well my new to me 2014 silverado high country has the shaker option also! so far I've owned a
2015 silverado double cab 1500 LT z71 5.3l
2015 GMC Sierra crew cab 1500 SLE 5.3l
2014 Silverado high country crew cab 1500 5.3l
THEY ALL SHAKE!!
my current truck the high country has a more exact shake. Its at 45 mph and 75 mph……almost exactly! i went through GM on my 2015 silverado and GMC sierra their tires not balancing is total garbage. their trucks never did this before i can't believe they are honestly telling people its tires.