BuckWallace

I have about 27k on my 2024 with the L8T and 10sp and haven't had any issues so far.

This happened to me with my gasser on the 2nd "free" oil change. Stupidly I never checked the dipstick and when I changed the oil next myself I drained out 10 quarts (Duramax spec). I, too, thought they put the wrong oil in so I sent a sample in to Blackstone, but luckily they confirmed it was 5W-30. I'm assuming the oil change "tech" saw an HD truck and just did the "standard" 10 quarts.

What gives you the impression it's not a reliable engine? Honest question.

Other than the ride comfort and fuel mileage I don't think you'll regret your 2500! If you're on level ground doing ~60 you can definitely get 17, but anything over 65 and the mpg suffers. I'm definitely jealous of your $3/gallon. Here in Oregon it's $4.70 at Costco (generally the cheapest for top tier)—I put in 28 gallons today and it cost me over $130...

Yes.

I have this one as well—works great.

The only concern might be the pin weight on that 5th wheel. Some 2500s don't have a very high max pin weight, so that could be the limiting factor. Also, your L8T can handle the overall GVWR, but if you're towing that much very frequently your quality of life (towing) would be much more pleasant with a diesel. Good luck with whatever you choose!

Was this created by GM?! Just kidding, but this is interesting. I change my oil every 5k miles or 6 months (I don't put a ton of miles on my truck), and I hadn't had any noticeable consumption on my 2024 L8T until this last oil change at a little under 25k miles. This OCI was about 4500 miles and I lost about 1/2-3/4 of a quart, so well within this "normal" consumption range. I was a little bummed to see that much gone since I hadn't noticed any loss before, but I'm not going to worry too much about it.

Even with the hit on selling/trading in, you're almost certainly better off just doing that and buying a dually.

I would think the reaction gearset noise (which is what I believe the noise I'm referring to is) shouldn't be heard in park. Only in the gears mentioned in the TSB.

Yes, the new one is definitely shaking way less.

Ha, I had my driver side mirror replaced last year due to excessive shaking (sounds like another common issue). It, too, closes slower than the passenger side, but maybe only by ~1 second. Hopefully the parts lottery is kind to you this time.

Yes, I believe it's TSB 24-NA-262. I'm with you on not messing with it if a replacement isn't going to get rid of the noise. If mine were performing differently or getting worse I'd definitely bring it up, but it's still driving great so I don't want to mess with it. I'll probably at least bring it up to the dealer before I'm out of powertrain warranty, but for now I'm just going to keep enjoying the truck!

Keep us posted. My 2024 gasser has had the "whine" in gears ~3-6 since new. It hasn't gotten any worse and still shifts totally normal, so I haven't made a big deal about it to the dealer. GM-techlink says the following about the 10L80, so I wonder if it's a similar normal sound from the 10L1000s: Reaction Gearset Whine A whine from the reaction planetary gearset may be heard during light to moderate driving conditions, especially when the reaction gearset is in 4th or 5th gear (20-35 MPH) (32-56 KM/H). (Fig. 19) The frequency of the whine will change as the transmission shifts gears due to component rotation speeds changing. Use the manual tap shift feature to shift through the gears to verify which gears have a whine sound present. TIP: A whine sound from the reaction gearset should not be present in 7th gear due to the 1:1 ratio and the gears being locked. If a whine is present in 7th gear, check other components.

That's a good point regarding max tongue weight on the half tons. Mine loaded is around 850.

Yes, the specific Elevation I checked has a payload of 1,631, which I was pleasantly surprised with. My 2010 Tundra's payload was about 1,300, so the Elevation would definitely have given us some more capacity. Overall, I can totally see myself regretting getting rid of the L8T. It's so relatively simple compared to all the engines in the modern half tons and I'm sure it'll give me much more peace of mind in the future. I did run numbers on the initial cost + insurance - fuel savings and it would take me a fair amount of time to break even on getting a cheap (even sub $5k) commuter car. There's also the consideration of added mileage and wear-and-tear on the truck if I'm commuting in it, but I'm not super worried about that.

When I test drove HDs I couldn't tell much of a difference between the 2500 and 3500, so I just went with the 3500 since it wasn't much more (also no difference in registration in my state). Honestly, the ride really isn't that bad unless the roads are bad. I also recently upgraded to monotube shocks, which definitely provide a more "compliant" feel, especially over bigger bumps.

Alright y'all, I need some advice here. Back in 2023 I sold my trusty 2010 Tundra and bought a new 2024 Sierra AT4 3500 with the 6.6 L8T gas engine. We had just bought a larger trailer and needed the extra payload. Our trailer isn't super huge (27', 6500lbs) and we only tow 5-6 trips per year, but it has a higher tongue weight for a trailer that size and by the time we loaded our family and gear in the bed we were well over the Tundra's payload. At the time I was still working from home full time and we always drove our Highlander if we went anywhere as a family, so the huge, gas guzzling truck wasn't a concern. My company forced us back into the office last year and I'm now commuting 3x per week (about 50 miles round trip) and the fuel costs are starting to get to me. That, coupled with the relatively unpleasant ride of the 3500, is causing me to conisder selling it and getting into a 3.0 diesel. The payload on an Elevation diesel will be enough if we load carefully and I calculated the fuel savings to be about $1200/yr (even considering the average cost for diesel in my area). Between trading my gasser in or selling it and buying an Elevation diesel, I'll be pocketing about $6-10k and getting a brand new truck (albeit a lesser trim than I have now, but I don't really care). All that said, my gasser hasn't given me any real issues and I know it will likely be less of a headache in the long run vs a modern diesel. Am I crazy for wanting to get back into a half ton?

I'm also in Oregon, so I feel you!

On the way into work this morning, the wipers briefly stopped (2-3 seconds) and my headlights flashed on my 2024 Sierra 3500. I've noticed the wipers briefly stop before and didn't think anything of it, but it's always been during the day and I never noticed the headlights flashing. Anyone else experience this? Wondering if it's just a grounding/battery issue or potentially something with some sort of controller...

Sheesh, was that shop quoting 15 hours of labor?!

I think the 98% is accurate if you're describing people who think they actually have an Allison transmission. Most people don't research everything to death on the internet and probably think if a manufacturer says "Allison transmission" then it's an Allison transmission rather than "hey, I better go research this to make sure it's actually an Allison".

Well I'm glad I still have a cool Allison badge while all the suckers who buy after December will just get a plain ole GM transmission.

I'm somewhat similar to you in that I tend to read stuff online and over-worry about things. As I've gotten older, I've learned to either stop reading vehicle and health-related stuff online or take it with a grain of salt. You're going to hear the worst from the relatively-few people that come online to complain, while conversely not hear a thing from the thousands of people without any issues. Of course it's going to look like the ratio of issues to no issues is high, but in reality it's the opposite. I understand your feeling, though. That said, I only have ~22k miles on my 2024 gasser 3500, but I haven't had a single issue with the powertrain. There have been a few other minor things the dealer has taken care of (infotainment was one of them), but otherwise this has been the best truck I've ever owned. Anyway, I'd just say to enjoy your truck and only worry about any issues as they arise.

I think your post above of "A quick search Mobile 1 price I would buy Amsoil oil" could be read one of two ways: 1) Mobil 1 is still so expensive you'd rather just spend the money on Amsoil (this is how I read it). 2) Mobil 1 is cheap and therefore inferior (I can maybe see this based on your follow-up post). Either way, based on you saying that you buy Amsoil because it's a good product, the comment on Mobil 1's price seems irrelevant unless you meant it's cheap and therefore bad.