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  • Name
    Josh
  • Location
    Ohio
  • Drives
    2021 Chevy Silverado 2500HD LT Duramax

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  1. From what I understand the OEM LED headlight assemblies aren't meant to have the lights changed, as they are supposed to last 15,000+ hours. If something does go wrong, you'd have to replace the entire assembly though.
  2. That definitely complicates the issue. It did get me curious so I randomly checked some of the various gm parts websites, like gmpartsdirect.com, and they all have that sensor in stock. If I was in your position I'd be seriously frustrated. GM owns ACDelco and can't provide the part while 3rd parties appear to have no issues keeping those same parts in stock. Plus they won't honor warranty work unless the part is sourced from GM.
  3. If I'm not mistaken, I do believe that's the ambient air temperature sensor.
  4. The HD AT4's aren't lifted like their half-ton counterparts, so the 2500 AT4 will be the same height as the Denali you test drove. The HD trucks stock height are something like 1" taller than the factory lifted half-ton AT4/Trail Boss. The ride would more than likely feel about the same between the Denali and the AT4. Something to look out for when test driving the HD trucks is to see if they have the snow plow/camper package that include the heavy duty front springs which would contribute to the harshness of the ride. I feel your pain in regards to not being able to find a 1500 with max trailering. I remember when I was looking for one the dealers typically had no idea what I was talking about or just say "oh yeah it has that" with no idea whether that was true or not. I ended up just looking in the glove box of the trucks to see if it had the NHT RPO code.
  5. Just moving up to the 2500HD will be huge in making your towing more stable/enjoyable. So either the gas or diesel will check that box for you. Given the information you've provided the gas option meets or exceeds all of your requirements. For me it was easy enough to choose the diesel option, as it simplified my traveling while towing. I'm not saying the gas option wouldn't work for me, but what I was looking for was more in line with quality of life and future potential. Traveling long distances and through mountains is tiring and stressful when towing and now it's not much more worse than driving a car. The power going up the mountain and the the exhaust brake going down are the obvious benefits; depending on the traffic you can set your cruise control and it'll manager your speed going up and down. With my Pilot RV Plus card and my fleet card from TSD Logistics/Open Roads I can pull up to any truck stop and use the commercial lanes to fuel up and top off def at cash price or less. That simplifies trip planning and having to hunt for a big enough gas station to get fuel.
  6. Leaf blower ... why hadn't I thought of that? Might have to give that a shot.
  7. Not sure why it'd need to be aftermarket unless there's a harness difference with the VYU option. If not, you can probably just order the kit yourself, part number 84731643. You could look over the GM Ufitter bulletin to see if your truck matches the installation steps. https://www.gmupfitter.com/wp-content/uploads/2021/08/UI-Bulletin-161b.pdf.
  8. You can just disassemble and replace the light yourself. I think you are looking for Part# 23444107 - Front Passenger Side External Flood Lamp.
  9. It's actually in my Duramax supplemental manual under "Fast Idle Control". It's apparently also outlined in the GM Upfitter bulletin 82f where I found that GM can add the fast idle (UF3) feature. https://www.gmupfitter.com/wp-content/uploads/2021/09/UI-Bulletin_82f.pdf
  10. The manual says "The transmission is in P (Park) or N (Neutral)", so leaving it in neutral would appear to be an option. I'd probably throw a couple of wheel chocks in place to give me a peace of mind if I went that route. Now I just need to hit up the dealer and see how much it'll cost to do add both the high idle and the auto stop disable. Maybe they'll give me a discount
  11. 3500 pounds is a light load, considering you can tow 5x more than that. Wouldn't bother with the tow/haul mode. You can still play around with the exhaust brake though. When you are using cruise control and have exhaust brake turned on, it'll automatically kick in to keep you at your set speed when going down a steep grade.
  12. Curious, does the engine still shut off after 30 minutes when the high/fast idle is activated? I've read the manual, but it doesn't provide any details outside of operating the high idle function. I'm considering having the feature added to my truck at the dealer, but having the engine shut off would be a deal breaker.
  13. I use tow/haul mode every time I'm towing heavy. Starts you off in 1st gear and changes the shift points to keep the RPM's up. If pulling a light trailer, I wouldn't even bother, as it's just going to hurt your fuel economy without providing much benefit. The exhaust brake only really shines when going down some long steep grades, like in the mountains. I've made it a habit to turn it on whenever I'm putting it in tow/haul mode and just leave it on. It doesn't hurt anything to leave it on, as it only works when necessary.
  14. I've been wondering the same thing. My '14 had the USB plugs right under the lid, which was quite handy. For now I've been using a 12v USB adapter to take care of the passengers charging needs. I tried using the 2nd front USB (USB C) port, but that just ends up taking over Carplay functionality and it was easier to get a 12v adapter than find a power only USB cable.
  15. Speed is the killer of MPG when towing. I've found that if I don't try keeping up with traffic I average 12-14 mpg on the highway towing my travel trailer of about the same weight. The worst mileage I've had was towing through the mountains and that was still 10-11 mpg. If you are relying upon your truck's display for MPG average, you might try hand calculating to see if it's just too far off. Something else to consider is how you have your rig setup. The travel trailer should set level as possible while towing. Check tire pressures on truck and trailer, low pressure can lead to poor MPG. Tire or suspension modifications definitely, such as a lift/level can set you back too. I remember replacing my truck tires with a lot more aggressive tread and I dropped about 1 MPG.
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