After pulling off my drive yesterday and sanding down all of the corrosion, I replaced the anodes with Magnesium ones. The ones that were on there were deteriorated but weighed a heck of a lot more than the new ones which leads me to believe that they were either Zinc or Aluminum. I'm pretty peeved that all the corrosion didn't need to happen had I pulled them off and replaced them last year. The job is a bear, all the sanding and scraping but I'm making progress. At least the U joint bellows are in great shape and don't need to be done now. I'll leave them till next year. I have the new ones but don't have the time right now to pull off the gimbal pivot housing. All my spare time is going into the sanding and painting. At least the transom mount and gimbal pivot housing look halfway decent now, I'm heading outside in an hour or so to finish sanding and prepping the drive for paint. The gimbal bearing is fine as well as the engine alignment. So, the lesson learned is to take a really good look at the anodes to make sure they are the correct ones. I boat exclusively in fresh water so Magnesium is the best bet.