The 2002 GMC Sierra-2500HD has a 5-speed manual.
The 2002 GMC Yukon has a 4-speed automatic.
The 2002 GMC Savana has a 4-speed automatic.
The 2002 GMC Savana-Cargo has a 4-speed automatic.
The 2002 GMC Yukon-XL has a 4-speed automatic.
It's worth about $13,000. See quotes at http://www.edmunds.com/gmc/sierra2500hd/2006/index.html
Remove the transmission dipstick and read it, it will tell what is the correct fluid to use.
The starter for a 2002 GMC truck is located on the passenger side of the block by the transmission.
The 2002 GMC Savana runs on regular unleaded.
The 2002 GMC Yukon runs on regular unleaded.
The 2011 GMC Canyon has a 5-speed manual.
The 2008 GMC Savana has a 4-speed automatic.
The 2010 GMC Savana has a 4-speed automatic.