Yes, now would be an excellent time to change your transmission filter, before mowing season really starts. As far as changing out your fluid in the rear end / transmission, well that would require you to remove the back plate off of the rear end. You can if you want to but that means buying a new gasket and sealant. It is not necessary to do, but it probably has never been done in the last 40+ years. Usually, just changing the filter is sufficient. There are 4 bolts that hold the engine to the frame. The back two are easy to get to, but the front two require you to jack up the front of the cub cadet high enough to teeter the front axle. Then place blocks or something to hold it up and secure the back tires so it doesn't take a roll on you. Use a box wrench to get into the bolts as you teeter the axle down for each one. Then your engine is free and able to be slide forward while you make your repair. This is assuming that you have removed the 4 bolts at the back coupler behind the engine.
Cub Cadet 123
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Still don't know what I'm doing in OHIO?.....If you find me, then please point me back toward INDIANA. 
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