The Tahoe was redesigned for the 2000 model year on the new GMT800 platform, still shared with the full-sized pickups. Two new engines replaced the old 5.7 L (350 cu in) small-block V8, and while both were smaller, both produced more power. The manual transmission was dropped, leaving only the automatic transmission.
Both vehicles received significant updates with only the grille and headlights distinguishing one from the other. Both vehicles now featured softer lines as part of a more aerodynamic design. The interior was also updated with new seats, dashboard, and door panels.
Source: Wikipedia, 2012