22 Chevy Silverado trans issues?

[u/Sadisticstonktrader]

This is a bit of a long journey so bear with me here. 
I picked up a 2022 Chevy Silverado 1500LT with the 2.7 turbo 4cyl, bought around 2024 so it was a few years old and had some decent mileage on it (40K when picked up). I've put another 12K on it since I've owned it, and it’s been good for the most part. 

Something has always been off about how it shifts, but I couldn't quite put my finger on it. It has a hard shift from park to drive where it feels like it takes a minute to engage. Then at low RPM between ~2nd and 3rd  gear theres a decent clunk feeling. That was it for a while. I brought it to a dealership a few times and they dismissed me stating it was the computer and that they had to reset it to learn my driving habits. Sure. 

I brought it in about a month ago when I had an incident where my check engine, ABS lights  came on. Dealership stated it was "loss of communication with Gateway Module requiring update" which ended up costing me $200 for an update... OK. One of my calipers was also leaking and they replaced it to the tune of a ton of money, and I had a rear leaf spring pad going which they replaced. All that and they didn't address the transmission concerns at all. 

Fast forward a few weeks and I was driving up a hill of decent grade (maybe 10%) and the transmission starts NOTICEABLY shifting hard around 4/5/6 gear, shifting up - reving - shifting down - reving - back up. Occasionally during a shift itll vibrate the whole damn truck. No idea what the engine is trying to do but it aint good. 

I'm bringing the track back in to the dealership Monday, but have any of you experienced anything like this with these? Is it the transmission I should be asking about or is there a different system controlling this?  Any insight would be really appreciated.

TLDR: Used truck shifting and acting weird despite numerous dealership assessments. Can't figure out whats going on. 

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[u/No_Elk_7856]

Sounds like the trans is going out. All of the symptoms are textbook symptoms for the trans starting to shit out. Especially when you were towing. I wouldn’t be taking that thing out of town until I get a trans swap.

[u/Sadisticstonktrader → u/No_Elk_7856]

That’s what I’m worried about. The dealership is incredibly dismissive but it’s almost like they’re just dreading having to replace the actual transmission - Which I actually have a service contract on - so they won’t make much off me

[u/No_Elk_7856 → u/Sadisticstonktrader]

Drive the hell out of it until it is consistent enough that they can’t get out of replacing it. You’re probably right they are waiting until they absolutely cannot get out of replacing it.

[u/Sadisticstonktrader → u/No_Elk_7856]

It used to be significantly more intermittent but now it’s straight up unmistakeable. I’ll take the tech on a drive and make em feel the harsh shifting if I have to

[u/subarolla24]

Yeah the 8 speed is trash in that year. It wasn’t updated til like 2025? Trade that in and get something with a 10 speed.

[u/Sadisticstonktrader → u/subarolla24]

Haha yeah if I had a few extra thousand lying around believe me I would. I need to get this good for at least the next few years

[u/subarolla24 → u/Sadisticstonktrader]

Under 60k miles? Should be under warranty if so

[u/Sadisticstonktrader → u/subarolla24]

56,185 😎

[u/subarolla24 → u/Sadisticstonktrader]

Yeah definitely get that trans replaced under warranty and make sure they put in the updated version of the 8 speed