2014 and 2015 Silverado 1500 LTZ models equipped with the Z71 package have different grilles.

2014 seen here:

2015 seen here:


Also, High Country and Sierra Denali models received a body-colored painted shark fin for 2015.

2014:

2015:


2014:

2015:


GMC Sierra with All-Terrain option changed from chrome trim for the 2016 model, to black painted trim on the 2017 model. Also, for 2016 All-Terrain was an available option for both SLE and SLT trim, for 2017-2018 it became an SLT only option.

2016 All-Terrain Crew Cab SLT:

2017 All-Terrain Crew Cab SLT


Of note, 2016 All-Terrain SLE models had LED taillamps (like SLT and Denali) while all other SLE models had incandescent taillamps.


vs.