Sassea, Just a note on the Hurth tranny. I had a 4-108, with a Hurth on another boat, and about 600 hrs into service it would not shift.
Mine was not water cooled and I discovered that the heat is an issue. Had it rebuilt by an outfit on the west coast , Tampa, I think. Not a lot of money. Sounds like you are going to pull the tranny, so might as well bite the bullet and have it rebuilt.
Jules