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I have a 2018 GMC Sierra with 93k, After about 30 minutes of driving I start to get a thud feeling and it feels like something is pull the truck backwards for about a half second then it will resume normally. It happens when I am going about 55ish on a mostly flat road, sometimes if I accelerate up a hill it feels somewhat as if I am skipping teeth on what would be a belt driven machine. No engine lights at all. Any ideas? Truck was running fine until last weekend. No other issues.
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Hey man, happened to me on my ’16 Sierra, problem was the transmission, happened around 70 000KM, Had to send it to a shop do to a rebuild, lucky me it was still under warranty.
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