any suggestions on how to approach a dealer who seems to know all but i am not sure he does and definitly thinks i know nothing.Ill be taking it for some service at 10k and over all i am liking my truck outside of a few querks one being the post that says crackling wind noise, and it seems to be a little leakage around the fuel line that fits into the top of the vale cover.What i really need to know is how to figure out what computer updates were performed on my vehicle.i follewed a link from this group to gm .com and put in my vin for calibration history and printed out 2 pages of part # and discriptions i feel that its possible that my truck fits a few discriptions such as i did some pulling the other day in reverse 4 wheel low and the power was poor. How do i know what has been performed and what has not ? once again any info on this subject would be greatfully appreceated Thanks
2001 d/a 4x4 ext cab 8 ft box