This week I changed oils, filters and fluids in both diffs, transfer case, engine and gearbox. I can confirm that this is an easy job for even amatuers and not too costly. Definitely get a oil pump from supercheap for $7 though, that screws onto the oil bottle and pumps the oil into the gearbox/diff/TC along a small clear tube. Makes it so much easier!
Some before and after pics of filters for reference and posterity.
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