Follow up, 1985 245 with tranny fluid leaking after overfill, then very minor leak afterwards.
I pulled off the speedo gear from the rear of the tranny and found a partially broken sprocket, a bad main O-ring and deteriorated thread tape (if any).
I have a photo, I hope this will be the source of my leak.
Question: At the base of the sprocket - does an o-ring go there? I see where there is 1 main o-ring around the middle of the sensor body, 1 rubber cap that fits into the tube going to the speedo? Did I miss any? How many total?
THanks!
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Jamie