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I've had 2 2020 silverados with 3.0 diesels and 10 spd transmissions. The 1st i bought new and transmission failed at 80k. They replaced it under warranty but i sold it soon after because it spooked me, since I travel for a living and i couldn't trust it anymore. Then, after missing it (I truly loved that truck) I bought another used truck with 90k miles. I figured it had lasted longer than my original truck, si it must have been a fluke. Nope. Within 2 months it's transmission blew. They had it for 7 weeks to try to fix valve body. Then I got it back. And it blew again 2 months later. A different dealership had it for 5 weeks. The put a new transmission in. It lasted about 1 month and blew again. Dealership replaced again, but this time they figured out why it blew (dealership tech error during install). I've since put another 110k on it (truck now has over 210 k) and it's running strong, but I am worried as now if it goes. There's no warranty left