As the the title says, my truck has a vibration when hitting 40 threw 55mph, it’s like I’m driving on rumble strips, if I let off the gas it’ll stop but pick back up. It’s not a constant rumble but happens heavily at those speeds.
Edit/ 2020 Chevy Colorado Z71 V6, automatic trans, does have 4x4 capability, under 50,000 miles
I had a 2019 Colorado… there’s a known issue with the torque converters. You might want to see if that’s your issue. They “fixed” it on mine but it never went away fully, it might be the same issue with your truck.