Cusser
+1y
(1) Get mother-in-law out of the back.
(2) Changing transmission oil and differential oil is straightforward, but buy the pump that fits on top of your transmission oil bottles. This is 80W-90 oil, NOT automatic transmission fluid. Always loosen the fill plugs first (so you know you can), then drain out the old oil. Replace filler bolt, pump in the new oil until it starts to flow out the fill hole, then replace that. It may help to have a helper pump the oil (and change bottles as necessary) while you hold the tube in the filler hole. I use Valvoline trans oil.