Any 2020 or 2021 Duramax owners on here? How do you like the truck?
I'm wanting to trade my 2019 1500 Trail Boss for a new diesel. Looking at a 2021 sierra AT4. I read that some people had problems early on with the 10 speed "Allison." Have those been cleared up? Are there any other known issues with this truck?
Please advise.
I'm wanting to trade my 2019 1500 Trail Boss for a new diesel. Looking at a 2021 sierra AT4. I read that some people had problems early on with the 10 speed "Allison." Have those been cleared up? Are there any other known issues with this truck?
Please advise.
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