DH Denali

I put my truck into the shop at the local GMC dealership on Monday. When I told the Service Rep the problem, he replied "You mean like a tire vibration?" So I was very skeptical about getting the problem solved. They did say it could be the torque converter and suggested a "Fluid Exchange" on the tranny/torque converter. Servicing was covered by the warranty, so no cost to me. I did a 500 mile road trip on Tuesday and it seemed to be cured and I like my truck again.

@Imentzel: Thanks! Is this the service bulletin you are referring to? GM Service Bulletin 20-NA-142 Shudder Surging While Driving.pdf

2018 Sierra 1500 Denali w/ 6.2L, 6-speed, 4x4, 22 inch rims. Shake happens around 58 mph thru about 65 mph. Not happy.