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A GMC Savana 1500 is used for several things. A GMC Savana is a large van, so it can be used for transporting large amounts of material to and from places. It is also possible to use it solely for commuting, but that is likely fuel inefficient.
I have a 1999 gmc savana 1500 5.7 and i just replaced my transmission and it was a 4L60E. So yours should be the same.
possibly a clogged catalytic converter
4L60E or 4L80E depending on engine, 1500, 2500, or 3500.
The 2008 GMC Savana has 16 valves.
The 2010 GMC Savana has 16 valves.
The 2009 GMC Savana has 16 valves.
The 2011 GMC Savana has 16 valves.
The 2009 GMC Savana has a V8 engine.
The 2014 GMC Savana has a V8 engine.
The 2010 GMC Savana has a V8 engine.
The 2005 GMC Savana has 12 valves.