The Chevy Tahoe has no major changes for 2013. It just gets a higher-capacity battery and a couple of new exterior colors, and the grade braking function, which uses engine compression to help slow the vehicle when going down hills, now works in the normal transmission mode instead of only in the Tow/Haul setting.
If there was ever a case for, "if it ain't broke, don't fix it," it was the Chevrolet Tahoe. GM's stable of full-size SUVs which includes the GMC Yukon already dominate the full-size SUV class to the tune of owning around 70 percent of the market. They outsell Ford 5-1, and Toyota 10-1. Yet Chevrolet went all out with the 2015 Chevrolet Tahoe, giving it an all-new chassis, all-new styling, an upgraded suspension and engine, and an interior that's more luxurious than the last-generation Cadillac Escalade. Throw in class-leading technology, and it's clear that there's little out there to dethrone this king of the road.