Welcome from Oregon. I just bend that shift linkage bracket out of the way to pull the pan. The bolts are big Torx and are on top of the trans where it’s really hard to get to. Just remember to bend it back when you’re done. You’ll have to lower the front diff too but all you have to do is remove the 4 bolts holding it up to the frame and let it drop down, then pry a tiny bit down as you slide the pan out. I would change all the fluids in the vehicle- front and rear difs, trans, engine oil, engine coolant, brake fluid, power steering fluid, transfer case fluid. I think that’s all of them.