CDNSierra

My '23 sierra x31 (40,000 km) is starting to display these shuddering symptoms. Seems to be when I'm driving at a constant speed under 60km/hr (1000-1500 RPM) or around 100km/hr. It will stop shuddering if I quickly shift to neutral. Definitely rules out alignment or tire issues. GM mechanic rode along with me and could feel it also. Said he thinks it's likely the torque converter. Appointment next week to have it replaced. We'll see what happens...