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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

94yj
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94yj Enthusiast

94yj

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Posted (edited)

are  the new 10 speeds that come on the 24 up HD 2500 trucks are they any better reliability and fuel mileage wise than the older 6 speed transmissions? TIA 

Edited by 94yj
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newdude
newdude

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 "All

bruceb58
bruceb58

I 3D printed a mount for my scan gauge.  

Black02Silverado
Black02Silverado

What is sad is GM basically has made all vehicles a planned obsolescence. I stopped this at a point that the engineer explains it.  Sad but as always, manufactures are all about saving $$$$ and they d

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Xray135 Enthusiast

Xray135

Posted
Posted

Can’t say for a ‘24 but my ‘20 seems to get better mileage. If I keep my foot out of it I can get close to 20mpg on the highway, free running not towing/hauling. Trans shifts wonderfully, hardly feel the actual shift

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Pryme Senior Enthusiast

Pryme

Posted
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2 hours ago, 94yj said:

are  the new 10 speeds that come on the 24 up trucks are they any better reliability and fuel mileage wise than the older 6 speed transmissions? TIA 

Based on posts made here and seeing stuff online and YouTube I would say the 10spd especially the 24’s are not as reliable as the 6 speed 6L90. I personally wouldn’t have any desire to get into one from my current 6spd. 

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bruceb58 Enthusiast

bruceb58

Posted
Posted

The reason I waited for 2024 was to get the 10 speed. Loved it in my F-150 and love it in my 2024 GMC.

Atlas Senior Enthusiast

Atlas

Posted
Posted (edited)

Since it was developed with Ford, we can attribute any lack of reliability or any weakness to their engineers 😉

 

Purely subjective: No idea about long-term reliability but I like the 10-speed over the 8-speed, and I disliked the 8 speed over the 6 speed. I wasn't expecting to like the 10 more than the 8, as I generally dislike how shift-happy modern transmissions are, and things became too shifty for me after 6 speeds. GM's 8 also felt really lackluster compared to Stellantis' use of ZF 8-speeds and ZF-licensed in-house 8-speeds, even though the GM 8 speed was also based on a ZF design. Initial impressions of the 10 are.. very good.

Edited by Atlas
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Another JR Senior Enthusiast

Another JR

Posted
Posted

If a dealer offered me an otherwise identical new 2025 10 speed as a straight trade for my 2021 6 speed (which has only 13k miles), I would decline.  

Johnjr Enthusiast

Johnjr

Posted
Posted

Assuming we’re talking about the HD, I love how the transmission shifts, but it gets 3-4 mpg less than my 17’ l5p. Don’t know why.

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bruceb58 Enthusiast

bruceb58

Posted
Posted
9 hours ago, Atlas said:

Since it was developed with Ford, we can attribute any lack of reliability or any weakness to their engineers 😉

 

Only the 1/2T version was co developed with Ford.

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AndrewF Enthusiast

AndrewF

Posted
Posted

I like my '24 10 speed. It doesn't seem shift happy and having the extra spread of gears is great for highway towing. As with anything these days some people have valve body issues but so far so good for me. But time will tell. 

 

The main reason if I were you that I wouldn't want the newer trucks is the global b electrical system, '23 and older (global a) are simpler (or at least better understood), don't come with standard with automatic emergency braking (which I didn't want), and currently have much easier/cheaper tuning options available. 

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Atlas Senior Enthusiast

Atlas

Posted
Posted
6 hours ago, bruceb58 said:

Only the 1/2T version was co developed with Ford.

 

Yep. I realized I picked up on a thread for the HD's. Mine is just a 1500. Disregard!

Z45 Senior Enthusiast

Z45

Posted
Posted (edited)

My 2021 10 sp Sierra performed flawlessly. 

 

Side note;  Everyone of those recalled (2021-24) approx. 600,000 6.2L engines are mated to a 10-sp trans. 

Edited by Z45
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lineman1234 Enthusiast

lineman1234

Posted
Posted

Yes, according to some internet people the transmission suck, me i have 36,000 miles on my 2024 no problems or for-see any. I havent personally heard anyone i know that has one have a problem with the transmission, oil leaks, tranns leaking, mirror rattling, and other things. 

 

I somehow was able to make my own decision and bought mine sight unseen 176 miles away, new,,,, without coming to the internet to ask anyone. 

 

I drive moderately, and only 2 over the posted speed limit no matter where i go, on highways/interstates, not in towns. Its flat and smooth hear lots of 55-60mph roads, tank to tank, i have never seen 20 mpg and doubt i will. 

 

Its an HD, ( not ) made for fuel economy. 

 

My first vehicle with more than 6 speeds, and i love it.... I have for about a year and a half, towed a 5ver south and about then back north, past winter months and its flawless, now i added a truck camper for wandering, the 3500 and tranns loves the 10 speed. Calm at 65, it will actually go and stay in 10 gear no problems. I never use tow/haul on anything. 

Chuck FB Enthusiast

Chuck FB

Posted
Posted
On 6/27/2025 at 8:11 AM, lineman1234 said:

Yes, according to some internet people the transmission suck, me i have 36,000 miles on my 2024 no problems or for-see any. I havent personally heard anyone i know that has one have a problem with the transmission, oil leaks, tranns leaking, mirror rattling, and other things. 

 

I somehow was able to make my own decision and bought mine sight unseen 176 miles away, new,,,, without coming to the internet to ask anyone. 

 

I drive moderately, and only 2 over the posted speed limit no matter where i go, on highways/interstates, not in towns. Its flat and smooth hear lots of 55-60mph roads, tank to tank, i have never seen 20 mpg and doubt i will. 

 

Its an HD, ( not ) made for fuel economy. 

 

My first vehicle with more than 6 speeds, and i love it.... I have for about a year and a half, towed a 5ver south and about then back north, past winter months and its flawless, now i added a truck camper for wandering, the 3500 and tranns loves the 10 speed. Calm at 65, it will actually go and stay in 10 gear no problems. I never use tow/haul on anything. 

The dash information of the WT models, does it include the best/average of the 25/50/450 mile distances ?. While I realize its not giving realistic fuel mileage it lists on the "best" side category, certainly in the 25 mile distance, I'd be curious to hear what numbers others with the gas trucks have shown. Mine happens to show 19.3 as a best 25 mile while on the other end the best 450 is 15.2. I have not been on any longer drives with it so don't have a handle on what to really expect as its been my typical drives 50 miles one way to a small city and back along with running around the city some and just driving it easy and no load. The fuel mileage just drops when driving around town, no surprise there with a heavy truck and some engine restarts. 

newdude Senior Enthusiast

newdude

Posted
Posted (edited)

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.  

Edited by newdude
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lineman1234 Enthusiast

lineman1234

Posted
Posted
15 hours ago, Chuck FB said:

The dash information of the WT models, does it include the best/average of the 25/50/450 mile distances ?. While I realize its not giving realistic fuel mileage it lists on the "best" side category, certainly in the 25 mile distance, I'd be curious to hear what numbers others with the gas trucks have shown. Mine happens to show 19.3 as a best 25 mile while on the other end the best 450 is 15.2. I have not been on any longer drives with it so don't have a handle on what to really expect as its been my typical drives 50 miles one way to a small city and back along with running around the city some and just driving it easy and no load. The fuel mileage just drops when driving around town, no surprise there with a heavy truck and some engine restarts. 

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

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