54ds 2008 gearbox and vibration

[bigc]

Hi i have a 2008 54ds and there is severe vibration above 2500 rpm. i looked at the shaft and its seems ok. i noticed that there is no flexible coupling -is that normal? What is the gearbox model number for the yammer 4jh4 the engine fitted?

thanks!

[web]

I had something similar a few years back, turned out to be the Max Prop needed servicing. Sent it in for rework, problem solve. If you have a MaxProp.
Might need cutlass bearing also. Worse problem, bent shaft if you recently hit something. Maybe a line wrapped around prop.
Hope it's simple.
Cheers