I have a Mercruiser Bravo III sterndrive. My gimbal housing has been replaced three times. The saltwater enters from the shaft-swivel seal and starts to corrode. The last one lasted 10 months. Can anyone help

sounds like an electrolysis problem.
how are the zincs??
make sure all the ground cables are installed.
engine to transom plate. transom plate to steering arm.
bell housing to outer transom assembly.

YOU NEED TO TALK TO ME. WE MAKE A HP SWIVEL SHAFT THAT WILL NOT CORRODE. MADE OF 17-4 STAINLESS.WHEN YOU PUT NEW SEAL IN YOU MUST LOCKTITE IT, AND GREASE SWIVEL SHAFT. THIS WILL MAKE SEAL LIVE LONGER. A LITTLE SALTY WATER ON A STANDARD SWIVEL SHAFT WILL CORRODE & RUST IT INSTANTLY, AND TEAR OUT SEAL. CHECK OUT OUR WEB SITE JRMARINE.COM AND CLICK ON HP PARTS. GIVE ME A CALL RON BENDER CELL 216-390-1330