My 09 V6 has 107k on it. I'm new to changing any fluids other than oil, really. So, if I have this right there are two transfer cases and how many differentials to do, three? And I plan to do the transmission fluid, coolant change, and I have to change one of my o2 sensors. I ordered that already. But what fluids and supplies do I need for the rest? And should I do the plugs myself or have a shop do them? The 6 looks complicates with the back 3 under part of the intake.