Join Date: Jun 2000
Location: CT/ Long Island Sound
Thanked 45 Times in 44 Posts
Rep Power: 17
If the vibration isn't the same in both forward and reverse, it doens't make sense that the problem would be with the shaft. If the problem is with the shaft (or zinc), the vibration should be the same in forward or reverse, depending only upon rpm. Since the vibration seems to differ according to the direction you're moving, the prop would seem to be the more likely cause. Is it a folding prop? When ours doesn't open evenly or fully, we get vibes. Marine growth or something caught on one blade could also be the issue. (Your post says you moved the boat to the permanent slip later, but doesn't specify if it was an hour, a few days or a week later. Stuff floats around in the current, or can grow.) Hope you don't have to haul again to fix it.