shudder

2016 Yukon Denali, about 53,000 miles. Anyone else noticing a shudder or vibration while at cruising speed? No specific speed or rpm. Doesn't happen when accelerating. Please share ideas; I want to know what I am facing BEFORE I take it to the dealer.

I recently purchased a 2015 Sierra Denali quad cab Standard Box 2wd. 62L I have a violent shudder during light acceleration seems to occur around 30MPH between trans shift points during light acceleration, once the shudder occurs you can remove or increase throttle pressure and it will go away...