GMC AT4X 2500 HD 100 mile Review

Got a surprise call Monday that my truck was in, which was interesting because it was built on the 6th of January and wasn't scheduled for delivery until March/April.

Anyway, went and swapped my 2021 Ford Lariat Tremor for a 2024 AT4X 2500.

I've had GM products off and on, my wife has had a couple of Tahoe's and Suburban's and is currently in a GM SUV, I've had a 1500 Chevy and one son drives the same currently. Decided to give GMC a try as I wasn't all that thrilled with the "updated' 3/4 ton trucks Ford is putting out, and compared to the GMC, the Chevy version is, Imo not up to the same level of aesthetics as its cousin.

Waffled back and forth between the AT4 and the AT4X, eventually decided to go all out and get the X.

It just turned 100 miles on the ODO and wanted to write up a initial review for those who are or may be looking in the near future.


Exterior Appearance: The truck has a very bold stance. Much more so than a standard 2500 HD in any trim, even the AT4. It comes equipped with the metric equivalent of 35x12" Goodyear all terrain tires, which is noticeably wider than the Tremors 35x11" tires they are equipped with. They say it has a factory 1.5" lift, but I question that as it sits so much higher than the other 2500 Models. One thing I always loved about Ford was the tall ride height of the 3/4 tons, most GM products are low to the ground, even the 4-wheel drive models. They got it right with this truck. Bedliner came sprayed from the factory. I ordered this truck with a gooseneck prep package, which came drilled from the factory with 4 holes plus the ball mount for a gooseneck or 5th wheel towing.
Front end does not have a low hanging Air Dam ( truck does not have one at all ) so it has that beat over the Ford Tremor (even though the Air Dam on the Tremor is shortened). I prefer the look of the stock front end of the GMC over all others ( Ford, Chevy, Dodge) but as soon as they are released from Ranch Hand, its getting a Summit Series front and rear replacement.


Interior: - Very nice interior- Unique leather seats and trim, its more edgy than the Denali although it's an equivalent trim level. Prefer the screen and dash controls over the Ford, although generous enough, it does not have the center compartment space or deep console storage the Ford has. It also does not have the bottom door storage that the Ford has. Its adequate, but I live out of my truck most days and prefer to have the storage space at the expense of cupholders and small compartments for my day-to-day items I carry around. I'm not an engineer, some misses Imo are the poor placement of both the Ignition button ( its now part of the center dash control cluster instead of bottom right of steering column) and the extremely poor placement of the trailer brake controller. It's just below the center console next to the cupholder, if it was placed on either side of the steering column, where it is with every other truck, there would be room for additional console/cupholder storage. If you used it every day in a live action setting, it would be perfectly placed, but not for a feature that you set once every so often and then forget about. Back seat is roomy and although not quite as big as Ford, it's certainly big enough for 3 adults. Headspace also got a boost with a recessed ceiling. Back seats sit a little higher than the Ford for better visibility; I ordered a under seat storage that comes with a removable lid, I decided to forgo the lid for a while and keep it open. The storage box appears to be a little narrower, but when i filled it with the same contents, it actually has more room due to it being deeper than the Ford. There are also storage compartments INSIDE the center of the back of the rear seats where you can store small items, tools, etc. that you would want easier access to. Big win here for GMC. Everything else its on par with the competition; both have heated/cooled front seats, heated rears, etc. I do wish GM would have a true selectable auto feature for the headlights, so you don't have to turn them off every time you got into the truck.

Driveability & Performance-This one surprised me. I've never spent much time behind the wheel of a Duramax, the last one I drove was in 2016 and was, lets say, less than impressive. I've owned a number of diesel trucks and my family had them going back to the Mid 90's, so I'm no stranger to Ford Diesels. I started this one up and immediately noticed how quiet it is. Standing outside, you can barely hear it running. Inside the truck, it's almost imperceptible at an idle. I'm approaching 40, I'm way past wanting a loud vehicle, so I appreciate the low decibel level. Put it in drive and take off, the truck runs smooth with almost zero turbo lag. For people who remember driving stock 7.3's and 5.9's, you know all about the lag. Every year model they have gotten a little bit better, but with this truck it's pretty much non-existent, which was my original complaint with the Duramax in 2016. Truck accelerates to speed effortlessly. The gear shifts are seamless and butter smooth, which they were not with either the 6 speed or 10 speed Ford. Ford was smooth, but this almost feels like the truck has a CVT tranny and not 10 gears. Driving at highway speeds, truck stays planted and does not wander. I have not gotten thru break in so my accelerations have been gentle, but this truck does not seem to have the same de-tune settings in 1st, 2nd and 3rd like my last Ford with plenty of USEABLE power down low. There were times in my Ford where i would mash the gas and the truck would barely move until it figured out I was trying to go somewhere and then would launch. The Ford beats it by a good margin in numbers (475 hp/1200ft. lbs vs. 470 hp/970 ft. lbs) , but I don't think at these power levels if you can really tell a difference. Ride quality is AMAZING. Think rides like a half ton. Turning radius is much improved over previous year model GMs. The AT4X has DSSV multimatic spool dampers that claim to deliver a smooth ride on and off the road, I won't take it off road until tomorrow but the on-road ride quality is much, much better than my Tremor, which was pretty dang good in its own right compared to the FX4. I was hoping for and needing a good ride and so far, this one delivers. Fuel economy isn't in yet as I've only done some light highway and driving on rural backroads but will report back tomorrow.


Some other items of importance- Few other differences that are of notable mention is this truck is a smidge wider, a smidge taller and about 4" longer than the Ford F-250 with the standard bed. This translates into a slightly longer and deeper bed. Fuel capacity is also greater, this one featuring a 36 gallon fuel tank. Although for what I do, an overall bigger truck is more of a negative than a positive, it's a trade-off that has its pro's in relation to the cons.


Things the Jury is out on- Durability is the main one. The solid axle Ford is a tough truck. By design, an IFS system, especially with a diesel, isn't as stout as a live axle, but is it stout enough to endure many, many miles of rough, rocky ranch roads, washboard caliche roads and cracked and pothole filled pavement? Only time will tell. One thing I will say, is that I think GM is missing the boat on not having a front limited slip/locker in this truck. Its standard feature in the half ton, but I'm a believer in how much of a difference it makes after driving the Tremor off road. It's a game changer. The Tremor, off road, was hands down the best 3/4 ton truck I've ever been in, much improved over the 17' FX4 I was in before. With those skinny pizza cutter M/T's and the limited slip, it would crawl up hills and go thru muddy washes like no other. I had a lot of confidence in it off road once the conditions got bad. While not an apples to apples set up, I hope the AT4X performs close to the same. No questions this rig will be more comfortable, only question is will it hold up.


The Final Takeaway- GM has produced probably the most Badassed Heavy Duty truck on the market in terms of looks and comfort. I'm hoping its not all hat and no cattle. Ford has some, I'll say more practical features both inside and out but its wrapped in a ugly and i dare say outdated design. I was not as thrilled with the Ford this last go around due to some issues with the truck , which in large part prompted my shift of brands. For anyone in the market, give the GM 1/2 ton or 3/4 ton platform a look. I'm sure you will be as impressed as I was.

Really nice and thorough review. I hope you enjoy the new truck and don’t get it scratched up too soon !

What issues did you have with the previous Ford?

Electric and transmission issues. Truck would slam gears shifting from 6-7th. Not every time but probably about 1 in 30 shifts. One time it did it so hard I’m shocked it didn’t snap a U-joint.

During the freeze a few weeks back, I had it plugged in to the heater in the driveway. Started it up and let it idle for about 10-15 min then got in, put it on reverse and….nothing. Put it in drive and it wouldn’t go anywhere. I gradually got it up to around 3000 rpm and it SLOWLY started to inch forward until I got it back into my driveway. Figured that was all she wrote for the granny and went back inside. Next day, started it again in the same weather conditions and it drove fine.

Other times, mostly while towing a trailer, it would flash and say there was a DEF malfunction and speed would be limited to 50 mph in 50 miles. Most of the time it would turn off within 5-7 miles but sometimes it stayed on for 30+. I took a trip to Alabama over the summer and thought it was gonna strand me and my son on the side of the road with the boat in BFE Mississippi.


I’m not holding it against Ford, a lot of it had to do with the lack up updates to the body style and interior ( I’ve already had two identical Superduty’s and didn’t really want a 3rd one ) but the last truck didn’t instill a lot of confidence in me once it got to about 80k miles

We sold a few. Odd how many people can afford a six digit 2500 out here away from DFW. Guess it's business from anywhere if you got what someone is looking for...

That’s the exact truck I’ve been looking at. The fuel mileage I’ve been hearing is dismal, most reporting 16 MPG on the highway. For a truck, even though it’s a big heavy truck, you would think that 10 speed would do better. I’ve been eyeing the Tremor also, as I need a better off road truck than my current Ram. But, in the end, my Ram is still a reliable truck that been paid off for 6 years and the thought of a $95,000 truck purchase turns my stomach. I keep my trucks for 10+ years, so durability is important

My Tremor wound up getting 16-17mpg on the highway.

When I got it, it would get 20-21 on a flat stretch doing 75 but that quickly went away. It would get 20 doing about 65 mph but I can’t drive that slow.

This truck has a bit less than 500 miles on it now and I’m getting around 16 mpg….about what the tremor did

The new Super Duty my 23 3.31 gears and a 10 speed I am averaging 20 city highway combined. My 2017 was 16. This 23 Highway consistent 25. That’s driving with the speed of traffic.

18,000 miles on her now.

On your truck, the pick up bed is too small. I like the color, but still cannot get over the square fender wells and the teenage braces grill. There is a reason that there are different varieties. Not everyone will like the same look. The Ford is more classy and the GM is rugged, imo.

Go look at a Denali, or Delia Ultimate, those are seriously nice.

I average 18.5, that’s 80mph on the highway

Im impressed with the multimatic shocks. Buddy as a 1500 at4x.


Becareful though. The doors are aluminum

With the smaller 34” Michelin street treads, the 3:31 gears and a stock front end, I’m not surprised at 20 mpg highway. But the same truck with 3:55 gears, front and rear replacement bumpers a 35” A/T’s or M/T’s, you’re gonna be lower. 130k on my tremor when I traded it and the lifetime average was 16 mpg. This was a mix of unloaded highway driving, dragging a trailer thru the hills at 70-80 mph and crawling down rough two tracks.

The Ford, by design, is more ruggedly built due to the straight front axle. The interior of the Denali trims ( which this is a variant) is more luxury than the more utilitarian trim of the Fords, even the King Ranches and Platinums. This truck is the equivalent of a Platinum with the Tremor package.

On the bed…there is 4 cu.ft more space in this bed vs. the superduty swb. It’s a few inches longer and deeper. The baby beds you’re thinking of comes on the 1/2 tons. And the front end of the new fords looks like a flathead catfish going down the road.

The 2017 and up Fords are aluminum too. Look at it hard enough they dent.

Pig,

Cummins 6 cyl always seemed to get better mileage than the V-8’s. I do remember the original D-Maxes would get 21-22 mpg ( pre def) but they wouldn’t pull a door closed.

Reliability wise, I can’t say what you’ll be better off going with. This last truck had issues that would imo have prevented it from being a 10 year ride. My 17 probably would have been, aside from an oil leak that was common for that year model, thing ran great. Had 164k on it when I traded it out, but ran like a top.

The Rams in a 3/4 ton platform ride too rough for me to consider them for what I do, but they have probsbly the nicest interior of them all in the Limited Longhorn. That truck price wise is gonna run neck and neck with the others though.

To replicate my last truck it was gonna cost $88k. $95k if I moved into the King ranch or platinum. The Laramie longhorn was $93k. Trucks are just outrageous these days.

How was the trade in value of the Tremor?

The used market has softened quite a bit from 2 years ago. They gave me $40k for it. Actually took it to 3 different places and this was the highest.

One thing I will tell you is, I don’t believe the upfront cost of the tremor package equates to an equal value on the back end of a trade. May make a difference during a private party transaction, but the dealerships don’t seem to factor it in.

I found a 2024 Ram 2500 Limited Mega Cab listed for $80,500, really piqued my interest in a new vehicle. I’d have to send it off to get an electric locker in the rear though. That’s the only reason for looking at the Tremor or AT4X. I could add a locker to my current truck and just keep on rolling to 300,000 miles.

I’m too cheap to buy myself anything, so I’ll probably keep rolling the Beached Whale for a while.

$80k is a hell of a deal.

Just built a Limited Longhorn Crew Cab online with the same specs ( as much a possible ) as the AT4X and it was $97k

Mine has a rear locker, Lariat Ultimate.

Ram has them in the new Rebel 2500 but it looks like Judd.

That is one nice truck! I’m working cattle this weekend; I say drive that thing up here and let’s break it in!

Friend of mine sent me this today.



Thought it was funny. I was driving in Dallas today and your exact truck pulled next to mine at a light and the front end was taller than mine. It looked nice. Not enough for me to swap, but still nice.

Yeah but that’s a Chevy, undoubtedly the ugliest of the HD trucks

The Chevy is a pretty ugly truck. I looked at a 2500 ZR2, it's pretty much a different truck that has similar features, the days of Chevy and GMC being the same with a couple of minor variations are gone. The interior is very different, the GMC has different headlights, grill, Bumper, etc. Price difference is about $8k.

The only thing I like about the Chevy version better than the GMC is the location of the trailer brake control and the cupholder/front tray. GMC could have done better in that department.

1500 mile review ( actually 1871 miles) :

Spent some time in the truck this past week, both on the highway and off pavement. Truck rides like a dream and handles nasty caliche roads like a champ. Because it’s so smooth I find myself driving faster on ranch roads, which has led to a few unexpected surprises when I hit a hog root or hole in the road. On the highway it’s like riding on a cloud.

I haven’t really got on the pedal too hard yet, but did have to accelerate quick one time to avoid a truck and the getup and go is there from a slow roll, at highway speeds accelerating is effortless.

Fuel mileage is fair, not great but not bad either. Considering the height of the truck and the tire size, it’s more or less a lateral from the other trucks I’ve owned that were similarly equipped. I’m getting around 15-16mpg on the highway with small towns and stops mixed in. Best I’ve gotten is 18mpg on a flat farm to market road.

Only thing I’ve towed so far is an empty 16’ flatbed pipe trailer. It’s not heavy @ 2600 lbs but you can feel it back there. It didn’t seem to pull quite as well as the Ford, but it does have a slightly higher gear ratio ( 3:42 vs. 3:55 ) so this may account for the difference. Will probably hook it up to a heavier load on the next week or so.


So far, been real impressed with the ride quality on and off road. Been a real game changer

That is a great looking truck. My wife has a new Denali and loves it, but I hate the GMC seats, the last two I have owned are the least comfortable seats I've ever ridden in.

They take some getting used to as they are much firmer than what you would think.

But, on longer drives, which I do every day, I find them more comfortable. Kinda of like a firm mattress, they are not inviting at first, but you get better sleep

I have a 2020 AT4. I have not heard of AT4X. What is different on an AT4X?

Different interior, different bumpers, different wheels/tires, multimatic DSSV spool dampers ( shocks) different ride height…basically it’s a Denali where they took out all the chrome and old man accoutrements and replaced it with more rugged off road geared options

Ok thanks for the info. Looks like all useful stuff added. I learned something today

also at4x aev edition= boron bumpers and excessive boron skid plates

They also have different upper/lower control arms and steering components. Supposed to be before for more off road use. Visually they look significantly stouter. IMO the IFS system was always a weak point with GM but we will see

They had an AEV edition on the lot. Looked good but for another $10k I decided to pass. A little to “bro” for me

heavy!! Think it has like 600lbs in skid plates. I could be wrong but pretty sure that's what I read

The AEV curb weight is somewhere around 8600 lbs....It does have steel bumpers but they can't be that heavy.

The Duramax used to be considerably lighter than the Ford but now the curb weights are about the same....I think the Ford Tremor is 7900# and the Duramax right around 8k. Listed specs are 7300# vs. 7700#......the AEV curb weight is 8600#....its a heavy SOB



Read an article in a Truck magazine that had a 0-60 time in the high output Diesel vs. the Duramax vs. the Dodge Cummins. Despite the considerable power difference, the Ford H.O only beat the GM by .3 seconds- 6.3 vs. 6.6 seconds. The Cummins hit 60 mpg after 8.1 seconds....considerably slower. The 7.3 Godzilla beat the Cummins by almost a full second. The Duramax did beat the standard option Powerstroke in the 0-60 times.

I’ve never needed to get my truck to 60mph in 6 seconds, not really sure why that’s even a notable stat for these trucks. That being said, my powerstroke was definitely faster than my Cummins, but the Powerstroke fell on its face when we had the boat or camper hooked up, but the Cummins never seemed to notice. Of course my Powerstroke was the hated 6.4 and not the newer 6.7, so that may very well have a lot to do with it.

How’s the AT4X doing?

The AT4X is very nice but I too do not like the AEV version as much. As a long time "person of the business", I see issues with future repairs. The whole front bumper is AFTERMARKET regardless if it's "OEM" new and some of the trim is different to match. This means in the future, you may not be able to get the bumper, its parts, or the other trim that is different from a regular AT4X. And the bumper IS that much heavier. It's thick textured steel instead of a sheet metal facade. The rear bumper is similar. The rocker guards (technically not steps) are about 3X the weight of the chrome 6" LPO steps. I know from picking up the boxes (they are dealer installed).

We have a volcanic red AT4X AEV 3.0 diesel in stock though if anyone has $80K to burn.

The stock front and rear bumpers are getting replaced with Frontier or Ranch hand replacements as soon as the manufacturers have them out. Too much liability going unprotected.

And yes, I didn't care for the AEV edition either.

The 6.4 diesel was a 700 ish ft. lbs of torque truck.not bad but nothing like what we have available now. Cummins sort of stopped trying to keep up with the HP and Torque numbers shortly after the 6.4 came out. the H.O in the 3500 model is impressive, but the 3/4 tons don't get the H.O due to the transmission.


I'm just over 5k miles on the ODO now and overall I'm liking it. It isn't as fast as my previous two power strokes ( the tremor would really move from 40 mph to 80 mph ) but its more than adequate. Ride is unbelievably smooth....hope that does not change when I add the level and front end...been hearing conflicting reports on the level messing with the DSSV shock settings and creating a rougher ride up front. we will see. Overall, when I'm in the truck for 4-6 hours at a time, I'm not wore out like I was driving the Fords.


Only big complaint is this thing is a Diesel Hog....14-15mpg is what I'm getting, If its level and I take it easy I'll get 17-18mpg but still, not great.

I’ve never seen a Chevy do well after changing the front suspension

if you're going to level, got to change upper control arm, IMO

The AT4X has different upper and lowers. Visually, they are much beefier than the ones that come on the other 2500's.


I had a 4" lift put on my 1500 in 2015. Changed the Control arms , but that didn't fix anythig. Wore out 3 sets in 80k.

Thats why I'm just wanting a level to take out the slight rake, now it's not all that noticeable but with the front replacement its going to be too much Imo.

Well, just found out that you cannot level an AT4X 2500. The shocks have certain settings that if exceed a certain height it will cause failure with the DSSV dampers. Basically, the AT4X is already lifted in the front ( and it is) and has enveloped all the ride height the shocks/control arms will allow. This is per ReadyLift, they are working on a level system right not but have not come out with one.


So....we are now looking at doing a reverse level in where we change the rear blocks to ones that are 1/2 " lower than the factory blocks. To be honest I wouldn't mind it being a little lower, its taller than my Ford in the rear and makes getting into it a pain, even pulling a trailer I really need to get longer drop hitches.

just get a dirtbox draw system and puts some tools in it

Last thing I want is more weight in that big bish

still a 3/4 ton truck, will ride better with a little weight back there. Put cool stuff like drones, air compressors, plug kit, etc

these even have built in slide for coolers etc.

https://dirtboxoverland.com/pages/truck-bed-drawer-system-info

I’ve been keeping my welder in my new one to help it ride better until we build a bed for it

And it makes me look like a pipeliner

Thought about a box system but then I would't be able to put 25-30 bags of feed in the bed, nor my water tote.

It rides surprisingly well for a 3/4 ton. Much better than my son's F-150 with a lift and 35's

That’s a nice set up and a lot more useful than the Decked system. I really like how they incorporated the slider into the unit instead of an add on

The problem is not Chevy it's the chinese parts the kits have in them. The upper ball joints on lift kits are trash, at least the ones I have seen. I am a stock kinda guy anyway ... mostly because aftermarket is a nightmare to repair.

Even the stock chevys end up making all kinds of noise after living on county roads. IFS on heavy trucks is asking for it

Correct ... after about 200K miles. What should the mileage be before moving parts wear?

I have another non Chevy diesel that has 243k and I’ve never touched the front end so I guess the standards are just lower for some brands

all depends on the Truck. I had two Fords that were for all intents and purposes identical. One had to have some front end work done around 130k miles, the other didn't need to have any. Lived pretty much identical lives. Seen several Dodges need some front end work done around 80k. Others that didn't


I agree that I'm suspect of a IFS system on a 3/4 ton or larger truck and a straight axle setup is superior to a IFS in terms of strength but comes at the expense of ride and articulation.


We will see if the beefier control arms and other components on this truck hold up.

I'm on order for a 3500, and have a favor to ask.

I'm gathering my measurements to see how much (hopefully I get real lucky) I need to modify the gate and carport.

GMC says width w/o mirrors is 81.85". Can you confirm which measurement that is; truck body only or with mirrors folded? And then an actual width with mirrors out normal driving?

Thanks in advance!

I just turned 340k miles on my 2016 3500 Silverado. Front and rear end are still 100% factory, drivetrain 100% factory. Not been touched yet and still rides and drives nice. Truck is a work truck and is used as such - towing and loaded. I also live rural and many miles on gravel.

Actually went into the dealer this afternoon to look around. Truck has been great and owes me nothing but starting to get paranoid as i often do work for gold mines that require driving sometimes 300 miles off the grid at -30 to -40 temps. Feel like i might be pushing it. Truck craps out in the bush 200 miles from anywhere and it's winter it is serious. I always have enough provisions to survive 2 or 3 days at the minimum - but still would not be fun. Even with that many miles they took it for a test drive and offered me 10K for it today.

If i buy another it will be my last. 59 now and figure another 5 years and i am out. At that point gonna buy me an old fully restored and done up FJ - perfect machine for overlanding with an off-road camper.

OP - thanks for the review. Was your post that tipped the scales and moved me to visit the dealer this afternoon.

Yes, I'll measure and get back to you

If it helps someone make a more informed decision, it accomplished what I was intending. I try to be as non-biased as possible.

Glad to hear you got that good of service out of your rig....I was wondering what your driving conditions were like. I've only been to Canada once, those guys were big on Toyota and didn't see too many diesels where I was at in Newfoundland.


My driving conditions may be similar to yours....long stretches of highway at high speed followed by many miles of graded gravel roads and then two-track roads. Needless to say, I'm hard on a truck and use them as they (claim) they are designed for. I don't tow super heavy but my boat and tractor are a bit heavier than what I would be comfortable towing them at highway speeds with a half ton.

Yes sounds like our driving habits/routines are similar. I generally don't give a rip about scratches and dings as it is a work truck and shyte happens. I am though meticulous where things mechanical are concerned and my OCD devotion to proactive maintenance shows in the miles I get out of my vehicles. My 2016 with 340k miles is still running on the factory injectors the truck shipped with.

I went back to the dealer this morning and pulled the trigger. I know your review was based on a GMC AT4X but i ended up going the Chevy ZR2 route. Not quite as refined per say but the same in terms of capability and ride quality. I think the ZR2 has slightly larger tires at 35 inches vs 33 inches on the AT4x due to differences in the wheel well designs. Pick it up Thursday and planning to take it on a 1000 mile road trip off-grid after easter pulling the snowmobiles to get into some way off-grid ice fishing with my nephew - kid is strangely more of a chip off my block than his old man's.

The Toyotas are quite popular here but just don't have the towing capacity or payload that i currently need - and honestly nice as a Tundra is it is almost the same price as a ZR2 2500 HD Diesel and let's be real here - it is nowhere close to the same truck in terms of - well everything. Once i retire though gonna kit myself out with an old restored FJ for overlanding. The new rig (stock photo - mine is also white and basically identical):

Congrats on the new truck Hirogen. I’ve gone back and forth with the new trucks, I want a MegaCab Cummins, but I want the off road capabilities of the Fors Tremor, Chevy ZR2, and GMC AT4X. So I’ve come to the conclusion that my 2014 Ram will be around a while longer because I can’t have exactly what I want to pay for.

Thanks, Rebel HD might be close.

Yeah but those are ugly. I’ll save my self $90,000 and just add an electric locker to the front and rear of my truck and additional skid plates. It’s already on 35’s.

IMO the Chevy has a better thought out interior, the GM engineer crapped the bed when he put the trailer brake control and push to start button where he did. Its really in a terrible location.


ZR2 and the ATX4 are mechanically identical; same tires, lift, DSSV Dampers, etc.


I'm sure you will love the truck and congratulations!

Congrats on a nice truck!!! I have a 2024 AT4 HD with the Duramax. I am currently at 24,000 miles or so. Only things I have seen so far on a few that have come through the shop are front transmission pump seals leaking and have seen a couple where the left front differential bearing will completely come apart. Last one we had customer didn't notice it was leaking before it completely blew up the front differential.

One thing I will warn you about though is these newer GM vehicle are easy to steal. They cut through the right fender liner or rip the fender molding off to get to the horn then proceed to beak into the vehicle and go after the onstar module (GPS). There are several news articles out especially in Houston about the theft of these trucks.

I ended up getting a steering wheel cable lock that attaches to the buckle, a cover protector that goes over the OBD plug and I work with a guy that keeps his remotes in a protective pouch so they can't steal the transmitter frequency.

Again congrats on one heck of a truck!!

I had one where they just reached under to rip the horn wiring loose, punched out the door lock (held in place by a plastic bracket that's easy to break just servicing the door), and unplugging the OnStar (good thing it's easy to get to with how common the module failure is). Last one came in with the BCM unplugged instead of the OnStar. Theif didn't get far. Got his instructions from YouTube I'm guessing.

txtrophy -- does your 2500 not have independent lockers up front and in the back? I got a 1500 AT4X when BigPig didn't do a good job patrolling the city and mine has both, but it sounded like from your intro like yours only has a rear locking diff.

The 2500’s only have a rear locker. That’s one thing I miss about the Tremor, it had a Torsin limited slip front diff and man did it make a difference in mud and sand.

Picked it up today. Taking it on a 1000+ mile road trip starting Sunday Morning. Some of that (+/- 80 miles will be snowy/icy sorta maintained off-grid logging roads) will let you know what i think when i get back. Pretty spring like at home but where i am headed not so much.

my man!!! beautiful truck!!

Hirogen dont play!!

thats a good looking rig...I'm sure your gonna love it

Great looking truck. I finally saw that color in person and it sure is unique.

I have not seen a ZR2 in 2500 yet.

Looking good, sir.

Finally got around to taking a pic of my whip

Nice!! Man it looks warm and green there - i am leaving on an ice fishing trip with mine Sunday morning. Different world my friend but at the end of the day i chose to be on this forum because on a per capita basis i am pretty sure Texas has more people like me then anywhere else on this planet except maybe Alaska.

Glad to see the public perception of Texas is still the same....sadly, that's probably not the case though.

Texas has changed quite a bit in the last 20 years and not really for the better. The rougher stock has largely died off and Texas has become increasingly Urban and Suburban. It's a big state and there is still some "no man's land" to be had, but between the increasingly sprawling cities and suburbs, the large population escaping those areas and settling into formerly isolated rural areas, its become crowded. Lots of expats live here from other areas and they have brought their civility and progressive values with them. Even isolated areas by and large are rich with natural resources (Oil) and even these areas are heavily populated with workers in these fields. I used to be able to hit an isolated highway and drive for 30 mins or an hour and never see another car, that is rarely the case now. The hills around where I live are now dotted with Custom Homes and its hard to find a place to pee on a backroad that you won't get run up on.

Texas is a great place to live and has a robust economy but its lacking in truly wild places and capable people are the exception, not the rule.

The “rougher stock” that I became acquainted with when I moved to the Hill Country in ‘83 have all truly died off. They were real men, and spoke their mind.

Nice ride.

So 2200 miles on the truck already. So far very happy. Included in that was a 1200 mile off-grid trip that included 50 miles of this:





To get to the trailhead here to snowmobile another 6 miles through the bush to access 225,000 acres of crazy good back lake ice-fishing:

One thing I’ve noticed is that the truck will idle around 1000 rpm if left sitting for a minute or two

Can't believe it took so long for this to be added to the programming to help us out with customers sooting up their DPFs from excessive idle time. I think what you describe is an attempt to quell such as the L5P engine doesn't have near the issues as the 2016 and previous.

I thought it was a little odd. None of my Fords did it unless it was real cold outside.

This one idles for 30-45 seconds then goes into high idle at just under 1000 rpm no matter the temp

My first 6.7, I had a high idle switch. Im at 215k on this 6.7 with no high idle and same DPF

I’m at 85k on my current 6.7, had to go in for a manual burn @ 80k. Getting the high idle occasionally now. Gonna make run to north panhandle tomorrow. Dumped a bunch of Archoil fuel additives in the tank yesterday. Hoping it helps with some more DPF cleaning.

For what it's worth, on the GM trucks when it needs to regen (which you can't see unless it's been idled too long) the best speed is about 60-65 MPH. Faster than that and the exhaust velocity is higher so it doesn't get as hot.

8700 miles on the odo now. Liking the truck, my body does not get fatigued after an all day drive like it did in the ford. Mileage isn’t great but unloaded on the highway I’ll see some 17 mpgs if hills and headwind are not terrible.

Low end power is fine, but mid range, the 40-60 mph range, when you get on it, it does not get up and go like the Ford did. The Ford took off like a rocket. This one goes but won’t put you back in your seat. Drove my buddies 2024 F-350 yesterday to make sure I wasn’t imagining it and it’s an extremely noticeable difference. Don’t know if it’s a detune computer setting because the power between it and my previous fords were about the same. That said, heaviest load I have pulled behind it is 4600 lbs and it pulls it at highway speeds no issues.

Nice! Sounds like you found what works for you.