Chevrolet Avalanche Transmission by year

Year	Transmission
2013	6-speed automatic
2012	6-speed automatic
2011	6-speed automatic
2010	6-speed automatic
2009	6-speed automatic
2008	4-speed automatic
2007	4-speed automatic
2006	4-speed automatic
2005	4-speed automatic
2004	4-speed automatic
2003	4-speed automatic
2002	4-speed automatic

Source: U.S. EPA / DOE fuel economy data (fueleconomy.gov).