Originally Posted by Brooksie
Your cutless bearing would have to be worn through to rattle.
Not necessarily. We had a driveline rattle on the port side and it turned out to be a cutless bearing that had simply loosened up a bit and was starting to "walk" out of its housing on the Vee strut.
The other suggestions--- rudder, part of the steering gear, etc.--- seem logical things to check for sure.