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
Check your tires for flat spots, unven wear, etc. check your tire pressures. Should be at spec or near. Check the roundness of the rims. If not, check all bushings for control arms, steering components, etc.