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re: 2017 GMC Sierra Transmission - Warranty Coverage

Posted on 8/24/21 at 2:05 pm to
Posted by TeeBoy
suches, ga
Member since Sep 2006
317 posts
Posted on 8/24/21 at 2:05 pm to
I have a 2018 Sierra with 6.2l 8 speed automatic. I had the shutter at 40,000 miles, and they fixed it for free. There’s a TSB out on it. To fix it they just flush the tranny fluid and replace it with better stuff. No problems since (10k miles)
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