im currently in the market for a 02+ silverado 2500 crew cab short box, auto 4x4, im just trying to find out what to look for when shopping around. what are some common problems with the trucks? any trans issuses? what about turbo and/or injector issues? ive seen mpg figures anywhere from 10mpg-25mpg, what can one expect in reality? what are the differences in models? (i.e. LT, LS, etc...) what are the differences in motors and how can i tell which one is in the truck? (LLY, LBZ, etc...) thanks in advance, i did a search to no avail. hopefully with everyones help ill soon be a very proud owner of a duramax.