I had my port side gimble ring break in 2007, after hitting a hunk of concrete while leaving a seawall in East Chicago. The impact killed the idling engine. I raised the drive and saw a bent up prop. Lowered it back down and tried to run very slowly. There was no vibration so we went out for the poker run. We were running about 4 miles out from our home port, only 45 mph or so, when we heard a loud bang and crunch and the port engine revved up. The gimble ring had let go and the drive hung by the steering ram and tiebar. When ever I tried to drive faster than an idle with the starboard engine the port drive would swing down and it the other drive. The drive that broke was on the side that is staggered foward. The drive slipped out of the driveshaft and let no water in. (whew) My insurance bought me 2 new drives and transome assemblies