes their truck a little different. Stock, leveled, lifted, slammed, big wheels, large tires, etc. I was just jokingly...
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GMC AT4 HD Problems and Issues
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Weird question. 2025 AT4 The usb c ports charge my phone and power/charge the gps, so do the usb a ports.... The usb a ports power/charge my Garmin RV gps and turn on my furrion vision s...
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I have had my 2024 AT4 for just over 2 years with just over 18k miles. Just got back from over a 600 mile round trip over the weekend. Filled up before coming back but I had a thought of driving back without filling up but wanted to...
Not a fan.. the exterior looks more like the electric truck (gross) than a "real" truck. Driver side air vents and spacing just look off, added screen on the passenger side is...
Ranch Hand Summit on 1500 3.0. Rear Bumper coming in few weeks. I drive into pits to inspect MSHA sites for my company and inspect concrete plants for OSHA hazards. Had...
GMC AT4 Talk
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I ceramic coat my plastic trim, fender flairs, windshield cowl plastic, bed rails, and bed cover. Most ceramic coats have UV protection and work well on plastic as well as painted surfaces. Works...
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GMC AT4 News
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Glad I got one in 2025. Lookin less and less like a real truck. I want less tech. Less to break. Id take manual roll up windows if they had em.
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I purchased a 2025 Sierra 2500 HD with 12,000 mi. Beautiful truck. Within 2 weeks the engine blew up while on the road . Oil & antifreeze mixed and fully coated the entire engine bay . Had to be...
GMC 1500 AT4 Talk
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Happy Father’s Day to all the wonderful members here (you are all wonderful).
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GMC AT4 Camping & Traveling
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Thanks Flipper. This is what I hear from others with trailers/RVs, Three to four weeks appears the most, folk can bear to live and travel in an rv/trailer. Its great if you have a spouse who...
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GMC AT4 News
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https://www.gm-trucks.com/next-gen-2027-gmc-sierra-1500-v8-trim-changes/ Wonder what the 2500hd AT4X AEV would have. Having said that, I may already be on my last vehicle/truck for life. Ya...
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GMC AT4 News
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I like my technology but I like the look of a "truck" not a car on steroids. Want to mix old school with technology, yes im weird lol. But being that they are phasing out android and car play it...
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GMC AT4 News
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Glad I got one in 2025. Lookin less and less like a real truck. I want less tech. Less to break. Id take manual roll up windows if they had em. Agree there. But hard to find older models and I...
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For the ones that don't live by truckstops... The date code on the jugs box will tell you when it will "expire". Once you understand the secret squirrel code it's easy to decipher. Here is a...
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I figured I'd share my current SmartCap build on my 2025 Sierra 2500HD AT4. The first project was building a roof rack using black TNutz aluminum extrusion mounted to the SmartCap rails. I wanted a very low-profile look and honestly...
Well, I didn’t really do it, and it wasn’t actually today, but I had the entire Wehrli Fabrication suite installed. You definitely hear the turbo more, and I love the way it looks.
Built a little mount out of ABS for my Garmin Power Switch and Blue Sea Bus Bar. Took advantage of the space behind the passenger headlight. Right by the battery.
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Just picked up a new Brinkley Model Z 3610. And no, I don't pull it with the 1/2 ton lol.
2026 Rockwood 8339FK Signature. Currently on its shake down trip...
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A Grand Design 2500RL Two weeks back from our first big trip ….. between 5-6 thousand miles
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GMC 1500 AT4 Problems and Issues
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That's it? No paint damage, no broken glass? That's it? No punctured condenser/radiator? That's it? I would have all of the above plus deer shit to clean off.
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GMC AT4 Introductions
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Don’t put DEF in the diesel. I know too many guys and gals that have made that costly mistake! lol Welcome!
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:( No nothing to report here! I was so active on mods here, and now nothing. Everything about my truck, unfinished projects, parts accessories is packed and in storage until after we relocate to...
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GMC AT4 Talk
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I did my ceramic coating myself as well and used Adam's Polishes Advanced Graphine Coating. I got the truck SUPER clean but didn't have anything to do correction. That said, the paint looked...
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GMC AT4 Talk
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Jayco JayFlight, 33’ 262RLS W/ 2026, 3500 AT4 Colorado mountains - Divide, CO
