2024 Chevy 2500 Duramax: Real-World Reliability of the "Allison" 10-Speed Transmission

[Jerry Davis]

Retired , wife and I decided to travel in a Rv before we get too old. So in spring of 2024 we bought a new 2024 Chevrolet Silverado HD 2500 Duramax long bed crew cab with max tow package. And a new GD 303 5th wheel. I have been a General Motors guy for most of my life. Other than owning a pop-up that is the only RV we have owned.

At the time, I thought the Silverado was a good option with an Allison transmission. Allison has had a good tract record. Too my surprise and not doing enough fact checking. The "Allison trans" is in name only ( 2020 and up years). As GM is the builder and these transmissions are failing with valve body failure. Leaving the owner stranded and sitting in the shop for weeks/month at a time waiting to be repaired. And when they do, get repaired using the same parts that have had problems. And many people have had repeated problem.
We have been on several trips and no problems, I like the truck and it tows very good. The truck has only 14,000 miles, but in the back of my mind waiting for it to break down. Have read some transmissions failure is anywhere from several thousand miles to 70,000 miles.

My question to the members, does anyone have a Duramax ( the fake Allison 10 speed transmission started in 2020). If so, any problems and do you plan on keeping the truck.

Our plan was to do some traveling until the "golden Years" were not so golden anymore, and sell truck & Rv when we could not do it anymore. This Duramax was going to be the only truck and to last while we traveled. Now thinking should get rid of truck while it is under warranty. I also understand that Ford has the similar transmission that was developed with Gm.
I would appreciate input from all..... Thanks

Understand now that as of June 2026, Gm will no longer have the logo on the hood of Allison transmission. I would assume these 10 speed transmission are giving Allison transmission a bad name. Too, me, Gm has deceived the public!

 

[Hoopy Frood]

Don't forget that all you're going to read about are the failures and problems. Unless you do a lot of research on actual numbers, you'll likely get a skewed view of the failures/problems. Don't make any decisions based solely on what you read on forums.

 

[Jerry Davis]

Don't forget that all you're going to read about are the failures and problems. Unless you do a lot of research on actual numbers, you'll likely get a skewed view of the failures/problems. Don't make any decisions based solely on what you read on forums.

There were 400,000 recalls on the 2020 to 2022 models. And now some of the 2023 & 2024 are having the same problem

 

[txloser]

On my 3rd 2020+ Dmax. I’ve not yet had an issue. Most of this had been towing a 12k lb and 14k lb FW. Lots of miles in Colorado/NM/WY making the truck work.

It’s a real issue. Has affected many, but in the big picture, it’s a small percentage of vehicles I’d imagine. I’ve worried about it myself. Even got an estimate on install for an aftermarket valve body. Never pulled the trigger. Could it happen? Yes. Is it probable? No.

I’m hearing less chatter about it on the forums. It’s either settling down or dealers are getting new VB’s quickly so it’s less of an inconvenience. Don’t know which.

 

[Jerry Davis]

On my 3rd 2020+ Dmax. I’ve not yet had an issue. Most of this had been towing a 12k lb and 14k lb FW. Lots of miles in Colorado/NM/WY making the truck work.

It’s a real issue. Has affected many, but in the big picture, it’s a small percentage of vehicles I’d imagine. I’ve worried about it myself. Even got an estimate on install for an aftermarket valve body. Never pulled the trigger. Could it happen? Yes. Is it probable? No.

I’m hearing less chatter about it on the forums. It’s either settling down or dealers are getting new VB’s quickly so it’s less of an inconvenience. Don’t know which.

What makes me upset, is the fact that GM was using the Allison name when it is not produced by Allison

 

[JKellerJr]

At the very least Allison signed off on it. Right or wrong, if I would be upset with someone it would be with them. They supposedly approved the design. Probably got a big check to use the name but regardless they allowed their name to be used.

Its a big debate on whether the HD 10 speed was developed with Ford. The light duty 10 speed was for sure. The HD one's are very similar but not exactly the same so I imagine there was some collaboration.

Between our company and personally we have 3 of them now. 2 '24 Duramax's and one '25 gas. The '24's have been flawless but the '25 just went in for some clutch packs and pump but nothing to do with the valve body. Both '24's pull 17, 18k trailers and I drive my 'max daily for work.

Its not a guaranteed problem, there are hot shot drivers with hundreds of thousands of miles on them without issues but no denying that its more than a small issue. The big delay's in getting them fixed seem to have subsided. In my completely uneducated, non expert, guesstimate opinion, it's more of a problem with around town drives, lots of up and down through the gears vs long haul highway drives with less shifting. There are aftermarket valve bodies that seem to solve the issue that would cost less than a sell and buy another if one is really worried about it. I figure I got 100k of a warranty to see how it shakes out.

As far as selling and changing, the problem is to what. Ford still uses the CP4 fuel pump and I believe their 10 speed had some growing pains also (though nothing like the GM's). Ram has a new 8 speed trans from ZF that has a good rep but is still new for them. While I like Ram (loved the '14 I had) with all the crap going on with Stellantis, I'd want to wait a bit until the new guard in charge of Ram has a chance to regain control (well the new, old guard that resigned because of the crap from Stellantis but came back when the CEO got fired)

 

[COGrandDes]

This is my third D-Max and Allison combo and I've loved them all. No issues with any of them. None of them returned to the dealer for anything after the sale other than the missing chips on my latest.

 

[Jerry Davis]

At the very least Allison signed off on it. Right or wrong, if I would be upset with someone it would be with them. They supposedly approved the design. Probably got a big check to use the name but regardless they allowed their name to be used.

Its a big debate on whether the HD 10 speed was developed with Ford. The light duty 10 speed was for sure. The HD one's are very similar but not exactly the same so I imagine there was some collaboration.

Between our company and personally we have 3 of them now. 2 '24 Duramax's and one '25 gas. The '24's have been flawless but the '25 just went in for some clutch packs and pump but nothing to do with the valve body. Both '24's pull 17, 18k trailers and I drive my 'max daily for work.

Its not a guaranteed problem, there are hot shot drivers with hundreds of thousands of miles on them without issues but no denying that its more than a small issue. The big delay's in getting them fixed seem to have subsided. In my completely uneducated, non expert, guesstimate opinion, it's more of a problem with around town drives, lots of up and down through the gears vs long haul highway drives with less shifting. There are aftermarket valve bodies that seem to solve the issue that would cost less than a sell and buy another if one is really worried about it. I figure I got 100k of a warranty to see how it shakes out.

As far as selling and changing, the problem is to what. Ford still uses the CP4 fuel pump and I believe their 10 speed had some growing pains also (though nothing like the GM's). Ram has a new 8 speed trans from ZF that has a good rep but is still new for them. While I like Ram (loved the '14 I had) with all the crap going on with Stellantis, I'd want to wait a bit until the new guard in charge of Ram has a chance to regain control (well the new, old guard that resigned because of the crap from Stellantis but came back when the CEO got fired)

agree,what to change to?

 

[Lthrailkill]

I thinking GM sold Allison back in the early 2000s, meaning GM has up until then produce the Allison transmission, so what i don't get is if they have been producing (owning the company that does) why are they having some issues now?
Is it because they came out with a 10 speed that gets the exact or worst fuel mileage than the 6 speed.
Doesn't make sense to me.

 

[Dan_Frisbie]

88,000+ miles on my 2021 3500 Duramax.
No problems.
As someone else stated, you're not going to hear a lot of "...my truck is just fine, no problems..." posts or threads. You're going to read about the pissed off owners that have problems.

 

[SGT ROC]

At the very least Allison signed off on it. Right or wrong, if I would be upset with someone it would be with them. They supposedly approved the design. Probably got a big check to use the name but regardless they allowed their name to be used.

Its a big debate on whether the HD 10 speed was developed with Ford. The light duty 10 speed was for sure. The HD one's are very similar but not exactly the same so I imagine there was some collaboration.

Between our company and personally we have 3 of them now. 2 '24 Duramax's and one '25 gas. The '24's have been flawless but the '25 just went in for some clutch packs and pump but nothing to do with the valve body. Both '24's pull 17, 18k trailers and I drive my 'max daily for work.

Its not a guaranteed problem, there are hot shot drivers with hundreds of thousands of miles on them without issues but no denying that its more than a small issue. The big delay's in getting them fixed seem to have subsided. In my completely uneducated, non expert, guesstimate opinion, it's more of a problem with around town drives, lots of up and down through the gears vs long haul highway drives with less shifting. There are aftermarket valve bodies that seem to solve the issue that would cost less than a sell and buy another if one is really worried about it. I figure I got 100k of a warranty to see how it shakes out.

As far as selling and changing, the problem is to what. Ford still uses the CP4 fuel pump and I believe their 10 speed had some growing pains also (though nothing like the GM's). Ram has a new 8 speed trans from ZF that has a good rep but is still new for them. While I like Ram (loved the '14 I had) with all the crap going on with Stellantis, I'd want to wait a bit until the new guard in charge of Ram has a chance to regain control (well the new, old guard that resigned because of the crap from Stellantis but came back when the CEO got fired)

GM and Ford have been collaborating on designs on their transmissions for many years. The company I worked for until retirement made the clutch plates for both. In many cases the only difference was their LOGO on some of the plates. That was on the 6 speed. I do not know if my old company still makes the clutch plates, as I retired before any new designs were being manufactured, and the company has since been bought by American Axle. They do make transmission parts, but I do not know which design. I have the 10 speed, but my truck is a gasser. At the rate I put miles on my trucks I am years down the road before Issues MIGHT arise. I'll deal with it then.

 

[Kurt and Deb]

Hi Jerry, just adding some data points to your requested collection.

I have the same basic truck as you (2024 Silverado HD 2500 Duramax with max tow package). Bought it new and currently have about 37k miles on it. No drivetrain issues to date, but definitely NOT selling/trading my "maybe" for someone else's "maybe". And it has a 5 year/100k mile warranty so I'm not too worried (knock on wood).

I love the truck and it does what I ask of it (tow 16k 5th wheel).

Good luck, Kurt

 

[txloser]

Well here you go. Don’t know if it’s real.

 

[JKellerJr]

I have the 10 speed, but my truck is a gasser. At the rate I put miles on my trucks I am years down the road before Issues MIGHT arise. I'll deal with it then.

Well another data point that contradicts my earlier post a bit. Our 2025 6.6 gas w/10 speed (11k miles) is down with trans issues not related to the valve body. Best case, middle of December to get parts and fixed. Driven mostly empty with an occasional 10K max load

 

[Wileykid]

'23 Chevy 3500 Dmax with 46K miles on it, 16K miles of towing my 15K lb 5th wheel. No issue's with the engine or tranny. Only issue was when new, one of the electronic gizmo's didn't want to work properly, took some time, but fixed.