oil change

My Tahoe just crossed over 75k (bought the car at 55k) and I want this thing to keep running, especially since the transmission clunked out around 68k, trying to avoid another $3k bill! I do the oil every ~3k and the fuel filter once a year (which is about every 10-15k). I couldn't find any...

I have a 2004 Tahoe 4.8L 2x4 bought, driven, and maintained excellently in the hot streets of Arizona with 52k miles on it, stock. Now I want to do a few things to this truck myself, but need a couple helpful people to give me some steps to begin, as well as some tutorials if you are willing...