If this rig has been left out in the elements, or even "shedded" in an unheated or fully or partially enclosed building, you will have condensation.
I'd start evaluating things by draining the oil. You will likely be greeted with water at first when you do this.
Then, pull the gearshift with cover plate from the transmission.
If there are shifting issues with this unit you will have to do this anyway.
You may be able to see what is causing them.
Don't be too surprised if you are looking at a rusty mess once the cover is off, but, then again, you may just get lucky!
OE 30 weight is fine for these gear drive transmissions.
Good luck!
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