2021 Silverado RST 1500 10sp 6.2 4wd. At 145k miles my torque converter went and trashed the transmission. I had a Chevy dealership replace it with a new one with a GM 3yr warranty.
Well, now at 186k, right as I was going to schedule its first transmission service, it started acting up. The best way i can describe it is, when trying to maintain a constant speed, the truck lightly bucks, sort of like a bad engine miss, but its definitely the transmission. Also, when slowing to a stop, once you get below 15 - 20mph, it feels like your driving over a mild rumble strip (and it ONLY happens at that low speed, unlike when my first transmission took a crap).
Its at the dealership now, but oddly the day I was dropping it off, it practically stopped acting up! They said they could only get it to do the same thing one time and only briefly.
Any thoughts on what it could be this time? They haven't dropped the pan yet and said they will drive it some more to see if it will act up again. Also, said oil was a little dark but didn't look "burnt"?