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GMC and Chevy Guy (not verified)    December 5, 2024 - 2:12PM

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My opinion is that the 8 speed transmission in theses GMC and Chevy trucks are bad news.

My 2020 Sierra 5.3L has had the transmission replaced within 12k miles and now at 69k had torque converter rebuilt. Hard shifts and overall awkward shifting was the problem. At one point stuck in 1st no matter what I tried for about 40 miles and then it finally shifted. Crazy! I’ve heard it all. And dealer initially tried all sort of things.

I’d love to hear that GM knows why and has resolved their errors in engineering and testing so I can be confident about buying another GM truck but I’m not holding my breath

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