i am looking for a new new to me truck and wanted to ask for opinions on the new 10 speeds transmissions that come on the 24 up trucks

[Chuck FB]

17 minutes ago, lineman1234 said:

No. It is however very accurate dash vs hand calculated empty or towing.

Thanks, I've never messed around with the dash on that series to know what information the instrument cluster or the center info screen has. What I have found with this truck and might apply to GM trucks for some years now, because I have a gravity flow fuel storage tank on the farm which has a slow flow compared to a typical station fuel pump, I find the tank filling to be wildly inaccurate from one top off to the next if the trucks fuel is over 2/3 full. The trucks computer was saying one thing fairly consistent to how I drove and my mechanical fuel meter was telling me something wildly different, one trip to town it would hand calculate to fantastic mileage and the next tank horrific mileage. Just something I've never encountered with a vehicle before but for some reason this has a quirk to being filled slower than what is typical at a fuel station pump does. Of course I don't dare try to "fill" the tank as I understand the evap system would not like that and may even ruin something in the process. So me being the person that has only hand calculated all my life as no vehicle I personally owned had diddly on it to tell me what mileage it was getting, now I am dependent on the computer if filling at my farm. I guess that's called progress ... maybe ! LOL. 

[Pryme]

1 hour ago, Chuck FB said:

Thanks, I've never messed around with the dash on that series to know what information the instrument cluster or the center info screen has. What I have found with this truck and might apply to GM trucks for some years now, because I have a gravity flow fuel storage tank on the farm which has a slow flow compared to a typical station fuel pump, I find the tank filling to be wildly inaccurate from one top off to the next if the trucks fuel is over 2/3 full. The trucks computer was saying one thing fairly consistent to how I drove and my mechanical fuel meter was telling me something wildly different, one trip to town it would hand calculate to fantastic mileage and the next tank horrific mileage. Just something I've never encountered with a vehicle before but for some reason this has a quirk to being filled slower than what is typical at a fuel station pump does. Of course I don't dare try to "fill" the tank as I understand the evap system would not like that and may even ruin something in the process. So me being the person that has only hand calculated all my life as no vehicle I personally owned had diddly on it to tell me what mileage it was getting, now I am dependent on the computer if filling at my farm. I guess that's called progress ... maybe ! LOL. 

If you’re interested in fuel mileage and usage and all that, get a scangauge 3. It’s plug and play and has more information, that it pulls directly from the trucks computer, than any truck comes with from the factory. 

[Chuck FB]

43 minutes ago, Pryme said:

If you’re interested in fuel mileage and usage and all that, get a scangauge 3. It’s plug and play and has more information, that it pulls directly from the trucks computer, than any truck comes with from the factory. 

Its more about the theme of the odd quirk in how the fuel tank seems to fill with a slower flow of fuel and due to that I can't trust hand calculating which is something I had not encountered before. I'll see how it seems once I do go on a longer drive and am fuelling up at stations and hopefully then see how close the computer is to hand calculated. Just never know how much to trust a computer system. The technology/information is there in front of me as far as fuel calucations, its if its trust worth or not  in my mind, yet anyway !. 

 

Does the scangauge give information like actual engine oil temperature and pressure, true voltage output and gear position. Of course this is a global B truck so hard to say what its compatible with compared to the global A system.  

 

With this new dash it tells what the fuel mileage is between key starts but deletes itself after the engine is shut down ( again based on what a computer is telling me ) which is interesting simply because the truck is able to do an over all trip calculation as well as this point to point key cycle calculation all at the same time. I've noted that on my particular drives of about 50 miles one way to or from town, that final start and heading home I can get as good as 17.5 as long as I drive easy and keep the speed at no more than 62 ( 100 km an hour that is ). While 17.5 may not sound fantastic and again that would be pure highway driving with no headwind but a bit of hills and everyone else blowing past me like I'm going backwards, trucks from many years back that were lower and lighter would never think of getting that sort of fuel mileage being driven easy, fast ratio gearing in top gear and engine refinements have certainly made a difference. 

 

 

[lineman1234]

10 hours ago, Chuck FB said:

Thanks, I've never messed around with the dash on that series to know what information the instrument cluster or the center info screen has. What I have found with this truck and might apply to GM trucks for some years now, because I have a gravity flow fuel storage tank on the farm which has a slow flow compared to a typical station fuel pump, I find the tank filling to be wildly inaccurate from one top off to the next if the trucks fuel is over 2/3 full. The trucks computer was saying one thing fairly consistent to how I drove and my mechanical fuel meter was telling me something wildly different, one trip to town it would hand calculate to fantastic mileage and the next tank horrific mileage. Just something I've never encountered with a vehicle before but for some reason this has a quirk to being filled slower than what is typical at a fuel station pump does. Of course I don't dare try to "fill" the tank as I understand the evap system would not like that and may even ruin something in the process. So me being the person that has only hand calculated all my life as no vehicle I personally owned had diddly on it to tell me what mileage it was getting, now I am dependent on the computer if filling at my farm. I guess that's called progress ... maybe ! LOL. 

 

I need/like a base for when i need to fill up or when traveling empty or towing, when to start looking for gas, so i like an average idea, if the dash is reliable. 

    I was and am pleasantly surprised that the dash readout on my cheby, is so close to hand calculated on this rig, i dont need to hand calculate anymore. 

 

    My last pickup an hd diesel was a solid 2 high optimistic, dash vs hand calculated. 

      Im not condoning it,,,, but i,,  for reliability on the emissions parts, had them go away. 

      I gained a solid 2 more mpg's, i didnt need or care about the more hp and tq part, but thats part of it. 

      That said, that diesel then was 4 high on the dash vs hand calculated.

      Both towing before and after the dash was very close to hand calculated.  

[lineman1234]

My gasser has a 45 gallon legal gas rated transfer tank in the bed....

 

My diesel i put a 100 gallon tank in the bed and plumed it with a shut off into the filler neck. 

 

The diesel because it was a regular cab, had a 28 gallon tank. The currant gasser has a 36 gallon tank. So towing  when stock with the diesel was very close to needing fuel in the tank vs towing with the currant gasser with the bigger gas tank getting less fuel economy. 

[Pryme]

8 hours ago, Chuck FB said:

Its more about the theme of the odd quirk in how the fuel tank seems to fill with a slower flow of fuel and due to that I can't trust hand calculating which is something I had not encountered before. I'll see how it seems once I do go on a longer drive and am fuelling up at stations and hopefully then see how close the computer is to hand calculated. Just never know how much to trust a computer system. The technology/information is there in front of me as far as fuel calucations, its if its trust worth or not  in my mind, yet anyway !. 

 

Does the scangauge give information like actual engine oil temperature and pressure, true voltage output and gear position. Of course this is a global B truck so hard to say what its compatible with compared to the global A system.  

 

With this new dash it tells what the fuel mileage is between key starts but deletes itself after the engine is shut down ( again based on what a computer is telling me ) which is interesting simply because the truck is able to do an over all trip calculation as well as this point to point key cycle calculation all at the same time. I've noted that on my particular drives of about 50 miles one way to or from town, that final start and heading home I can get as good as 17.5 as long as I drive easy and keep the speed at no more than 62 ( 100 km an hour that is ). While 17.5 may not sound fantastic and again that would be pure highway driving with no headwind but a bit of hills and everyone else blowing past me like I'm going backwards, trucks from many years back that were lower and lighter would never think of getting that sort of fuel mileage being driven easy, fast ratio gearing in top gear and engine refinements have certainly made a difference. 

 

 

Yes the scan gauge 3 provides all of that for all years of the 2020+ HD trucks. Well not the gear you’re in but that does for the new trucks so that’s good news for you. It has a lot more than that though. It has 3 pages you can go through and each page can display 12 metrics I believe. 
just do a search on this forum for scangauge 3 there are a few threads on it in the HD section. 

Edited July 1, 2025 by Pryme

[Capt Bob]

27 minutes ago, Pryme said:

Yes the scan gauge 3 provides all of that for all years of the 2020+ HD trucks. Well not the gear you’re in but that does for the new trucks so that’s good news for you. It has a lot more than that though. It has 3 pages you can go through and each page can display 12 metrics I believe. 
just do a search on this forum for scangauge 3 there are a few threads on it in the HD section. 

9 metrics but who’s counting.

 

Still, a nice addition and easier to see (for me anyway) than having to “estimate” from the factory gauges. 

Edited July 1, 2025 by Capt Bob

[Chuck FB]

1 hour ago, lineman1234 said:

 

I need/like a base for when i need to fill up or when traveling empty or towing, when to start looking for gas, so i like an average idea, if the dash is reliable. 

    I was and am pleasantly surprised that the dash readout on my cheby, is so close to hand calculated on this rig, i dont need to hand calculate anymore. 

 

    My last pickup an hd diesel was a solid 2 high optimistic, dash vs hand calculated. 

      Im not condoning it,,,, but i,,  for reliability on the emissions parts, had them go away. 

      I gained a solid 2 more mpg's, i didnt need or care about the more hp and tq part, but thats part of it. 

      That said, that diesel then was 4 high on the dash vs hand calculated.

      Both towing before and after the dash was very close to hand calculated.  

I definitely like the various fuel mileage perimeters it gives including the miles to empty although I assume it bases it on what its been doing prior and if hooked up to a trailer it would then need to cycle through some fuel to gain the appreciation of being very thirsty.

 

Deleted pickups is common place here if its possible to delete because the government isn't bothering anyone with deletes, not yet anyway. However when I was doing the diesel/gas debate there was no solution on the market then for the global B GM trucks and not sure if that has now been resolved or not but also do a delete and along with it goes the warranty and that whole game. I decided the costs of the whole picture was out of hand for what they charge for deleting the up to 2023 duramax and would become a real issue to repair any problems on the road as a dealership would not be able to touch it. I have diesel farm equipment all around me but older with little to none of the emissions crap on them so resigned to going a simpler and less powerful route. 

 

Interesting how the computer on your past diesel figured the mileage one way when empty but fell into line when loaded. I would think there are times you miss it because of the power and fuel economy, but like you said before the gas setup with the aux tank allows you to have a common fuel for your generator as a slide in camper doesn't give room like a large trailer with basement storage compartments to overload the trailer !. 

[Chuck FB]

1 hour ago, Pryme said:

Yes the scan gauge 3 provides all of that for all years of the 2020+ HD trucks. Well not the gear you’re in but that does for the new trucks so that’s good news for you. It has a lot more than that though. It has 3 pages you can go through and each page can display 12 metrics I believe. 
just do a search on this forum for scangauge 3 there are a few threads on it in the HD section. 

The Edge or Banks units, are they compatible with the gas engine as they appear more refined in how they are made as well as rigged up with methods to mount them vs the scan gauge. 

[bruceb58]

3 hours ago, Chuck FB said:

The Edge or Banks units, are they compatible with the gas engine as they appear more refined in how they are made as well as rigged up with methods to mount them vs the scan gauge. 

I 3D printed a mount for my scan gauge.

 

Edited July 1, 2025 by bruceb58

[Handy]

I have 10k on my 2024 6.6 gas with 10-speed, and I love it.  I never sense the shifts, and the rpms stay consistent.  No issues.  Averaging about 12-13mpg empty, maxing around 17mpg, drops to about 6mpg towing 7-10k over mountains and desert.  I also have a 2013 Duramax service truck and will replace the chassis with the 6.6 gas/10-speed when the CP4 fails again.

[RyanbabZ71]

On 6/29/2025 at 7:03 PM, newdude said:

If you are talking diesel, the old Allison 1000 was a tank, and GM should have just let Allison find a way to turn the 1000 into an 8 or 10 speed instead of going in house and with Ford on the GM "Allison" BRANDED 10L1000.

 

That said...the 10L1000 with the 6.6 gas is lovely and tows much better than the 6.6/6 speed did and miles ahead of the 6.0/6 speed combo.  I back to back pulled a boat (~7000lbs) with a 6.0/6 speed and then a 2024 6.6 gas/10 speed.  It was no comparison.  The 6.6 gas/10 speed was like towing with a diesel compared to a gas truck.  

 

All that aside as well...if GM can get the valve body quality figured out on the 10 speeds (all versions made from 2020-2024), the 10L family is superior to the 6L80/6L90.  We've not opened up a 10L for major internal work yet, just valve bodies so far.  6Ls its torque converters, smoked 4-5-6 clutches, smoked pumps, etc.  

We still make the 1K/2K 6 speeds   We now have a 9 speed version, not really a pickup application though

 

https://www.allisontransmission.com/applications--products/products/9-speed

[Capt Bob]

2 hours ago, Handy said:

I have 10k on my 2024 6.6 gas with 10-speed, and I love it.  I never sense the shifts, and the rpms stay consistent.  No issues.  Averaging about 12-13mpg empty, maxing around 17mpg, drops to about 6mpg towing 7-10k over mountains and desert.  I also have a 2013 Duramax service truck and will replace the chassis with the 6.6 gas/10-speed when the CP4 fails again.

That mirrors my 2024 other than I have 18K mileage wise. Taking a cruise out to Wyoming this month with our travel trailer and will change the trans fluid on return. I had a trans drain plug added to my 2018 1500 and I’m leaning in the same direction with the 2500.

[Chuck FB]

36 minutes ago, Capt Bob said:

That mirrors my 2024 other than I have 18K mileage wise. Taking a cruise out to Wyoming this month with our travel trailer and will change the trans fluid on return. I had a trans drain plug added to my 2018 1500 and I’m leaning in the same direction with the 2500.

If you decide to install a drain plug into your factory pan, take some photos of it and whatever information if any that you used to decide on the location to install the plug. I expect there would be certain spots or a best location to install it due to not interfering with the trans filter for example or the locations of the magnetic pads. I also presume any of these aftermarket plug install solutions will unfortunately have to stand up a distance inside the pan and takes away from allowing as much fluid to be drained out vs if one had a specialty bung welded into the pan that did not have an internal rise above the bottom interior, or bought an aftermarket pan that fit the limited clearance of the exhaust cross over on the gas trucks. 

[Pryme]

16 hours ago, Capt Bob said:

9 metrics but who’s counting.

 

Still, a nice addition and easier to see (for me anyway) than having to “estimate” from the factory gauges. 

Yeah it is 9 per page. It’s funny I see it daily and still couldn’t recall if it’s 9 or 12. But there are 3 pages, so a guy can display 24 different things.