so I'm in the market for a newer (2008-2010) Chevy truck and I had a friend who is a service writer at a GM dealership tell me the 6 speeds are the way to go but I'm having trouble figuring out how to tell over the internet with trucks have 4 speed in which ones have 6 speeds. is there anything I can look at to be sure which one has which what I'm searching for Trucks that are 500 miles from my home. Different shifter? Vin number etc.... thanks!!!