Definitely freshen up the oil. You can use (and it is recommended by some experts on this site) 10W30.
Remember that the hydraulics, rear differential and transmission all use the same fluid so make sure to drain everything or you'll be no better off.
Also the source of the water infiltration is very likely the rubber boots around the shift levers, putting new ones on will save you some trouble down the road. I always like to keep a tarp over mine if we're expecting rain 'cause they aren't all that water tight.
That may not fix your problem and if it doesn't come back for more advice, I overhauled the hydraulics on my 202 (same as a TO-35) and I'm in the process of rebuilding the hydraulics on my TO-35. There are others more knowledgeable too but I can try to help.
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