I'm not positive but there should be a zerk fitting on the side of the transom shield or inside on the boss that the Gimble is in. Have you changed the boot yet? If you got water in it I'd pull the drive off (about 30 minutes) & then pull the boot & use a 3-jawed slide hammer to extract the bearing then reassemble it! It should take no more than 2-3 hours. While the drive is off you can inspect the U-joints & lube them!