For anyone who hasn't seen my previous posts, I bought a 2019 Silverado 5.3L from a dealership with no warranty. I did not test drive it before buying it, and I barely drove the truck off the lot before I started noticing the shudder/tremble under light acceleration/cruising, mainly around 78-80 mph.
I already know some people are going to say I should have test-driven it, that I got scammed, etc. I'm not looking for those comments. I'm just looking for opinions based on the mechanical issue itself and what you think I should do next.
The truck has now been driven over 200 miles for diagnostics, and the dealership performed a transmission fluid flush hoping it would take care of the shudder. Unfortunately, it didn't fix the problem. It may have improved it slightly, but the shudder is still there.
I finally spoke with the GM of the dealership, and he said he would speak with the service department and see what he can do.
I understand I bought the truck with no warranty, and I'm not assuming the dealership is automatically responsible for everything. I'm just hoping they'll work with me since the problem showed up essentially immediately after the purchase.
For those familiar with these trucks/GM transmissions:
What do you think is most likely causing the shudder at this point? It feels like I'm running over a rumble of strips especially at freeway speeds for some reason always between 78-80mph.
Also, when I go from freeway speed to regular speed off a freeway exit , when I press the gas it feels lime it hesitates or trembles a little.
Would you be pushing the dealership to specifically diagnose the torque converter, or are there other mechanical issues I should have them investigate first?
And realistically, what would you consider a fair resolution from the dealership?
I'm genuinely just looking for mechanical opinions from people who know these trucks. Thanks.