Allison 10 speed failure on a 2020 GMC 3500 with 13,500 miles

Richard Helm · August 26, 2022

I have 13,500 miles on my 2020 Duramax 3500 towing a fifth wheel with a max gross of 16,000 pounds and the transmission started making a gear noise. The dealer is telling me that all of my clutches are burned up and my torque converter is bad. I would like them to swap out the transmission with a new one but they are saying no. In addition the parts are backordered. Has anyone had a problem like this, and have you been able to get a new transmission?

GMCustomerService · August 26, 2022

11 hours ago, Richard Helm said:

I have 13,500 miles on my 2020 Duramax 3500 towing a fifth wheel with a max gross of 16,000 pounds and the transmission started making a gear noise. The dealer is telling me that all of my clutches are burned up and my torque converter is bad. I would like them to swap out the transmission with a new one but they are saying no. In addition the parts are backordered. Has anyone had a problem like this, and have you been able to get a new transmission?

This is certainly not what we like to hear, Richard Helm. Please know, customer satisfaction is extremely important to us. Our team would be more than happy to take a closer look into the concerns with your 2020 Duramax 3500. To do so, please send an email to [email protected] with ATTN: Richard Helm/GM Trucks in the subject line.

Please include your contact information, VIN, a brief description of your concern, and the name of your preferred dealership. We look forward to hearing from you. To learn more about GM’s privacy policy, please visit https://www.gm.com/privacy-statement.html.

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chuckies76ta · November 3, 2022

So what happened to the tranny and what was done to fix it from GM? Thanks updates?

Richard Helm · November 3, 2022

The finaly put in a new transmission. Then, a week later, my DEF injector failed and had to be replaced. I'm not having the best of luck with this truck.

When it is running, I love it. It tows my 5th wheel like nothing. I am just not very confident in it. I purchase a roadside assistance plan with unlimited towing from Good Sam.