YzGyz sums it up pretty well.
I wouldn't bother testing the battery unless I had some reason to suspect it was bad (eg, slow cranking after a good charge). Same with changing transmission fluid if less than 20000 miles or so on it. YMMV
As long as you are changing all fluids, might want to do the differential, too.
Edit: The Owner's Manual will have a list of fluids that need to be changed periodically. FSM (link in sig) will have procedures if you want to DIY. The only one that is difficult for a shade-tree mechanic is the 7AT; if you have a concrete floor, a decent toolkit, and a few inexpensive tools (eg, IR thermometer, small hand pump), it's not too bad.
Last edited by SouthArk370Z; 07-23-2019 at 12:07 PM.
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